Internet Engineering Task Force F. Baker Diffserv Working Group Cisco Systems INTERNET-DRAFT K. Chan Expires May 2001 Nortel Networks draft-ietf-diffserv-mib-06.txt A. Smith Allegro Networks November 2000 Management Information Base for the Differentiated Services Architecture Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC 2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This document is a product of the IETF's Differentiated Services Working Group. Comments should be addressed to WG's mailing list at diffserv@ietf.org. The charter for Differentiated Services may be found at http://www.ietf.org/html.charters/diffserv-charter.html Copyright (C) The Internet Society (2000). All Rights Reserved. Distribution of this memo is unlimited. Abstract This memo describes a SMIv2 MIB for a device implementing the Differentiated Services Architecture [DSARCH], described in detail by the Differentiated Services Router Informal Management Model [MODEL]. Baker, Chan, Smith Expires May 2001 [Page 1]
Internet Draft Differentiated Services MIB November 2000 1. The SNMP Management Framework The SNMP Management Framework presently consists of five major components: o An overall architecture, described in RFC 2571 [1]. o Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in RFC 1155 [2], RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in RFC 2578 [5], RFC 2579 [6] and RFC 2580 [7]. o Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [10], RFC 2572 [11] and RFC 2574 [12]. o Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13]. o A set of fundamental applications described in RFC 2573 [14] and the view-based access control mechanism described in RFC 2575 [15]. A more detailed introduction to the current SNMP Management Framework can be found in RFC 2570 [16]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine-readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine Baker, Chan, Smith Expires May 2001 [Page 2]
Internet Draft Differentiated Services MIB November 2000 readable information is not considered to change the semantics of the MIB. Baker, Chan, Smith Expires May 2001 [Page 3]
Internet Draft Differentiated Services MIB November 2000 2. Introduction 2.1. Relationship to the Diffserv Informal Management Model This MIB is designed according to the Differentiated Services Informal Management Model documented in [MODEL]. The model describes the way that ingress and egress interfaces of an 'n'-port router are modelled. It describes the configuration and management of a Diffserv interface in terms of a Traffic Conditioning Block (TCB) which contains, by definition, zero or more classifiers, meters, actions, algorithmic droppers, queues and schedulers. These elements are arranged according to the QoS policy being expressed, always in that order. Traffic may be classified; classified traffic may be metered; each stream of traffic identified by a combination of classifiers and meters may have some set of actions performed on it; it may have dropping algorithms applied and it may ultimately be stored into a queue before being scheduled out to its next destination, either onto a link or to another TCB. When the treatment for a given packet must have any of those elements repeated in a way that breaks the permitted sequence {classifier, meter, action, algorithmic dropper, queue, scheduler}, this must be modelled by cascading multiple TCBs. The MIB represents this cascade by following the "Next" attributes of the various elements. They indicate what the next step in Diffserv processing will be, whether it be a classifier, meter, action, algorithmic dropper, queue, scheduler or a decision to now forward a packet. The MIB models the individual elements that make up the TCBs. The higher level concept of a TCB is not required in the parameterization or in the linking together of the individual elements, hence it is not used in the MIB itself and only mentioned in the text for relating the MIB with the [MODEL]. The actual distinguishing of which TCB a specific element is a part of is not needed for the instructmentation of a device to support the functionalities of DiffServ, but it is useful for conceptual reasons. By not including TCB notion in its parameters, this MIB allow any grouping of elements to construct TCBs, using rules indicated by the [MODEL]. This will minimize changes to this MIB if rules in [MODEL] changes. The notion of a Data Path is used in this MIB to indicate the DiffServ processing a packet may experience. This Data Path is distinguished based on the Interface and the Direction of the flow the packet is part of. A Data Path Table Entry indicates the first of possibly multiple elements that will apply DiffServ treatment to the packet. Baker, Chan, Smith Expires May 2001 [Page 4]
Internet Draft Differentiated Services MIB November 2000 2.2. Relationship to other MIBs and Policy Management This MIB provides for direct reporting and manipulation of the most detailed functional elements described by the Diffserv Informal Management Model for management. These elements are designed with their parameterization tables separated from their data path linkage tables, allowing reuse of each table as much as possible. The data path linkage in this MIB is coupled with interface thru the use of diffServDataPathTable. The concept of "interface" is as for the InterfaceIndex/ifIndex of the IETF Interfaces MIB [IFMIB]. Other MIBs and data structure definitions for policy management mechanisms other than SNMP/SMIv2 are likely to exist in the future for the purposes of abstracting the model in other ways. In particular, abstractions in the direction of less detailed definitions of Diffserv functionality are likely e.g. some form of "Per-Hop Behaviour"-based definition involving a template of detailed object values which is applied to specific instances of objects in this MIB semi-automatically. Another possible direction of abstraction is one using a concept of "roles" (often, but not always, applied to interfaces). In this case, it may be possible to re-use the object definitions in this MIB, especially the parameterization tables. The Data Path table will help in the reuse of the data path linkage tables by having the interface specific information centralized, allowing easier mechanical replacement of ifIndex by some sort of "roleIndex". Work is ongoing in this area. 2.3. MIB Overview This MIB is structured based on the need to describe the sequential DiffServ treatments being applied to a packet, and the parameterization of these treatments. These two requirements are kept separate thru out the design of this MIB, and are full-filled using separate tables and data definitions. In this MIB, we model the ingress and egress portions of a DiffServ network device identically, making the distinction between them an index variable. Each interface then performs some or all of the following high-level functions: o Classify each packet according to some set of rules o Determine whether the packet's data stream is conforming or not conforming to its permitted rates Baker, Chan, Smith Expires May 2001 [Page 5]
Internet Draft Differentiated Services MIB November 2000 o Perform a set of resulting actions, possibly including counting the traffic, application of an appropriate drop policy and marking of the traffic with a Differentiated Services Code Point (DSCP) as defined in [DSFIELD]. o Enqueue the traffic for output in the appropriate queue, whose scheduler may shape the traffic or simply forward it with some minimum rate or maximum latency. The MIB therefore contains the following elements: Data Path Table A general extensible framework for describing the starting point of DiffServ datapaths within a single DiffServ device. Data paths defined by this table are interface and interface direction specific. Classifier and Filter Tables A general extensible framework and one example of a parameterization table - filter table (an IP Six-Tuple Multi-Field Classification Table). Meter Tables A general extensible framework and one example of a parameterization table - TBMeter table, applicable for Simple Token Bucket Meter, Average Rate Meter, Single Rate Three Color Meter, Two Rate Three Color Meter, and Sliding Window Three Color Meter. Action Tables A general extensible framework and examples of parameterization tables for Absolute Drop, Mark and Count actions. The "multiplexer", "replicator" and "null" actions described in [MODEL] are accomplished implicitly by means of the RowPointer structures of the other elements. Queue, Scheduler and Algorithmic Dropper Tables A general extensible framework for parameterizing queuing and scheduler systems. The queue measurement dependent algorithmic droppers are also described here. 3. Structure of this MIB This MIB is structured with separate tables for purpose of DiffServ data path description and DiffServ treatment parameterization of the DiffServ device. The data path description and/or the treatment parameterization tables can each be reuse independently, allowing the flexibility to maintain a common data construct for DiffServ device configuration and Baker, Chan, Smith Expires May 2001 [Page 6]
Internet Draft Differentiated Services MIB November 2000 provisioning, independent of the configuration/provisioning method used. The definitions in this MIB are intented to be reused by the DiffServ PIB and SNMPCONF working group's DiffServ Policy MIB. The treatment parameters can also be reused by other IP based technologies. For example, IP packet filtering parameters most likely can be reused by other IP based technologies. 3.1. DiffServ Data Paths This part of the MIB provide instrumentation for connecting the DiffServ Functional Elements within a single DiffServ device. Please refer to the [MODEL] for discussions on the valid sequencing and grouping of DiffServ Functional Elements. Given some basic information, e.g. ifIndex and interface direction, the first DiffServ Functional Element is determined. Subsequent DiffServ Functional Elements are provided by the "Next" pointer attribute of each entry of data path tables. Description of how this "Next" pointer is used in each table is provided in their respective DESCRIPTION clause. The data path can be redefined to allow a different level of control other than interface level control currently defined in this MIB. There is on-going work in this area, most notably the development of Policy Information Base in DiffServ and RAP working groups, and DiffServ Policy MIB in SNMPCONF working group. 3.1.1. Data Path Table Entries in the Data Path Table provide the DiffServ treatment starting points for all packets of DiffServ interfaces on this device. Notice not all interfaces on this device need to be DiffServ interfaces, hence not all entries in the ifTable need to have corresponding entries in the Data Path Table. Each entry in this table is indexed by ifIndex and the direction of the packet flow. There should be at most two entries for each interface, one for ingress and one for egress. Each entry provides the first DiffServ Functional Element each packet at a specific interface traveling a specific relative direction should experience. Notice this table is interface specific, with the use of ifIndex. As indicated in section 2.2, with some modification/extension of the Data Path Table, most of the tables and their entries are reusable by other Policy Management mechanisms. For indication of none existence of DiffServ Treatments, entries can be created with zeroDotZero in the diffServDataPathStart attribute to indicate this explicitly. The none existence of DiffServ Treatment can also be indicated implicitly by not having the entry at all. The explicit/implicit selection is up to the implementation. This means allow normal IP device processing when zeroDotZero is used in the diffServDataPathStart attribute, or when the entry does not exist. Normal IP device processing will depend on the Baker, Chan, Smith Expires May 2001 [Page 7]
Internet Draft Differentiated Services MIB November 2000 device, for example, this can be forwarding the packet. 3.2. Classifiers The classifier, classifier element, and filter tables determine how traffic is sorted out. They identify separable classes of traffic, by reference to an appropriate filter, which may select anything from an individual micro-flow to aggregates identified by DSCP. The classification is used to send these separate streams to appropriate Meter, Action, Queue, Scheduler and Algorithmic Dropper elements. For example, to indicate a multi-stage meter, sub-classes of traffic may be sent to different meter stages: e.g. in an implementation of the Assured Forwarding (AF) PHB [AF-PHB], AF11 traffic might be sent to the first meter, AF12 traffic might be sent to the second and AF13 traffic sent to the second meter stage's out-of-profile action. The concept of a classifier is the same as described in [MODEL]. The structure of the classifier and classifier element tables, is the same as the classifier described in [MODEL]. Within each classifier, it must not be important in which order the tests are made. This is to facilitate optimized implementations such as index trees. Order is present only to resolve ambiguity, by use of "order" here and "precedence" in [MODEL]. Filter with higher values of order are compared first; the order of tests for entries of the same order is unimportant. A datapath may consist of more than one classifier. There may be overlap of filter specification between filters of different classifiers. The first classifier functional datapath element encountered, as determined by the sequencing of diffserv functional datapath elements, will be used first. An important form of classification is "everything else": the final stage of the classifier i.e. the one with the lowest order, must be "complete" since the result of an incomplete classifier is not necessarily deterministic - see [MODEL] section 4.1.2. The definition of the actual filter to be used by the classifier is referenced via a StaticRowPointer: this enables the use of any sort of filter table that one might wish to design, standard or proprietary. The filter table may be, but does not need to be, defined in this MIB module. The classifiers specified here are at the interface level, they may be derived from some more general policies e.g. something based on interface roles, but such discussion is outside the scope of this Baker, Chan, Smith Expires May 2001 [Page 8]
Internet Draft Differentiated Services MIB November 2000 document. See e.g. [POLTERM] section 4 for a discussion of Roles. 3.2.1. Classifier Table Classifiers are organized by entries of the Classifier Table. With each entry corresponds to a single Classifier. It is the entries in the Classifier Table that get linked from the upstream diffserv functional datapath element, i.e. an entry in diffServDataPathTable. A data path may consist of more than one Classifier, the order the classification processes aplies to the traffic is the same as the order the classifier table entries are linked in the data path. 3.2.2. Classifier Element Table While the Classifier Table entries handles the input side of the Classifier, the Classifier Element Table enumerates each branch of the fan-out of a Classifier, associating each fan-out branch with a Filter for discriminating the traffic for that branch. Each Classifier Element table entry is part of a Classifier, indicated by diffServClfrElementClfrId. 3.2.3. Filter Table - IP Six-Tuple Classifier Table This MIB includes one Filter Table, a definition for an IP Six-Tuple Classifier, used for IP traffic classification. Entries in this filter table are referenced from the StaticRowPointer diffServClfrElementSpecific attributes of classifier element table entries. For example, a Behavior Aggregate (BA) Classifier, acting only on DSCPs, is a simple form of the IP Six-Tuple Classifier. It is represented by having the diffServSixTupleClfrDscp attribute set to the desired DSCP and all other classification attributes set to match-all, their default settings. Each entry in the IP Six-Tuple Classifier Table defines a single filter. The textual convention of InetAddress [INETADDR] is used for both IPv4 and IPv6 addressing. The use of IP Six-Tuple Classifiers is discussed in [DSARCH] and abstract examples of how they might be configured are provided in [MODEL]. 3.3. Meters A meter, according to [MODEL] section 5, measures the rate at which packets making up a stream of traffic pass it, compares this rate to some set of thresholds and produces some number (two or more) of Baker, Chan, Smith Expires May 2001 [Page 9]
Internet Draft Differentiated Services MIB November 2000 potential results. A given packet is said to "conform" to the meter if, at the time that the packet is being looked at, the stream appears to be within the meter's profile. MIB syntax makes it easiest to define this as a sequence of one or more cascaded pass/fail tests, modeled here as if-then-else constructs. It is important to understand that this way of modelling does not imply anything about the implementation being "sequential": multi-rate/multi-profile meters e.g. those designed to support [SRTCM], [TRTCM], or [TSWTCM] can still be modelled this way even if they, of necessity, share information between the stages: the stages are introduced merely as a notational convenience in order to simplify the MIB structure. 3.3.1. Meter Table The generic meter table is used as a base for all more specific forms of meter. The definition of parameters specific to the type of meter used is referenced via a pointer to a table containing those specifics. This enables the use of any sort of specific meter table that one might wish to design, standard or proprietary. The specific meter table may be, but does not need to be, defined in this MIB module. 3.3.2. Token-Bucket Meter Table This is included as an example of a common type of meter. Entries in this table are referenced from the StaticRowPointer diffServMeterSpecific attributes of meter table entries. The parameters are represented by a rate diffServTBMeterRate, a burst size diffServTBMeterBurstSize, and an interval diffServTBMeterInterval. How these parameters are used depends on the type of meter being parameterized, this is provided by the diffServTBMeterType attribute. Additional meter parameterization tables can be defined in other MIBs when necessary. 3.4. Actions Actions include "no action", "mark the traffic with a DSCP", "drop the traffic" or "count it". Other tasks such as "shape the traffic" or "drop based on some algorithm" are handled elsewhere as queueing mechanisms, rather than actions, consistent with [MODEL]. The "multiplexer", "replicator" and "null" actions described in [MODEL] are accomplished implicitly by means of the RowPointer structures of the other elements. This MIB uses the Action Table diffServActionTable to organize one Action's relationship with the element(s) before and after it. It allows Actions to be cascaded to enable multiple Actions be applied to a single traffic stream by using each entry's diffServActionNext attribute. The diffServActionNext attribute of the last action entry in the chain Baker, Chan, Smith Expires May 2001 [Page 10]
Internet Draft Differentiated Services MIB November 2000 points to the next element in the TCB, if any, e.g. a Queueing element. It may also point at a next TCB. The parameters needed for each Action element will depend on the type of Action to be taken. Hence there are specific Action Tables for all the different Action types. This flexibility allows additional Actions be specified in future revisions of this MIB, or in other MIBs and also allows for the use of proprietary Actions without impact on those defined here. 3.4.1. DSCP Mark Action Table This Action is applied to traffic in order to mark it with a Diffserv Codepoint (DSCP) value, specified in the diffServDscpMarkActTable. Other marking actions might be specified elsewhere - these are outside the scope of this MIB. 3.4.2. Count Action Table Count Actions are used to count the traffic passing along a particular path through the model. If specified, they are likely to be placed first, before other types of Action. For example, when both a Count and an Absolute Dropper Action are specified, the Count Action needs to count the traffic stream before any traffic gets dropped. Note that there are counters contained directly in Algorithmic Dropper elements to indicate the amount of traffic dropped by those elements. Notice counter support is implementation specific. Where within a data path and for what purpose a counter exists can be different between implementations. It is advisable to have at least one counter within a data path and have different counts derived from DiffServ counters and counters defined in other MIBs. Counters are arranged in a single table but with separate conformance statements for low-speed and high-speed interfaces, consistent with [IFMIB]. 3.4.3. Absolute Drop Action This action just silently discards all traffic presented to it, without counting it. This action has no additional parameters and so is represented only within diffServActionType without its specific table. 3.5. Queueing Elements These include Algorithmic Droppers, Queues and Schedulers which are all inter-related in their use of queueing techniques. Baker, Chan, Smith Expires May 2001 [Page 11]
Internet Draft Differentiated Services MIB November 2000 3.5.1. Algorithmic Dropper Table Algorithmic Droppers have a close relationship with queueing: they are represented in this MIB by entries in an Algorithmic Dropper Table. Entries contain a diffServAlgDropNext attribute which indicates to which queue they sink their traffic. An Algorithmic Dropper is assumed to operate indiscriminately on all packets that are presented at its input. If it is necessary to perform additional classification on the stream then a separate TCB must be introduced at this point: Classifier elements here can then distinguish the different types of traffic on which dropping is to act and the treatment for each type is described by a separate diffServAlgDropEntry. Algorithmic Droppers may also contain a pointer to specific detail of the drop algorithm, diffServAlgDropSpecific. This MIB defines the detail for three drop algorithms: Tail Drop, Head Drop and Random Drop; other algorithms are outside the scope of this MIB module but the general framework is intended to allow for their inclusion via other MIB modules. One generally-applicable parameter of a dropper is the specification of a queue-depth threshold at which some drop action is to start. This is represented in this MIB, as a base attribute, diffServAlgDropQThreshold, of the Algorithmic Dropper entry. The queue for which depth is to be compared and the depth threshold to compare against, is specified with diffServAlgDropQMeasure. o A Tail Dropper requires the specification of a maximum queue depth threshold: when the queue pointed at by diffServAlgDropQMeasure reaches that depth threshold, diffServAlgDropQThresh, any new traffic arriving at the dropper is discarded. This algorithm uses only parameters that are part of the diffServAlgDropEntry. o A Head Dropper requires the specification of a maximum queue depth threshold: when the queue pointed at by diffServAlgDropQMeasure reaches that depth threshold, diffServAlgDropQThresh, traffic currently at the head of the queue is discarded. This algorithm uses only parameters that are part of the diffServAlgDropEntry. o Random Droppers are recommended as a way to control congestion, in [QUEUEMGMT] and called for in the [AF-PHB]. Various implementations exist, which agree on marking or dropping just enough traffic to communicate with TCP-like protocols about congestion avoidance, but differ markedly on their specific parameters. This MIB attempts to offer a minimal set of controls for any random dropper, but expects that vendors will augment the table with additional controls and Baker, Chan, Smith Expires May 2001 [Page 12]
Internet Draft Differentiated Services MIB November 2000 status in accordance with their implementation. This algorithm requires additional parameters on top of those in diffServAlgDropEntry: these are discussed below. 3.5.2. Random Dropper Table One example of a random dropper is a RED-like dropper. An example of the representation chosen in this MIB for this element is shown in Figure 1. Random droppers often have their drop probability function described as a plot of drop probability (P) against averaged queue length (Q). (Qmin,Pmin) then defines the start of the characteristic plot. Normally Pmin=0, meaning with average queue length below Qmin, there will be no drops. (Qmax,Pmax) defines a "knee" on the plot, after which point the drop probability become more progressive (greater slope). (Qclip,1) defines the queue length at which all packets will be dropped. Notice this is different from Tail Drop because this uses an averaged queue length. although it is possible for Qclip = Qmax. In the MIB module, diffServRandomDropMinThreshBytes and diffServRandomDropMinThreshPkts represent Qmin. diffServRandomDropMaxThreshBytes and diffServRandomDropMaxThreshPkts represent Qmax. diffServRandomDropInvProbMax represents Pmax. This MIB does not represent Pmin (assumed to be zero unless otherwise represented) or Qclip (assumed to be Qmax unless otherwise represented). +-------------+ +-----------+ --->| Next -----+--+-->| Next --+------> to Scheduler | Thresh=100k | | | Min=none | | Measure ----+--+ | Max=none | | Type=random | | Pri=10 | | Specific ---+--+ | Type=fifo | +-------------+ | +-----------+ AlgDrop.3 | Queue.4 | | +--------------+ +-->| Minthresh=10k| | Maxthresh=80k| | Weight=1/16 | | ProbMax= 0.5 | +--------------+ RandomDrop.3 Figure 1: Example Use of the RandomDropTable for Random Droppers Baker, Chan, Smith Expires May 2001 [Page 13]
Internet Draft Differentiated Services MIB November 2000 Each random dropper specification is associated with a queue. This allows multiple drop processes (of same or different types) be associated with the same queue, as different PHB implementations may require. This also allows for sequences of multiple droppers if necessary. The calculation of a smoothed queue length may also have an important bearing on the behaviour of the dropper: parameters may include the sampling rate and the weight of each sample. The performance may be very sensitive to the values of these parameters and a wide range of possible values may be required due to a wide range of link speeds. Most algorithms include a sample weight, represented here by diffServRandomDropInvWeight. The availability of diffServRandomDropSamplingRate as readable is important, the information provided by Sampling Rate is essential to the configuration of diffServRandomDropInvWeight. Having Sampling Rate be configurable is also helpful, as line speed increases, the ability to have queue sampling be less frequent than packet arrival is needed. Note however that there is ongoing research on this topic, see e.g. [ACTQMGMT] and [AQMROUTER]. Additional parameters may be added in an enterprise MIB module, e.g. by using AUGMENTS on this table, to handle aspects of random drop algorithms that are not standardised here. NOTE: Deterministic Droppers can be viewed as a special case of Random Droppers with the drop probability restricted to 0 and 1. Hence Deterministic Droppers might be described by a Random Dropper with Pmin = 0, Pmax = 1, Qmin = Qmax = Qclip, the averaged queue length at which dropping occurs. 3.5.3. Queues and Schedulers The Queue Table models simple FIFO queues, as described in [MODEL] section 7.1.1. The Scheduler Table allows flexibility in constructing both simple and somewhat more complex queueing hierarchies from those queues. Of course, since TCBs can be cascaded multiple times on an interface, even more complex hierarchies can be constructed that way also. Queue Table entries are pointed at by the "next" attributes of the upstream elements e.g. diffServMeterSucceedNext. Note that multiple upstream elements may direct their traffic to the same Queue Table entry. For example, the Assured Forwarding PHB suggests that all traffic marked AF11, AF12 or AF13 be placed in the same queue, after metering, without reordering. This would be represented by having the diffServMeterSucceedNext of each upstream meter point at the same entry Baker, Chan, Smith Expires May 2001 [Page 14]
Internet Draft Differentiated Services MIB November 2000 in the Queue Table. Notice Queue Table and Scheduler Table entries are for data path description, they both uses Scheduler Parameterization Table entries for diffserv treatment parameterization. Queue Table entries specify the scheduler it wants service from by use of its Next pointer. Each Scheduler Table entry represents the algorithm in use for servicing the one or more queues that feed it. The [MODEL] section 7.1.2 describes a scheduler with multiple inputs: this is represented in the MIB by having the scheduling parameters be associated with each input. In this way, sets of Queues can be grouped together as inputs to the same Scheduler. This table serves to represent the example scheduler described in the [MODEL]. More complex queuing and scheduling structures are possible using the tables defined in this MIB. When necessary, more complex constructs may be created outside of this MIB. Scheduler Parameter Table entries are used to parameterized each input that feeds into a scheduler. The inputs can be a mixture of Queue Table and Scheduler Table entries. Scheduler Parameter Table entries can be used/reused by one or more Queue and/or Scheduler Table entries. For representing a Strict Priority scheduler, each scheduler input is assigned a priority with respect to all the other inputs feeding the same scheduler, with default values for the other parameters. A higher-priority input will be serviced first over a lower-priority input, assuming that all guarantees have already been met. For weighted scheduling method e.g. WFQ, WRR, the "weight" of a given scheduler input is represented with a Minimum Service Rate leaky-bucket profile which provides guaranteed bandwidth to that input, if required. This is represented, as were token-bucket meters, by a rate diffServSchdParamMinRateAbs and a burst size diffServSchdParamBurstSize. The rate may, alternatively, be represented by a relative value, as a fraction of the interface's current line rate, diffServSchdParamMinRateRel to assist in cases where line rates are variable or where a higher-level policy might be expressed in terms of fractions of network resources. The two rate parameters are inter- related and changes in one may be reflected in the other. For weighted scheduling methods, one can say loosely, that WRR focuses on meeting bandwidth sharing, without concern for relative delay amongst the queues; where WFQ control both queue service order and amount of traffic serviced, providing meeting bandwidth sharing and relative delay ordering amongst the queues. Baker, Chan, Smith Expires May 2001 [Page 15]
Internet Draft Differentiated Services MIB November 2000 An input may also be capable of acting as a non-work-conserving [MODEL] traffic shaper: this is done by defining a Maximum Service Rate leaky- bucket profile in order to limit the scheduler bandwidth available to that input. This is represented, similarly to the minimum rate, by a rate diffServSchdParamMaxRateAbs and a burst size diffServSchdParamBurstSize. The rate may, alternatively, be represented by a relative value, as a fraction of the interface's current line rate, diffServSchdParamMaxRateRel. Other types of priority and weighted scheduling methods can be defined using existing parameters in diffServSchdParamEntry. Notice diffServSchedulerMethod uses OBJECT IDENTIFIER syntax, with the different types of scheduling methods defined as OBJECT-IDENTITY. When new scheduling methods need to be defined, and no new scheduling parameters are needed, just need to add a new OBJECT-IDENTITY definition in some other MIB, with description of how the existing scheduling parameters will be used by the new scheduling method. If the existing scheduling parameters are not sufficient, new scheduling parameter tables can be defined in some other MIB. Notice hierarchical schedulers can be parameterized using this MIB by having Scheduler Table entries feeds into Scheduler Table entry. 4. MIB Usage Example This section provides some examples on how the different table entries of this MIB may be used together for a DiffServ Device, with the usage of each individual attribute be defined within the MIB module itself. For the figures, all the MIB table entry and attribute names assumes to have "diffServ" as their first common initial part of name, with the table entry name assumed to be their second common initial part of name. "0.0" is being used to mean zeroDotZero. And for Scheduler Method "= X" means "using the OID of diffServSchedulerX". 4.1. Model's Example As an example, when this MIB's structures are used for the hypothetical configuration in [MODEL] section 8.1, the result is shown in Figure 2, 3, and 4. The parameterization table entries' values are not specified in detail here, they can be obtained from [MODEL] section 8.1. This example has been explained in sufficient detail in [MODEL] section 8.1, please use that as a reference. Baker, Chan, Smith Expires May 2001 [Page 16]
Internet Draft Differentiated Services MIB November 2000 +---------------------+ +------------------------> Q_EF |DataPath | | | ifIndex=1 | | +--------------+ | IfDirection=Ingress | +------+ | +--->|Action | | Start --------------+--->|Clfr | | | | Id=EF2 | +---------------------+ | Id=1 | | | | Next=0.0 | +------+ | | | Specific=0.0 | | | | Type=AbsDrop | | | +--------------+ | | | +-------------------+ | | +------------+ +--------------+ | +-----------+ | |ClfrElement | +-->|Meter | | +->|Action | | | Id=EF | | | Id=EF | | | | Id=EF1 | | | ClfrId=1 | | | SucceedNext -+-+ | | Next -----+----+ | Order=NA | | | FailNext ----+----+ | Specific -+--+ | Next ------+--+ | Specific -+ | | Type=Spcf | | | Specific --+-+ +-----------+--+ +-----------+ | +------------+ | | | | | +-------+ | | | | +--------+ | +---------+ | +--------------+ +-->|FilterEF| +-->|TBMeterEF| +->|CountActEFDrop| +--------+ +---------+ +--------------+ +------------+ +----------+ +--------------+ |ClfrElement | +-->|Action | +-->|AlgDrop | | Id=AF11 | | | Id=AF11 | | | Id=AF11 | | ClfrId=1 | | | Next ----+--+ | Type=tailDrop| | Order=NA | | | Specific +-+ | Next --------+--+-> Q_AF11 | Next ------+--+ | Type=Spcf| | | QMeasure ----+--+ | Specific --+-+ +----------+ | | QThreshold | +------------+ | | | Specific=0.0 | | | +--------------+ | | | +----------+ | +------------+ +->|FilterAF11| +->|CountActAF11| +----------+ +------------+ Figure 2: Example from Model Section 8.1 part 1 Baker, Chan, Smith Expires May 2001 [Page 17]
Internet Draft Differentiated Services MIB November 2000 +------------+ +--------------+ +-------------+ |ClfrElement | +-->|Meter | +-->|Action | | Id=AF21 | | | Id=AF21 | | | Id=AF21S | | ClfrId=1 | | | SucceedNext -+--+ | Next -------+----> Q_AF21 | Order=NA | | | FailNext + | | Specific -+ | | Next ------+--+ | Specific --+ | | Type=Spcf | | | Specific --+-+ +----------+-+-+ +-----------+-+ +------------+ | | | | | | | +---+ | | | | | +----------+ | | +-----------+ | +-------------+ +->|FilterAF21| | +->|TBMeterAF21| +->|CountActAF21S| +----------+ | +-----------+ +-------------+ | +--------------+ | | +-----------+ +-----------+ +-->|Action | +-->|Action | | Id=AF21F1 | | | Id=AF21F2 | | Next -----+--+ | Next -----+------> Q_BE | Specific -+-+ | Specific -+-+ | Type=Spcf | | | Type=Spcf | | +-----------+ | +-----------+ | | | | +-------------+ | +-------------+ +->|CountActAF21F| +->|DscpMarkActBE| +-------------+ +-------------+ +------------+ |ClfrElement | +-----------------------------------------> Q_BE | Id=WildCard| | | ClfrId=1 | | | Order=NA | | | Next ------+--+ +--------------+ | Specific --+------>|FilterMatchAll| +------------+ +--------------+ Figure 3: Example from Model Section 8.1 part 2 Baker, Chan, Smith Expires May 2001 [Page 18]
Internet Draft Differentiated Services MIB November 2000 +-------------+ Q_EF--->|Q | | Id=EF +--+--------------------------+ | Next ----+ | +-----------+ | | SchdParam --+-->|SchdParamEF| | +-------------+ +-----------+ | | +-------------+ +----------------+ | +----------------+ Q_AF11->|Q | +->|Scheduler | +->|Scheduler | | Id=AF11 | | | Id=AF11Shaper | | | Id=DiffServ | | Next -------+---+ | Next ----------+--+ | Next=0.0 | | SchdParam --+-+ | Method=Shaping | | | Method=Priority| +-------------+ | | SchdParam -+ | | | SchdParam=0.0 | | +------------+---+ | +----------------+ +---------------+ | | | +------------+ | | +--------------+ | +-------------+ | +->|SchdParamAF11S| +->|SchdParamAF11| | +--------------+ +-------------+ | | +-------------+ | Q_AF21->|Q | | | Id=AF21 +--+--------------------------+ | Next ----+ | +-------------+ | | SchdParam --+-->|SchdParamAF21| | +-------------+ +-------------+ | | +-------------+ | Q_BE--->|Q | | | Id=BE +--+--------------------------+ | Next ----+ | +-----------+ | SchdParam --+-->|SchdParamBE| +-------------+ +-----------+ Figure 4: Example from Model Section 8.1 part 3 4.2. Additional Data Path Example 4.2.1. Data Path and Classifier Example Discussion The example in Figure 5 shows a single DataPathTable entry feeding into a single Classifier entry, with three ClfrElement and Filter Table entry pairs belonging to this Classifier 1. Notice the three Filters used here must completely classify all the traffic presented to this data path. Baker, Chan, Smith Expires May 2001 [Page 19]
Internet Draft Differentiated Services MIB November 2000 +---------------------+ |DataPath | | ifIndex=1 | | IfDirection=Ingress | +------+ | Start --------------+--->|Clfr | +---------------------+ | Id=1 | +------+ +------------+ +--------------+ +-----------+ |ClfrElement | +-->|Meter | +-->|Action | | Id=101 | | | Id=101 | | | Id=101 | | ClfrId=1 | | | SucceedNext -+--+ | Next -----+---->... | Order=NA | | | FailNext ----+->... | Specific -+-+ | Next ------+--+ | Specific -+ | | Type=Spcf | | | Specific --+-+ +-----------+--+ +-----------+ | +------------+ | | +-------+ | +-------+ | +--------+ | +---------+ +-->|Filter1| +-->|TBMeter1| +-->|CountAct1| +-------+ +--------+ +---------+ +------------+ +--------------+ +-----------+ |ClfrElement | +-->|Meter | +-->|Action | | Id=102 | | | Id=102 | | | Id=102 | | ClfrId=1 | | | SucceedNext -+--+ | Next -----+---->... | Order=NA | | | FailNext ----+->... | Specific -+-+ | Next ------+--+ | Specific -+ | | Type=Spcf | | | Specific --+-+ +-----------+--+ +-----------+ | +------------+ | | +-------+ | +-------+ | +--------+ | +---------+ +-->|Filter2| +-->|TBMeter2| +-->|CountAct2| +-------+ +--------+ +---------+ +------------+ +--------------+ +-----------+ |ClfrElement | +-->|Meter | +-->|Action | | Id=103 | | | Id=103 | | | Id=103 | | ClfrId=1 | | | SucceedNext -+--+ | Next -----+---->... | Order=NA | | | FailNext ----+->... | Specific -+-+ | Next ------+--+ | Specific -+ | | Type=Spcf | | | Specific --+-+ +-----------+--+ +-----------+ | +------------+ | | +-------+ | +-------+ | +--------+ | +---------+ +-->|Filter3| +-->|TBMeter3| +-->|CountAct3| +-------+ +--------+ +---------+ Figure 5: Additional Data Path Example Part 1 Baker, Chan, Smith Expires May 2001 [Page 20]
Internet Draft Differentiated Services MIB November 2000 +-------------+ +-----------------+ +----------------+ ---->|Q | +->|Scheduler | +->|Scheduler | | Id=EF | | | Id=DiffServ | | | Id=Shaping | | Next -------+---+ | Next -----------+--+ | Next=0.0 | | SchdParam -+| | | Method=Priority | | Method=Shaping | +------------++ | | SchdParam -+ | | SchdParam=0.0 | | | +------------+----+ +----------------+ +------------+ | | | | +------------+ | +-----------+ | | +->|SchdParamEF| | | +----------------+ +-----------+ | +->|SchdParamShaping| | +----------------+ | +-----------------------------------------+ | +----------------+ +-------------+ | --->|AlgDrop | +->|Q | | | Id=AF11 | | | Id=AF1X | +-------------+ | | Type=randomDrop| | | Next -------+--->|Scheduler | | | Next ----------+-+--+ | SchdParam -+| | Id=AF | | | QMeasure ------+-+ | +------------++ | Next -------+--+ | QThreshold | | | | Method=WFQ | | Specific -+ | | +------------+ | SchdParam --+--+ +-----------+----+ | | +-------------+ | | | | +-------------+ | +-----------+ | +->|SchdParamAF1X| +----------------+ | +--------------+ | +-------------+ | +->|RandomDropAF11| | | +-----------+ +--------------+ | +->|SchdParamAF| | +-----------+ +----------------+ | --->|AlgDrop | | | Id=AF12 | | | Type=randomDrop| | | Next ----------+-+--+ | QMeasure ------+-+ | QThreshold | | Specific -+ | +-----------+----+ | +-----------+ | +--------------+ +->|RandomDropAF12| +--------------+ Figure 6: Additional Data Path Example Part 2 Baker, Chan, Smith Expires May 2001 [Page 21]
Internet Draft Differentiated Services MIB November 2000 Another level of classification can be defined that follows the Action functional datapath elements in Figure 5. This second level of classifiers and their subsequent functional datapath elements would be considered as in another TCB. This multi-level classification allow the construction of traffic seperations like: if (dept1) then take dept1-action { if (appl1) then take dept1-appl1-action. if (appl2) then take dept1-appl2-action. if (appl3) then take dept1-appl3-action. } if (dept2) then take dept2-action { if (appl1) then take dept2-appl1-action. if (appl2) then take dept2-appl2-action. if (appl3) then take dept2-appl3-action. } if (dept3) then take dept3-action { if (appl1) then take dept3-appl1-action. if (appl2) then take dept3-appl2-action. if (appl3) then take dept3-appl3-action. } Minimumly, the filters for appl1, appl2, appl3 may be reused for the above setup. 4.2.2. Meter and Action Example Discussion A simple Meter that can be parameterized by a single TBMeter entry is shown here. For Metering types that require mutliple TBMeter entries for parameterization, a second level Meter and TBMeter table entries may be used. For example, for trTCM, with the first level TBMeter entry used for Peak Information Token Bucket, the first level SucceedNext points to the second level Meter entry, with second level TBMeter entry used for Committed Information Token Bucket. Notice the CountAct Action is shown in Figure 5. This is purposely done to indicate all datapaths should have at least one CountAct Action. Other actions can be pointed to by the Next pointer of the CountAct action, like DscpMarkAct action. Baker, Chan, Smith Expires May 2001 [Page 22]
Internet Draft Differentiated Services MIB November 2000 4.2.3. Queue and Scheduler Example Discussion Example in Figure 6 shows three classified input traffic streams, EF, AF11, and AF12, feeding into their respective queue and algorithmic droppers. After their respective dropping process, the AF traffic streams feed into the same queue, QAF1X. A Scheduler, AF, is shown in Figure 6, as the sink for AF1X queue traffic, servicing AF1X queue with scheduling parameters indicated by SchdParamAF1X. This scheduler is used to service traffic from AF1X, AF2X, AF3X queues using weighted fair queueing method. The AF2X and AF3X queues are not shown in Figure 6, they can be very much like AF1X queue setup. Another traffic stream, EF, is handled by the EF queue. Scheduler DiffServ services output of EF queue using SchdParamEF, and output of AF scheduler using SchdParamAF, with Priority Queue scheduling method. Notice all the diffserv traffic may go out on a link with traffic shaping. The traffic shaping can be parameterize using the Shaping Scheduler in Figure 6. For shaping, the diffServSchdParamMaxRate attributes should be used. The Shaping Scheduler is indicated as the last diffserv functional element of this data path by using its Next pointer with value of zeroDotZero. 5. Conventions used in this MIB 5.1. The use of RowPointer RowPointer is a textual convention used to identify a conceptual row in an SNMP Table by pointing to one of its objects. In this MIB, it is used to indicate succession, for pointing to data path linkage table entries. For succession, it answers the question "what happens next?". Rather than presume that the next table must be as specified in the conceptual model [MODEL] and providing its index, the RowPointer takes you to the MIB row representing that thing. In the diffServMeterTable, for example, the diffServMeterFailNext RowPointer might take you to another meter, while the diffServMeterSucceedNext RowPointer would take you to an action. NOTE -- the RowPointer construct is used to build the TCBs described in [MODEL]: this MIB does not model TCBs directly - it operates at a lower level of abstraction using only individual elements, connected in succession by RowPointers. Therefore, the concept of TCBs enclosing individual functional datapath elements Baker, Chan, Smith Expires May 2001 [Page 23]
Internet Draft Differentiated Services MIB November 2000 is not applicable to this MIB, although such a concept may be employed by management tools that use this MIB. It is possible that a path through a device following a set of RowPointers is indeterminate i.e. it ends in a dangling RowPointer. Guidance is provided in the MIB module's DESCRIPTION-clause for each of the linkage attribute. In general, for both zeroDotZero and dangling RowPointer, it is assumed the data path ends and the traffic should be given to the none-diffserv part of the device. Any variation from this usage is indicated by the attribute affected. 5.2. The use of StaticRowPointer StaticRowPointer, like RowPointer, is a textual convention used to identify a conceptual row in an SNMP Table by pointing to one of its objects. In this MIB, it is used to indicate parameterization, for pointing to parameterization table entries. For indirection as in the diffServClfrElementTable, the idea is to allow other MIBs, including proprietary ones, to define new and arcane filters - MAC headers, IPv4 and IPv6 headers, BGP Communities and all sorts of other things - whilst still utilising the structures of this MIB. This is a form of class inheritance (in "object oriented" language): it allows base object definitions ("classes") to be extended in proprietary or standard ways, in the future, by other documents. StaticRowPointer also clearly indicate the identified conceptual row's content does not change, hence they can be simultaneously used, pointed to, by more than one data path linkage table entries. The identification of StaticRowPointer allows higher level policy mechanisms to take advantage of this characteristic. 5.3. Conceptual row creation and deletion A number of conceptual tables defined in this MIB use as an index an arbitrary integer value, unique across the scope of the agent. In order to help with multi-manager row-creation problems, a mechanism must be provided to allow a manager to obtain unique values for such an index and to ensure that, when used, the manager knows whether it got what it wanted or not. Typically, such a table has an associated NextFree variable e.g. diffServClfrNextFree which provides a suitable value for the index of the next row to be created e.g. diffServClfrId. A special value, 0, is used to indicate that no more entries can be created by the agent. The table also has a columnar Status attribute with RowStatus syntax [6]. Baker, Chan, Smith Expires May 2001 [Page 24]
Internet Draft Differentiated Services MIB November 2000 If a manager attempts to create a conceptual row in the table (by a SET operation that contains a varbind setting the Status to a value of either createAndGo or createAndWait) and if the agent has sufficient resources and has no other conceptual row with the same indices, the agent will create the row and return success. If the agent has insufficient resources or such a row is already existent then it returns an error. A manager must be prepared to try again in such circumstances, probably by re-reading the NextFree to obtain a new index value in case a second manager had got in between the first manager's read of the NextFree value and the first manager's row-creation attempt. The use of RowStatus is covered in more detail in [6]. 6. Extending this MIB With the structures of this MIB divided into data path linkage tables and parameterization tables, and with the use of RowPointer and StaticRowPointer, new data path linkage and parameterization tables can be defined in other MIB modules, and used with tables defined in this MIB. This MIB does not limit on the type of entries its RowPointer attributes can point to, hence new functional data path elements can be defined in other MIBs and integrated with functional data path elements of this MIB. For example, new Action functional data path element can be defined for Traffic Engineering and be integrated with DiffServ functional data path elements, possibly used within the same data path sharing the same classifiers and meters. It is more likely that new parameterization tables will be created in other MIBs as new methods or proprietary methods get deployed for existing diffserv functional data path elements. For example, different kinds of filters can be defined by using new filter parameterization tables. New scheduling methods can be deployed by defining new scheduling method OIDs and new scheduling parameter tables. Notice both new data path linkage tables and parameterization tables can be added without needing to change this MIB document or affect existing tables and their usage. Baker, Chan, Smith Expires May 2001 [Page 25]
Internet Draft Differentiated Services MIB November 2000 7. MIB Definition DIFF-SERV-MIB DEFINITIONS ::= BEGIN IMPORTS Integer32, Unsigned32, Counter32, Counter64, MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY, zeroDotZero, mib-2 FROM SNMPv2-SMI TEXTUAL-CONVENTION, RowStatus, RowPointer, TimeStamp FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF ifIndex FROM IF-MIB InetAddressType, InetAddress FROM INET-ADDRESS-MIB BurstSize FROM INTEGRATED-SERVICES-MIB; diffServMib MODULE-IDENTITY LAST-UPDATED "200011190000Z" ORGANIZATION "IETF Diffserv WG" CONTACT-INFO " Fred Baker Cisco Systems 519 Lado Drive Santa Barbara, CA 93111, USA E-mail: fred@cisco.com Kwok Ho Chan Nortel Networks 600 Technology Park Drive Billerica, MA 01821, USA E-mail: khchan@nortelnetworks.com Andrew Smith Allegro Networks 6399 San Ignacio Ave San Jose, CA 95119, USA E-mail: andrew@allegronetworks.com" Baker, Chan, Smith Expires May 2001 [Page 26]
Internet Draft Differentiated Services MIB November 2000 DESCRIPTION "This MIB defines the objects necessary to manage a device that uses the Differentiated Services Archi- tecture described in RFC 2475 and the Informal Management Model for DiffServ Routers in draft-ietf- diffserv-model-05.txt." REVISION "200011190000Z" DESCRIPTION "Initial version, published as RFC xxxx." ::= { mib-2 12345 } -- anybody who uses this unassigned -- number deserves the wrath of IANA diffServMIBObjects OBJECT IDENTIFIER ::= { diffServMib 1 } diffServMIBConformance OBJECT IDENTIFIER ::= { diffServMib 2 } -- These textual conventions have no effect on either the syntax -- nor the semantics of any managed object. Objects defined -- using this convention are always encoded by means of the -- rules that define their primitive type. Dscp ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "The IP header Diffserv Code-Point that may be used for discriminating or marking a traffic stream. The value -1 ( 4294967295 for Integer32 ) is used to indicate a wildcard i.e. any value." SYNTAX Integer32 (4294967295 | 0..63) SixTupleClfrL4Port ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "A value indicating a Layer-4 protocol port number." SYNTAX Unsigned32 (0..65535) IfDirection ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION Baker, Chan, Smith Expires May 2001 [Page 27]
Internet Draft Differentiated Services MIB November 2000 "Specifies a direction of data travel on an inter- face. 'inbound' traffic is operated on during recep- tion from the interface, while 'outbound' traffic is operated on prior to transmission on the interface." SYNTAX INTEGER { inbound(1), -- ingress interface outbound(2) -- egress interface } -- The following textual convention, StaticRowPointer, -- is similiar to the RowPointer textual convention, -- but embody additional semantics to indicate whether -- a single instance of the target object can be pointed -- to by more than one parent objects. -- This textual convention allows a clearer definition -- of parameterization table entries, as compared to -- datapath linking table entries. -- Objects pointed to by StaticRowPointers, parameterization -- table entries, can be reused by one or more data path -- functional elements in one or more TCBs, belonging to one -- or more data paths. -- This textual convention also allow easier reuse of -- data definitions in this MIB by higher level configuration -- and provisioning mechanisms. StaticRowPointer ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "Like a RowPointer, this textual convention represents a pointer to a conceptual row. The value is the name of the instance of the first accessible columnar object in the conceptual row. The additional semantics of this textual convention, relative to RowPointer, are related to the object the pointer is pointing to. The pointed-to object may have more than one parent object pointing to it, indicating the pointed-to object can be shared by one or more parent objects. This additional semantics facilitates the creation of instance-specific objects by cloning, used by higher level configuration/provisioning mechanisms. The objects being cloned may either be special ones that express configuration information at the Baker, Chan, Smith Expires May 2001 [Page 28]
Internet Draft Differentiated Services MIB November 2000 implementation-specific level, or simply instance- specific ones that already exist at the time the cloning is done. When an object with the syntax Sta- ticRowPointer is cloned, the StaticRowPointer in the newly cloned object is set to point to the same con- ceptual row that the StaticRowPointer in the cloned- from object pointed to. The cloning operations may be accomplished either with the script-based technique defined by SNMP Configuration, or by ordinary SNMP Get and Set operations, or other mechanisms. Support of this additional semantics and cloning functionality is not required for conformance to this MIB. When the additional semantics is not supported, this textual convention behaves identically to the RowPointer textual convention." SYNTAX OBJECT IDENTIFIER -- -- Data Path -- diffServDataPath OBJECT IDENTIFIER ::= { diffServMIBObjects 1 } -- -- Data Path Table -- -- The Data Path Table enumerates the Differentiated Services -- Data Paths within this device. Each entry in this table -- is indexed by ifIndex and ifDirection. Each entry provides -- the first diffserv functional datapath element to process data -- flow for each specific datapath. This table should have at most -- two entries for each DiffServ capable interface on this device; -- ingress and egress. -- -- Notice all diffserv functional datapath elements linked together -- using their individual next pointers and anchored by an entry -- of the diffServDataPathTable must belong to the same datapath. -- The use of next pointer to point to diffserv functional datapath -- element of a different datapath is not allowed. -- diffServDataPathTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServDataPathEntry MAX-ACCESS not-accessible Baker, Chan, Smith Expires May 2001 [Page 29]
Internet Draft Differentiated Services MIB November 2000 STATUS current DESCRIPTION "The data path table defines the data paths in this device. Each data path is defined by the interface and traffic direction. The first diffserv functional datapath element to handle traffic for this data path is defined by a RowPointer, diffServDataPathStart, in the entries of this table." ::= { diffServDataPath 1 } diffServDataPathEntry OBJECT-TYPE SYNTAX DiffServDataPathEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the data path table describes a single diffserv datapath in this device." INDEX { ifIndex, diffServDataPathIfDirection } ::= { diffServDataPathTable 1 } DiffServDataPathEntry ::= SEQUENCE { diffServDataPathIfDirection IfDirection, diffServDataPathStart RowPointer, diffServDataPathStatus RowStatus } diffServDataPathIfDirection OBJECT-TYPE SYNTAX IfDirection MAX-ACCESS not-accessible STATUS current DESCRIPTION "Specifies the direction for which this data path entry applies on this interface." ::= { diffServDataPathEntry 1 } diffServDataPathStart OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This selects the first diffserv functional datapath element to handle traffic for this data path. This RowPointer should point to an instance of one of: Baker, Chan, Smith Expires May 2001 [Page 30]
Internet Draft Differentiated Services MIB November 2000 diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." ::= { diffServDataPathEntry 2 } diffServDataPathStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a row/entry. Any writ- able variable may be modified whether the row is active or notInService." ::= { diffServDataPathEntry 3 } -- -- Classifiers -- diffServClassifier OBJECT IDENTIFIER ::= { diffServMIBObjects 2 } -- -- Classifier Table -- -- Classifier allows multiple classifier elements, of same or different -- types, to be used together. -- A classifier must completely classify all packets presented to it, -- this means all traffic handled by a classifier must match -- at least one classifier element within the classifier, -- with the classifier element parameters specified by a filter. -- -- If there is ambiguity between classifier elements of different Baker, Chan, Smith Expires May 2001 [Page 31]
Internet Draft Differentiated Services MIB November 2000 -- classifier, the precedence is indicated by the order the classifiers -- are linked, the first classifier in the link is applied to the -- traffic first. -- diffServClfrNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServClfrId instance. If a configuring system attempts to create a new row in the diffServClfrTable using this value, that opera- tion will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServClassifier 1 } diffServClfrTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServClfrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates all the diffserv classifier functional datapath elements of this device. The actual classification definitions are defined in diffServClfrElementTable entries belonging to each classifier." REFERENCE "[MODEL] section 4.1" ::= { diffServClassifier 2 } diffServClfrEntry OBJECT-TYPE SYNTAX DiffServClfrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the classifier table describes a single classifier. All classifier elements belonging to the same classifier uses the classifier's diffServClfrId in thier diffServClfrElementClfrId attribute." INDEX { diffServClfrId } ::= { diffServClfrTable 1 } Baker, Chan, Smith Expires May 2001 [Page 32]
Internet Draft Differentiated Services MIB November 2000 DiffServClfrEntry ::= SEQUENCE { diffServClfrId Unsigned32, diffServClfrStatus RowStatus } diffServClfrId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the classifier entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServClfrNextFree." ::= { diffServClfrEntry 1 } diffServClfrStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a classifier. Any writ- able variable may be modified whether the row is active or notInService." ::= { diffServClfrEntry 2 } -- -- Classifier Element Table -- -- Entries in the classifier element table serves as -- the anchor for each classification pattern, defined -- in filter table entries. Each classifier element -- table entry also specifies the subsequent downstream -- diffserv functional datapath element when the -- classification pattern is satisfied. -- Each entry in the classifier element table describes -- one branch of the fan-out characteristic of a classifier -- indicated in [MODEL] section 4.1. A classifier is madeup -- of one or more classifier elements. -- diffServClfrElementNextFree OBJECT-TYPE Baker, Chan, Smith Expires May 2001 [Page 33]
Internet Draft Differentiated Services MIB November 2000 SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServClfrElementId instance. If a configuring system attempts to create a new row in the diffServClfrElementTable using this value, that opera- tion will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServClassifier 3 } diffServClfrElementTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServClfrElementEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The classifier element table enumerates the rela- tionship between classification patterns and subse- quent downstream diffserv functional datapath ele- ments. Classification parameters are defined by entries of filter tables pointed to by diffServClfrElementSpecific. There can be filter tables of different types, and they can be inter- mixed and used within a classifier. An example of a filter table defined in this MIB is diffServSixTu- pleClfrTable, for IP Multi-Field Classifiers (MFCs). Filter tables for other filter types may be defined elsewhere." REFERENCE "[MODEL] section 4.1" ::= { diffServClassifier 4 } diffServClfrElementEntry OBJECT-TYPE SYNTAX DiffServClfrElementEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the classifier element table describes a single element of the classifier." INDEX { diffServClfrElementClfrId, diffServClfrElementId } ::= { diffServClfrElementTable 1 } Baker, Chan, Smith Expires May 2001 [Page 34]
Internet Draft Differentiated Services MIB November 2000 DiffServClfrElementEntry ::= SEQUENCE { diffServClfrElementId Unsigned32, diffServClfrElementClfrId Unsigned32, diffServClfrElementOrder Unsigned32, diffServClfrElementNext RowPointer, diffServClfrElementSpecific StaticRowPointer, diffServClfrElementStatus RowStatus } diffServClfrElementId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Classifier Element entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServClfrElementNextFree." ::= { diffServClfrElementEntry 1 } diffServClfrElementClfrId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "A classifier Id identifies which classifier this classifier element is a part of. This needs to be the value of diffServClfrId attribute for an existing row in diffServClfrTable." ::= { diffServClfrElementEntry 2 } diffServClfrElementOrder OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The relative order in which classifier elements are applied: higher numbers represent classifier ele- ment with higher precedence. Classifier elements with the same order must be unambiguous i.e. they must define non-overlapping patterns, and are con- sidered to be applied simultaneously to the traffic stream. Clas- sifier elements with different Baker, Chan, Smith Expires May 2001 [Page 35]
Internet Draft Differentiated Services MIB November 2000 order may overlap in their filters: the classif- ier element with the highest order that matches is taken. On a given interface, there must be a complete clas- sifier in place at all times in the ingress direction. This means that there will always be one or more filters that match every possible pat- tern that could be presented in an incoming packet. There is no such requirement in the egress direc- tion." DEFVAL { 0 } ::= { diffServClfrElementEntry 3 } diffServClfrElementNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This attribute provides one branch of the fan-out functionality of a classifier described in [MODEL] section 4.1. This selects the next diffserv functional datapath element to handle traffic for this data path. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." ::= { diffServClfrElementEntry 4 } diffServClfrElementSpecific OBJECT-TYPE SYNTAX StaticRowPointer Baker, Chan, Smith Expires May 2001 [Page 36]
Internet Draft Differentiated Services MIB November 2000 MAX-ACCESS read-create STATUS current DESCRIPTION "A pointer to a valid entry in another table, filter table, that describes the applicable classif- ication parameters, e.g. an entry in diffServSixTu- pleClfrTable. If the row pointed to does not exist, the classifier element is ignored. The value zeroDotZero is interpreted to match anything not matched by another classifier element - only one such entry may exist for each classifier." DEFVAL { zeroDotZero } ::= { diffServClfrElementEntry 5 } diffServClfrElementStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a classifier element. Any writ- able variable may be modified whether the row is active or notInService." ::= { diffServClfrElementEntry 6 } -- -- IP Six-Tuple Classification Table -- -- Classification based on 6 different fields in the IP -- header. This is intended to be IP-version-independent. -- Filters, entries in this table, may be shared, pointed to, -- by multiple diffServClfrElementEntry, of same or different -- datapaths in the same system. -- diffServSixTupleClfrNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused Baker, Chan, Smith Expires May 2001 [Page 37]
Internet Draft Differentiated Services MIB November 2000 for a diffServSixTupleClfrId instance. If a configuring system attempts to create a new row in the diffServSixTupleClfrTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServClassifier 5 } diffServSixTupleClfrTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServSixTupleClfrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table of IP Six-Tuple Classifier filter entries that a system may use to identify IP traffic." REFERENCE "[MODEL] section 4.2.2" ::= { diffServClassifier 6 } diffServSixTupleClfrEntry OBJECT-TYPE SYNTAX DiffServSixTupleClfrEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An IP Six-Tuple Classifier entry describes a single filter." INDEX { diffServSixTupleClfrId } ::= { diffServSixTupleClfrTable 1 } DiffServSixTupleClfrEntry ::= SEQUENCE { diffServSixTupleClfrId Unsigned32, diffServSixTupleClfrDstAddrType InetAddressType, diffServSixTupleClfrDstAddr InetAddress, diffServSixTupleClfrDstAddrMask Unsigned32, diffServSixTupleClfrSrcAddrType InetAddressType, diffServSixTupleClfrSrcAddr InetAddress, diffServSixTupleClfrSrcAddrMask Unsigned32, diffServSixTupleClfrDscp Dscp, diffServSixTupleClfrProtocol Unsigned32, diffServSixTupleClfrDstL4PortMin SixTupleClfrL4Port, diffServSixTupleClfrDstL4PortMax SixTupleClfrL4Port, diffServSixTupleClfrSrcL4PortMin SixTupleClfrL4Port, diffServSixTupleClfrSrcL4PortMax SixTupleClfrL4Port, diffServSixTupleClfrStatus RowStatus } Baker, Chan, Smith Expires May 2001 [Page 38]
Internet Draft Differentiated Services MIB November 2000 diffServSixTupleClfrId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Six Tuple Classifier filter entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServSixTupleClfrNextFree." ::= { diffServSixTupleClfrEntry 1 } diffServSixTupleClfrDstAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "The type of IP destination address used by this classifier entry." ::= { diffServSixTupleClfrEntry 2 } diffServSixTupleClfrDstAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The IP address to match against the packet's desti- nation IP address." ::= { diffServSixTupleClfrEntry 3 } diffServSixTupleClfrDstAddrMask OBJECT-TYPE SYNTAX Unsigned32 UNITS "bits" MAX-ACCESS read-create STATUS current DESCRIPTION "The length of a mask for the matching of the desti- nation IP address. Masks are constructed by setting bits in sequence from the most-significant bit down- wards for diffServSixTupleClfrDstAddrMask bits length. All other bits in the mask, up to the number needed to fill the length of the address diffServSix- TupleClfrDstAddr are cleared to zero. A zero bit in the mask then means that the corresponding bit in the Baker, Chan, Smith Expires May 2001 [Page 39]
Internet Draft Differentiated Services MIB November 2000 address always matches." DEFVAL {0} ::= { diffServSixTupleClfrEntry 4 } diffServSixTupleClfrSrcAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "The type of IP source address used by this classif- ier entry." ::= { diffServSixTupleClfrEntry 5 } diffServSixTupleClfrSrcAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "The IP address to match against the source IP address of each packet." ::= { diffServSixTupleClfrEntry 6 } diffServSixTupleClfrSrcAddrMask OBJECT-TYPE SYNTAX Unsigned32 UNITS "bits" MAX-ACCESS read-create STATUS current DESCRIPTION "The length of a mask for the matching of the source IP address. Masks are constructed by setting bits in sequence from the most-significant bit downwards for diffServSixTupleClfrSrcAddrMask bits length. All other bits in the mask, up to the number needed to fill the length of the address diffServSixTu- pleClfrSrcAddr are cleared to zero. A zero bit in the mask then means that the corresponding bit in the address always matches." DEFVAL {0} ::= { diffServSixTupleClfrEntry 7 } diffServSixTupleClfrDscp OBJECT-TYPE SYNTAX Dscp MAX-ACCESS read-create Baker, Chan, Smith Expires May 2001 [Page 40]
Internet Draft Differentiated Services MIB November 2000 STATUS current DESCRIPTION "The value that the DSCP in the packet must have to match this entry. A value of -1 indicates that a specific DSCP value has not been defined and thus all DSCP values are considered a match." DEFVAL {-1} ::= { diffServSixTupleClfrEntry 8 } diffServSixTupleClfrProtocol OBJECT-TYPE SYNTAX Unsigned32 (0..255) MAX-ACCESS read-create STATUS current DESCRIPTION "The IP protocol to match against the IPv4 protocol number or the IPv6 Next-Header number in the packet. A value of 255 means match all. Note the protocol number of 255 is reserved by IANA, and Next-Header number of 0 is used in IPv6." DEFVAL {255} ::= { diffServSixTupleClfrEntry 9 } diffServSixTupleClfrDstL4PortMin OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum value that the layer-4 destination port number in the packet must have in order to match this classifier entry." DEFVAL {0} ::= { diffServSixTupleClfrEntry 10 } diffServSixTupleClfrDstL4PortMax OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum value that the layer-4 destination port number in the packet must have in order to match this classifier entry. This value must be equal to or greater than the value specified for this entry in diffServSixTupleClfrDstL4PortMin." DEFVAL {65535} Baker, Chan, Smith Expires May 2001 [Page 41]
Internet Draft Differentiated Services MIB November 2000 ::= { diffServSixTupleClfrEntry 11 } diffServSixTupleClfrSrcL4PortMin OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum value that the layer-4 source port number in the packet must have in order to match this classifier entry." DEFVAL {0} ::= { diffServSixTupleClfrEntry 12 } diffServSixTupleClfrSrcL4PortMax OBJECT-TYPE SYNTAX SixTupleClfrL4Port MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum value that the layer-4 source port number in the packet must have in oder to match this classifier entry. This value must be equal to or greater than the value specified for this entry in diffServSixTupleClfrSrcL4PortMin." DEFVAL {65535} ::= { diffServSixTupleClfrEntry 13 } diffServSixTupleClfrStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a classifier. Any writ- able variable may be modified whether the row is active or notInService." ::= { diffServSixTupleClfrEntry 14 } -- -- Meters -- diffServMeter OBJECT IDENTIFIER ::= { diffServMIBObjects 3 } Baker, Chan, Smith Expires May 2001 [Page 42]
Internet Draft Differentiated Services MIB November 2000 -- -- This MIB supports a variety of Meters. It includes a -- specific definition for Meters whose parameter set can -- be modelled using Token Bucket parameters. -- Other metering parameter sets can be defined and used -- when necessary. -- -- Multiple meter elements may be logically cascaded using -- their diffServMeterSucceedNext and diffServMeterFailNext -- pointers if required. -- One example of this might be for an AF PHB implementation -- that uses multiple level conformance meters. -- -- Cascading of individual meter elements in the MIB is -- intended to be functionally equivalent to multiple level -- conformance determination of a packet. The sequential -- nature of the representation is merely a notational -- convenience for this MIB. -- -- For example: -- Conforming to RFC 2697, srTCM can be parameterized using -- two sets of diffServMeterEntry and diffServTBMeterEntry. -- With the first set parameterizing the Committed Burst Size -- token-bucket, second set parameterizing the Excess Burst Size -- token-bucket. With both set's diffServTBMeterRate parameters -- being used to reflect the Committed Information Rate value. -- -- Conforming to RFC 2698, trTCM can be parameterized using -- two sets of diffServMeterEntry and diffServTBMeterEntry. -- With the first set parameterizing the Peak Information Rate -- and Peak Burst Size token-bucket, second set parameterizing -- the Committed Information Rate and Committed Burst Size -- token-bucket. -- -- Conforming to RFC 2859, tswTCM can be parameterized using -- two sets of diffServMeterEntry and diffServTBMeterEntry. -- With the first set parameterizing the Committed Target Rate, -- second set parametering the Peak Target Rate. -- With both set's diffServTBMeterInterval being used to -- reflect the Average Interval as specified by RFC 2859. -- diffServMeterNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current Baker, Chan, Smith Expires May 2001 [Page 43]
Internet Draft Differentiated Services MIB November 2000 DESCRIPTION "This object yields a value when read that is currently unused for a diffServMeterId instance. If a configuring system attempts to create a new row in the diffServMeterTable using this value, that opera- tion will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServMeter 1 } diffServMeterTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates specific meters that a system may use to police, or shape, a stream of traffic. The traffic stream to be metered is determined by the diffserv functional datapath element(s) upstream of the meter i.e. by the object(s) that point to each entry in this table. This may include all traffic on an interface. Specific meter details are to be found in table entry referenced by diffServMeterSpecific." REFERENCE "[MODEL] section 5.1" ::= { diffServMeter 2 } diffServMeterEntry OBJECT-TYPE SYNTAX DiffServMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the meter table describes a single con- formance level of a meter." INDEX { diffServMeterId } ::= { diffServMeterTable 1 } DiffServMeterEntry ::= SEQUENCE { diffServMeterId Unsigned32, diffServMeterSucceedNext RowPointer, diffServMeterFailNext RowPointer, diffServMeterSpecific StaticRowPointer, Baker, Chan, Smith Expires May 2001 [Page 44]
Internet Draft Differentiated Services MIB November 2000 diffServMeterStatus RowStatus } diffServMeterId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Meter entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServMeterNextFree." ::= { diffServMeterEntry 1 } diffServMeterSucceedNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "If the traffic does conform, this selects the next diffserv functional datapath element to handle traffic for this data path. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." DEFVAL { zeroDotZero } ::= { diffServMeterEntry 2 } diffServMeterFailNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create Baker, Chan, Smith Expires May 2001 [Page 45]
Internet Draft Differentiated Services MIB November 2000 STATUS current DESCRIPTION "If the traffic does not conform, this selects the next diffserv functional datapath element to handle traffic for this data path. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." DEFVAL { zeroDotZero } ::= { diffServMeterEntry 3 } diffServMeterSpecific OBJECT-TYPE SYNTAX StaticRowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This indicates the behaviour of the meter by point- ing to an entry containing detailed parameters. Note that entries in that specific table must be managed explicitly. For example, diffServMeterSpecific may point to an entry in diffServTBMeterTable, which contains an instance of a single set of Token Bucket parameters." ::= { diffServMeterEntry 4 } diffServMeterStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, Baker, Chan, Smith Expires May 2001 [Page 46]
Internet Draft Differentiated Services MIB November 2000 deactivation, or deletion of a meter. Any writable variable may be modified whether the row is active or notInService." ::= { diffServMeterEntry 5 } -- -- Token Bucket Meter Table -- -- Each entry in the Token Bucket Meter Table parameterize -- a single token bucket. Multiple token buckets can be -- used together to parameterize multiple levels of -- conformance. -- -- Note that an entry in the Token Bucket Meter Table can -- be shared, pointed to, by multiple diffServMeterTable -- entries. -- diffServTBMeterNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServTBMeterId instance. If a configuring system attempts to create a new row in the diffServTBMeterTable using this value, that operation will fail if the value has, in the mean- time, been used to create another row that is currently valid." ::= { diffServMeter 3 } diffServTBMeterTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServTBMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates a single set of token bucket meter parameters that a system may use to police a stream of traffic. Such meters are modelled here as having a single rate and a single burst size." REFERENCE "[MODEL] section 5.1" ::= { diffServMeter 4 } Baker, Chan, Smith Expires May 2001 [Page 47]
Internet Draft Differentiated Services MIB November 2000 diffServTBMeterEntry OBJECT-TYPE SYNTAX DiffServTBMeterEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry that describes a single set of token bucket meter parameters." INDEX { diffServTBMeterId } ::= { diffServTBMeterTable 1 } DiffServTBMeterEntry ::= SEQUENCE { diffServTBMeterId Unsigned32, diffServTBMeterType INTEGER, diffServTBMeterRate Unsigned32, diffServTBMeterBurstSize BurstSize, diffServTBMeterInterval Unsigned32, diffServTBMeterStatus RowStatus } diffServTBMeterId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the TBMeter entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServTBMeterNextFree." ::= { diffServTBMeterEntry 1 } diffServTBMeterType OBJECT-TYPE SYNTAX INTEGER { other(1), -- not listed here tokenBucket(2), -- Simple Token Bucket avgRate(3), -- Average Rate srTCMBlind(4), -- srTCM, Color-blind srTCMAware(5), -- srTCM, Color-aware trTCMBlind(6), -- trTCM, Color-blind trTCMAware(7), -- trTCM, Color-aware tswTCM(8) -- tswTCM } MAX-ACCESS read-create STATUS current DESCRIPTION Baker, Chan, Smith Expires May 2001 [Page 48]
Internet Draft Differentiated Services MIB November 2000 "The type of meter using parameters specified by this TBMeter entry. Value of tokenBucket(2) indicates the use of Two Parameter Token Bucket Meter as described in [MODEL] section 5.2.3. Value of avgRate(3) indicates the use of Average Rate Meter as described in [MODEL] section 5.2.1. Value of srTCMBlind(4) and srTCMAware(5) indicates the use of Single Rate Three Color Marker Metering as defined by RFC 2697, with `Color Blind' and `Color Aware' mode as described by the RFC. Value of trTCMBlind(6) and trTCMAware(7) indicates the use of Two Rate Three Color Marker Metering as defined by RFC 2698, with `Color Blind' and `Color Aware' mode as described by the RFC. Value of tswTCM(8) indicates the use of Time Sliding Window Three Color Marker Metering as defined by RFC 2859." REFERENCE "[MODEL] section 5" ::= { diffServTBMeterEntry 2 } diffServTBMeterRate OBJECT-TYPE SYNTAX Unsigned32 UNITS "kilobits per second" MAX-ACCESS read-create STATUS current DESCRIPTION "The token-bucket rate, in kilobits per second (kbps). This attribute is used for: 1. CIR in RFC 2697 for srTCM 2. PIR and CIR in RFC 2698 for trTCM 3. CTR and PTR in RFC 2859 for TSWTCM 4. AverageRate used in [MODEL] section 5." ::= { diffServTBMeterEntry 3 } diffServTBMeterBurstSize OBJECT-TYPE SYNTAX BurstSize UNITS "Bytes" MAX-ACCESS read-create STATUS current Baker, Chan, Smith Expires May 2001 [Page 49]
Internet Draft Differentiated Services MIB November 2000 DESCRIPTION "The maximum number of bytes in a single transmission burst. This attribute is used for: 1. CBS and EBS in RFC 2697 for srTCM 2. CBS and PBS in RFC 2698 for trTCM 3. Burst Size used in [MODEL] section 5." ::= { diffServTBMeterEntry 4 } diffServTBMeterInterval OBJECT-TYPE SYNTAX Unsigned32 UNITS "microseconds" MAX-ACCESS read-create STATUS current DESCRIPTION "The time interval used with the token bucket. For: 1. Average Rate Meter, [MODEL] section 5.2.1, - Delta. 2. Simple Token Bucket Meter, [MODEL] section 5.1, - time interval t. 3. RFC 2859 TSWTCM, - AVG_INTERVAL. 4. RFC 2697 srTCM, RFC 2698 trTCM, - token bucket update time interval." ::= { diffServTBMeterEntry 5 } diffServTBMeterStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a meter. Any writable variable may be modified whether the row is active or notInService." ::= { diffServTBMeterEntry 6 } -- -- Actions -- diffServAction OBJECT IDENTIFIER ::= { diffServMIBObjects 4 } -- -- The Action Table allows enumeration of the different -- types of actions to be applied to a traffic flow. -- Baker, Chan, Smith Expires May 2001 [Page 50]
Internet Draft Differentiated Services MIB November 2000 diffServActionNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServActionId instance. If a configuring system attempts to create a new row in the diffServActionTable using this value, that opera- tion will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServAction 1 } diffServActionTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServActionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Action Table enumerates actions that can be per- formed to a stream of traffic. Multiple actions can be concatenated. For example, after marking a stream of traffic exiting from a meter, a device can then perform a count action of the conforming or non- conforming traffic. Specific actions are indicated by diffServAction- Specific which points to an entry of a specific action type parameterizing the action in detail." REFERENCE "[MODEL] section 6." ::= { diffServAction 2 } diffServActionEntry OBJECT-TYPE SYNTAX DiffServActionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Each entry in the action table allows description of one specific action to be applied to traffic." INDEX { diffServActionId } ::= { diffServActionTable 1 } DiffServActionEntry ::= SEQUENCE { Baker, Chan, Smith Expires May 2001 [Page 51]
Internet Draft Differentiated Services MIB November 2000 diffServActionId Unsigned32, diffServActionNext RowPointer, diffServActionSpecific StaticRowPointer, diffServActionType INTEGER, diffServActionStatus RowStatus } diffServActionId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Action entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServActionNextFree." ::= { diffServActionEntry 1 } diffServActionNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This selects the next diffserv functional datapath element to handle traffic for this data path. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." DEFVAL { zeroDotZero } ::= { diffServActionEntry 2 } Baker, Chan, Smith Expires May 2001 [Page 52]
Internet Draft Differentiated Services MIB November 2000 diffServActionSpecific OBJECT-TYPE SYNTAX StaticRowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "A pointer to an object instance providing additional information for the type of action indicated by this action table entry. For the standard actions defined by this MIB module, this should point to one of the following: a diffServDscpMarkActEntry, a diffServCountActEntry. For other actions, it may point to an object instance defined in some other MIB." ::= { diffServActionEntry 3 } diffServActionType OBJECT-TYPE SYNTAX INTEGER { other(1), -- types not specified here specific(2), -- follow the Specific pointer absoluteDrop(3) -- disallow traffic } MAX-ACCESS read-create STATUS current DESCRIPTION "Indicates the type of action. The values specific(2) must be associated with additional information, pointed to by diffServActionSpecific, with the actual action type indicated by the object being pointed to. The value absoluteDrop(3) has no associated informa- tion and will have a diffServActionSpecific value of zeroDotZero. The use of other(1) is outside the scope of this definition, although the diffServAc- tionSpecific pointer may be used in this case, to indicate other information." ::= { diffServActionEntry 4 } diffServActionStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation or deletion of an action element. Any writable variable may be modified whether the row is Baker, Chan, Smith Expires May 2001 [Page 53]
Internet Draft Differentiated Services MIB November 2000 active or notInService." ::= { diffServActionEntry 5 } -- -- DSCP Mark Action Table -- -- Rows of this table are pointed to by diffServActionSpecific -- to provide detailed parameters specific to the DSCP -- Mark action. -- -- A single entry in this table can be shared, pointed to, by -- multiple diffServActionTable entries, of same or different -- datapaths. -- diffServDscpMarkActTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServDscpMarkActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table enumerates specific DSCPs used for mark- ing or remarking the DSCP field of IP packets. The entries of this table may be referenced by a diffSer- vActionSpecific attribute." REFERENCE "[MODEL] section 6.1" ::= { diffServAction 3 } diffServDscpMarkActEntry OBJECT-TYPE SYNTAX DiffServDscpMarkActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the DSCP mark action table that describes a single DSCP used for marking." INDEX { diffServDscpMarkActDscp } ::= { diffServDscpMarkActTable 1 } DiffServDscpMarkActEntry ::= SEQUENCE { diffServDscpMarkActDscp Dscp } Baker, Chan, Smith Expires May 2001 [Page 54]
Internet Draft Differentiated Services MIB November 2000 diffServDscpMarkActDscp OBJECT-TYPE SYNTAX Dscp MAX-ACCESS read-only STATUS current DESCRIPTION "The DSCP that this Action uses for marking/remarking traffic. Note that a DSCP value of -1 is not permit- ted in this table. It is quite possible that the only packets subject to this Action are already marked with this DSCP. Note also that Diffserv may result in packet remarking both on ingress to a net- work and on egress from it and it is quite possible that ingress and egress would occur in the same router." ::= { diffServDscpMarkActEntry 1 } -- -- Count Action Table -- -- Due to the fact that the MIB structure allows multiple -- cascading diffServActionEntry be used to describe -- multiple actions for a datapath, the counter became an -- optional action type. In normal implementation, a -- datapath either have counters or it doesn't, it is not -- an element the management entity can add or remove. -- The management entity can choose to read the counter or -- not. Hence it is recommended for implementation that -- have counters to always configure the count action as -- the first of multiple actions, for example before the -- the absolute drop action. -- diffServCountActNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServCountActId instance. If a configuring system attempts to create a new row in the diffServCountActTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServAction 4 } Baker, Chan, Smith Expires May 2001 [Page 55]
Internet Draft Differentiated Services MIB November 2000 diffServCountActTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServCountActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table contains counters for all the traffic passing through an action element." REFERENCE "[MODEL] section 6.4" ::= { diffServAction 5 } diffServCountActEntry OBJECT-TYPE SYNTAX DiffServCountActEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the count action table describes a sin- gle set of traffic counters." INDEX { diffServCountActId } ::= { diffServCountActTable 1 } DiffServCountActEntry ::= SEQUENCE { diffServCountActId Unsigned32, diffServCountActOctets Counter32, diffServCountActHCOctets Counter64, diffServCountActPkts Counter32, diffServCountActHCPkts Counter64, diffServCountActDiscontTime TimeStamp, diffServCountActStatus RowStatus } diffServCountActId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Count Action entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServCountActNextFree." ::= { diffServCountActEntry 1 } diffServCountActOctets OBJECT-TYPE Baker, Chan, Smith Expires May 2001 [Page 56]
Internet Draft Differentiated Services MIB November 2000 SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets at the Action datapath element. On high speed devices, this object implements the least significant 32 bits of diffServCountActHCOc- tets. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 2 } diffServCountActHCOctets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets at the Action datapath element. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 3 } diffServCountActPkts OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets at the Action datapath ele- ment. On high speed devices, this object implements the least significant 32 bits of diffServCoun- tActHCPkts. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 4 } Baker, Chan, Smith Expires May 2001 [Page 57]
Internet Draft Differentiated Services MIB November 2000 diffServCountActHCPkts OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets at the Action datapath ele- ment. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of diffServCountActDiscontTime for this entry." ::= { diffServCountActEntry 5 } diffServCountActDiscontTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime on the most recent occasion at which any one or more of this entry's counters suffered a discontinuity. If no such discontinuities have occurred since the last re-initialization of the local management subsystem, then this object contains a zero value." ::= { diffServCountActEntry 6 } diffServCountActStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of this entry. Any writable variable may be modified whether the row is active or notInService." ::= { diffServCountActEntry 7 } -- -- Algorithmic Drop Table -- diffServAlgDrop OBJECT IDENTIFIER ::= { diffServMIBObjects 5 } Baker, Chan, Smith Expires May 2001 [Page 58]
Internet Draft Differentiated Services MIB November 2000 diffServAlgDropNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServAlgDropId instance. If a configuring system attempts to create a new row in the diffServAlgDropTable using this value, that operation will fail if the value has, in the mean- time, been used to create another row that is currently valid." ::= { diffServAlgDrop 1 } diffServAlgDropTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServAlgDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The algorithmic drop table contains entries describ- ing an element that drops packets according to some algorithm." REFERENCE "[MODEL] section 7.1.3" ::= { diffServAlgDrop 2 } diffServAlgDropEntry OBJECT-TYPE SYNTAX DiffServAlgDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry describes a process that drops packets according to some algorithm. Further details of the algorithm type are to be found in diffServAlgDropType and with more detail parameter entry pointed to by diffServAlgDropSpecific when necessary." INDEX { diffServAlgDropId } ::= { diffServAlgDropTable 1 } DiffServAlgDropEntry ::= SEQUENCE { diffServAlgDropId Unsigned32, diffServAlgDropType INTEGER, diffServAlgDropNext RowPointer, diffServAlgDropQMeasure RowPointer, Baker, Chan, Smith Expires May 2001 [Page 59]
Internet Draft Differentiated Services MIB November 2000 diffServAlgDropQThreshold Unsigned32, diffServAlgDropSpecific StaticRowPointer, diffServAlgDropOctets Counter32, diffServAlgDropHCOctets Counter64, diffServAlgDropPkts Counter32, diffServAlgDropHCPkts Counter64, diffServAlgDropStatus RowStatus } diffServAlgDropId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Algorithmic Dropper entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServAlgDrop- NextFree." ::= { diffServAlgDropEntry 1 } diffServAlgDropType OBJECT-TYPE SYNTAX INTEGER { other(1), tailDrop(2), headDrop(3), randomDrop(4) } MAX-ACCESS read-create STATUS current DESCRIPTION "The type of algorithm used by this dropper. A value of tailDrop(2) or headDrop(3) represents an algorithm that is completely specified by this MIB. A value of other(1) requires further specification in some other MIB module. The tailDrop(2) algorithm is described as follows: diffServAlgDropQThreshold represents the depth of the queue, pointed to by diffServAlgDropQMeasure, at which all newly arriving packets will be dropped. The headDrop(3) algorithm is described as follows: if a packet arrives when the current depth of the queue, pointed to by diffServAlgDropQMeasure, is at diffSer- Baker, Chan, Smith Expires May 2001 [Page 60]
Internet Draft Differentiated Services MIB November 2000 vAlgDropQThreshold, packets currently at the head of the queue are dropped to make room for the new packet to be enqueued at the tail of the queue. The randomDrop(4) algorithm is described as follows: on packet arrival, an algorithm is executed which may randomly drop the packet, or drop other packet(s) from the queue in its place. The specifics of the algorithm may be proprietary. For this algorithm, diffServAlgDropSpecific points to a diffServRandom- DropEntry that describes the algorithm. For this algorithm, diffServAlgQThreshold is understood to be the absolute maximum size of the queue and additional parameters are described in diffServRandomDropTable." ::= { diffServAlgDropEntry 2 } diffServAlgDropNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This selects the next diffserv functional datapath element to handle traffic for this data path. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." ::= { diffServAlgDropEntry 3 } diffServAlgDropQMeasure OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current Baker, Chan, Smith Expires May 2001 [Page 61]
Internet Draft Differentiated Services MIB November 2000 DESCRIPTION "Points to an entry in the diffServQTable to indicate the queue that a drop algorithm is to monitor when deciding whether to drop a packet. If the row pointed to does not exist, the algorithmic dropper element is considered inactive." ::= { diffServAlgDropEntry 4 } diffServAlgDropQThreshold OBJECT-TYPE SYNTAX Unsigned32 UNITS "Bytes" MAX-ACCESS read-create STATUS current DESCRIPTION "A threshold on the depth in bytes of the queue being measured at which a trigger is generated to the drop- ping algorithm. For the tailDrop(2) or headDrop(3) algorithms, this represents the depth of the queue, pointed to by diffServAlgDropQMeasure, at which the drop action will take place. Other algorithms will need to define their own semantics for this threshold." ::= { diffServAlgDropEntry 5 } diffServAlgDropSpecific OBJECT-TYPE SYNTAX StaticRowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "Points to a table entry that provides further detail regarding a drop algorithm. Entries with diffServAlgDropType equal to other(1) may have this point to a table defined in another MIB module. Entries with diffServAlgDropType equal to random- Drop(4) must have this point to an entry in diffSer- vRandomDropTable. For all other algorithms, this should take the value zeroDotzero." ::= { diffServAlgDropEntry 6 } Baker, Chan, Smith Expires May 2001 [Page 62]
Internet Draft Differentiated Services MIB November 2000 diffServAlgDropOctets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets that have been dropped by this drop process. On high speed devices, this object implements the least significant 32 bits of diffSer- vAlgDropHCOctets. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this inter- face." ::= { diffServAlgDropEntry 7 } diffServAlgDropHCOctets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets that have been dropped by this drop process. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this inter- face." ::= { diffServAlgDropEntry 8 } diffServAlgDropPkts OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets that have been dropped by this drop process. On high speed devices, this object implements the least significant 32 bits of diffSer- vAlgDropHCPkts. Discontinuities in the value of this counter can occur at re-initialization of the management system Baker, Chan, Smith Expires May 2001 [Page 63]
Internet Draft Differentiated Services MIB November 2000 and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this inter- face." ::= { diffServAlgDropEntry 9 } diffServAlgDropHCPkts OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets that have been dropped by this drop process. This object should be used on high speed interfaces. Discontinuities in the value of this counter can occur at re-initialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime appropriate to this inter- face." ::= { diffServAlgDropEntry 10 } diffServAlgDropStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of this entry. Any writable variable may be modified whether the row is active or notInService." ::= { diffServAlgDropEntry 11 } -- -- Random Drop Table -- diffServRandomDropNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServRandomDropId instance. Baker, Chan, Smith Expires May 2001 [Page 64]
Internet Draft Differentiated Services MIB November 2000 If a configuring system attempts to create a new row in the diffServRandomDropTable using this value, that operation will fail if the value has, in the mean- time, been used to create another row that is currently valid." ::= { diffServAlgDrop 3 } diffServRandomDropTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServRandomDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The random drop table contains entries describing a process that drops packets randomly. Entries in this table is intended to be pointed to by diffSer- vAlgDropSpecific." REFERENCE "[MODEL] section 7.1.3" ::= { diffServAlgDrop 4 } diffServRandomDropEntry OBJECT-TYPE SYNTAX DiffServRandomDropEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry describes a process that drops packets according to a random algorithm." INDEX { diffServRandomDropId } ::= { diffServRandomDropTable 1 } DiffServRandomDropEntry ::= SEQUENCE { diffServRandomDropId Unsigned32, diffServRandomDropMinThreshBytes Unsigned32, diffServRandomDropMinThreshPkts Unsigned32, diffServRandomDropMaxThreshBytes Unsigned32, diffServRandomDropMaxThreshPkts Unsigned32, diffServRandomDropInvProbMax Unsigned32, diffServRandomDropInvWeight Unsigned32, diffServRandomDropSamplingRate Unsigned32, diffServRandomDropStatus RowStatus } diffServRandomDropId OBJECT-TYPE Baker, Chan, Smith Expires May 2001 [Page 65]
Internet Draft Differentiated Services MIB November 2000 SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Random Drop entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServRandomDropNextFree." ::= { diffServRandomDropEntry 1 } diffServRandomDropMinThreshBytes OBJECT-TYPE SYNTAX Unsigned32 UNITS "bytes" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth in bytes, beyond which traffic has a non-zero probability of being dropped. Changes in this variable may or may not be reflected in the reported value of diffServRandomDrop- MinThreshPkts." ::= { diffServRandomDropEntry 2 } diffServRandomDropMinThreshPkts OBJECT-TYPE SYNTAX Unsigned32 UNITS "packets" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth in packets, beyond which traffic has a non-zero probability of being dropped. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMinThresh- Bytes." ::= { diffServRandomDropEntry 3 } diffServRandomDropMaxThreshBytes OBJECT-TYPE SYNTAX Unsigned32 UNITS "bytes" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth beyond which traffic has a probability indicated by diffServRandomDropInvProbMax Baker, Chan, Smith Expires May 2001 [Page 66]
Internet Draft Differentiated Services MIB November 2000 of being dropped or marked. Note that this differs from the physical queue limit, which is stored in diffServAlgDropQThreshold. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMaxThreshPkts." ::= { diffServRandomDropEntry 4 } diffServRandomDropMaxThreshPkts OBJECT-TYPE SYNTAX Unsigned32 UNITS "packets" MAX-ACCESS read-create STATUS current DESCRIPTION "The average queue depth beyond which traffic has a probability indicated by diffServRandomDropInvProbMax of being dropped or marked. Note that this differs from the physical queue limit, which is stored in diffServAlgDropQThreshold. Changes in this variable may or may not be reflected in the reported value of diffServRandomDropMaxThreshBytes." ::= { diffServRandomDropEntry 5 } diffServRandomDropInvProbMax OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The worst case random drop probability, expressed as the inverse of the drop probability. With special case of the value zero meaning zero probability of drop. For example, if every packet may be dropped in the worst case (100%), this has the value of 4,294,967,295." ::= { diffServRandomDropEntry 6 } diffServRandomDropInvWeight OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The weighting of past history in affecting the cal- culation of the current queue average. The moving Baker, Chan, Smith Expires May 2001 [Page 67]
Internet Draft Differentiated Services MIB November 2000 average of the queue depth uses the inverse of this value as the factor for the new queue depth, and one minus that inverse as the factor for the historical average. Implementations may choose to limit the acceptable set of values to a specified set, such as powers of 2." ::= { diffServRandomDropEntry 7 } diffServRandomDropSamplingRate OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The number of times per second the queue is sampled for queue average calculation. A value of zero means the queue is sampled approximately each time a packet is enqueued (or dequeued)." ::= { diffServRandomDropEntry 8 } diffServRandomDropStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of this entry. Any writable variable may be modified whether the row is active or notInService." ::= { diffServRandomDropEntry 9 } -- -- Queue Table -- diffServQueue OBJECT IDENTIFIER ::= { diffServMIBObjects 6 } -- -- An entry of diffServQTable represents a FIFO queue diffserv -- functional datapath element as described in [MODEL] section -- 7.1.1. -- Notice the specification of scheduling parameters for a queue -- as part of the input to a scheduler functional datapath Baker, Chan, Smith Expires May 2001 [Page 68]
Internet Draft Differentiated Services MIB November 2000 -- element as described in [MODEL] section 7.1.2. This allows -- building of hierarchical queueing/scheduling. -- A queue therefore is parameterized by: -- 1. Which scheduler will service this queue, diffServQNext. -- 2. How the scheduler will service this queue, with respect -- to all the other queues the same scheduler needs to service, -- diffServQSchdParam. -- -- Notice one or more upstream diffserv datapath element may share, -- point to, a diffServQTable entry as described in [MODEL] section -- 7.1.1. -- -- Each entry of the diffServQTable belongs to one and only one -- datapath. -- diffServQNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServQId instance. If a configuring system attempts to create a new row in the diffServQTable using this value, that operation will fail if the value has, in the meantime, been used to create another row that is currently valid." ::= { diffServQueue 1 } diffServQTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServQEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Queue Table enumerates the individual queues." REFERENCE "[MODEL] section 7.1.1" ::= { diffServQueue 2 } diffServQEntry OBJECT-TYPE SYNTAX DiffServQEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION Baker, Chan, Smith Expires May 2001 [Page 69]
Internet Draft Differentiated Services MIB November 2000 "An entry in the Queue Table describes a single queue. With each entry belonging to one and only one datapath." INDEX { diffServQId } ::= { diffServQTable 1 } DiffServQEntry ::= SEQUENCE { diffServQId Unsigned32, diffServQNext RowPointer, diffServQSchdParam StaticRowPointer, diffServQStatus RowStatus } diffServQId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Queue entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServQNextFree." ::= { diffServQEntry 1 } diffServQNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This selects the next diffserv functional datapath element to handle traffic for this data path. This RowPointer must point to an instance of one of: diffServSchedulerEntry A value of zeroDotZero in this attribute indicates an incomplete diffServQEntry instance. An illegal con- figuration. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." ::= { diffServQEntry 2 } Baker, Chan, Smith Expires May 2001 [Page 70]
Internet Draft Differentiated Services MIB November 2000 diffServQSchdParam OBJECT-TYPE SYNTAX StaticRowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This StaticRowPointer indicates the entry in diffServSchdParamTable the scheduler, pointed to by diffServQNext, should use to service this queue. A value of zeroDotZero in this attribute indicates an incomplete diffServQEntry instance. An illegal con- figuration. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zero- DotZero." ::= { diffServQEntry 3 } diffServQStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a queue. Any writable variable may be modified whether the row is active or notInService." ::= { diffServQEntry 4 } -- -- Scheduler Table -- diffServScheduler OBJECT IDENTIFIER ::= { diffServMIBObjects 7 } -- -- The Scheduler Table is used for representing packet schedulers: -- it provides flexibility for multiple scheduling algorithms, each -- servicing multiple queues, to be used on the same logical/physical -- interface. -- Notice the servicing parameters the scheduler uses is -- specified by each of its upstream functional datapath elements, -- most likely queues or schedulers. -- The coordination and coherency between the servicing parameters -- of the scheduler's upstream functional datapath elements must Baker, Chan, Smith Expires May 2001 [Page 71]
Internet Draft Differentiated Services MIB November 2000 -- be maintained for the scheduler to function correctly. -- -- The diffServSchedulerSchdParam attribute is used for specifying -- the servicing parameters for output of a scheduler when its -- downstream functional datapath element is another scheduler. -- This is used for building hierarchical queue/scheduler. -- -- More discussion of the scheduler functional datapath element -- is in [MODEL] section 7.1.2. -- diffServSchedulerPriority OBJECT-IDENTITY STATUS current DESCRIPTION "For use with diffServSchedulerMethod to indicate Priority scheduling method, defined as an algorithm in which the presence of data in a queue or set of queues absolutely precludes dequeue from another queue or set of queues. Notice attributes from diffServSchdParamEntry of the queues/schedulers feed- ing this scheduler are used when determining the next packet to schedule." REFERENCE "[MODEL] section 7.1.2" ::= { diffServScheduler 1 } diffServSchedulerWRR OBJECT-IDENTITY STATUS current DESCRIPTION "For use with diffServSchedulerMethod to indicate Weighted Round Robin scheduling method, defined as any algorithm in which a set of queues are visited in a fixed order, and varying amounts of traffic are removed from each queue in turn to implement an aver- age output rate by class. Notice attributes from diffServSchdParamEntry of the queues/schedulers feed- ing this scheduler are used when determining the next packet to schedule." REFERENCE "[MODEL] section 7.1.2" ::= { diffServScheduler 2 } diffServSchedulerWFQ OBJECT-IDENTITY STATUS current Baker, Chan, Smith Expires May 2001 [Page 72]
Internet Draft Differentiated Services MIB November 2000 DESCRIPTION "For use with diffServSchedulerMethod to indicate Weighted Fair Queueing scheduling method, defined as any algorithm in which a set of queues are conceptu- ally visited in some order, to implement an average output rate by class. Notice attributes from diffServSchdParamEntry of the queues/schedulers feed- ing this scheduler are used when determining the next packet to schedule." REFERENCE "[MODEL] section 7.1.2" ::= { diffServScheduler 3 } diffServSchedulerShaping OBJECT-IDENTITY STATUS current DESCRIPTION "For use with diffServSchedulerMethod to indicate the scheduler is being used for shaping. Notice attri- butes from diffServSchdParamEntry of the queues/schedulers feeding this scheduler are used when determining the next packet to schedule." REFERENCE "[MODEL] section 7.1.2" ::= { diffServScheduler 4 } diffServSchedulerNextFree OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServSchedulerId instance. If a configuring system attempts to create a new row in the diffServSchedulerTable using this value, that operation will fail if the value has, in the mean- time, been used to create another row that is currently valid." ::= { diffServScheduler 5 } diffServSchedulerTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServSchedulerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION Baker, Chan, Smith Expires May 2001 [Page 73]
Internet Draft Differentiated Services MIB November 2000 "The Scheduler Table enumerates packet schedulers. Multiple scheduling algorithms can be used on a given datapath, with each algorithm described by one diffServSchedulerEntry." REFERENCE "[MODEL] section 7.1.2" ::= { diffServScheduler 6 } diffServSchedulerEntry OBJECT-TYPE SYNTAX DiffServSchedulerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the Scheduler Table describing a single instance of a scheduling algorithm." INDEX { diffServSchedulerId } ::= { diffServSchedulerTable 1 } DiffServSchedulerEntry ::= SEQUENCE { diffServSchedulerId Unsigned32, diffServSchedulerNext RowPointer, diffServSchedulerMethod OBJECT IDENTIFIER, diffServSchedulerSchdParam StaticRowPointer, diffServSchedulerStatus RowStatus } diffServSchedulerId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Scheduler entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServSchedulerNextFree." ::= { diffServSchedulerEntry 1 } diffServSchedulerNext OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This selects the next diffserv functional datapath Baker, Chan, Smith Expires May 2001 [Page 74]
Internet Draft Differentiated Services MIB November 2000 element to handle traffic for this data path. This RowPointer should point to an instance of one of: diffServSchedulerEntry diffServQEntry As indicated by [MODEL] section 7.1.4. But this RowPointer can also point to an instance of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry For building of multiple TCBs for the same data path. This should point to another diffServSchedulerEntry for implementation of multiple scheduler methods for the same datapath, and for implementation of hierarchical schedulers. A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this datapath. The use of zeroDotZero is the normal usage for the last functional datapath element of the current data path. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zeroDotZero." DEFVAL { zeroDotZero } ::= { diffServSchedulerEntry 2 } diffServSchedulerMethod OBJECT-TYPE SYNTAX OBJECT IDENTIFIER MAX-ACCESS read-create STATUS current DESCRIPTION "The scheduling algorithm used by this Scheduler. {0 0} indicates this is unknown. Standard values for generic algorithms: diffServSchedulerPriority, diffServSchedulerWRR, and diffServSchedulerWFQ are specified in this MIB; additional values may be further specified in other MIBs." REFERENCE "[MODEL] section 7.1.2" ::= { diffServSchedulerEntry 3 } Baker, Chan, Smith Expires May 2001 [Page 75]
Internet Draft Differentiated Services MIB November 2000 diffServSchedulerSchdParam OBJECT-TYPE SYNTAX StaticRowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "This StaticRowPointer indicates the entry in diffServSchdParamTable the higher level scheduler, pointed to by diffServSchedulerNext, should use to service the output of this scheduler. This attribute is only used when there is more than one level of scheduler. And should have the value of zeroDotZero when not used." DEFVAL { zeroDotZero } ::= { diffServSchedulerEntry 4 } diffServSchedulerStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a queue. Any writable variable may be modified whether the row is active or notInService." ::= { diffServSchedulerEntry 5 } -- -- Scheduling Parameter Table -- -- The scheduling parameters are separate from the Queue Entries -- for reusability and for usage by both queues and schedulers, -- and this follows the separation of datapath elements from -- parameterization approach used throught out this MIB. -- Usage of scheduling parameter table entry by schedulers allow -- building of hierarchical scheduling. -- -- The diffServSchdParamMaxRateAbs/Rel attributes are used to -- construct non-work-conserving scheduler for the purpose of -- traffic shaping. These attributes limits the servicing of -- the queue/scheduler, in affect, shaping the output of the -- queue/scheduler, as described in [MODEL] section 7.2. -- diffServSchdParamNextFree OBJECT-TYPE Baker, Chan, Smith Expires May 2001 [Page 76]
Internet Draft Differentiated Services MIB November 2000 SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object yields a value when read that is currently unused for a diffServSchdParamId instance. If a configuring system attempts to create a new row in the diffServSchdParamTable using this value, that operation will fail if the value has, in the mean- time, been used to create another row that is currently valid." ::= { diffServScheduler 7 } diffServSchdParamTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServSchdParamEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Scheduling Parameter Table enumerates individual sets of scheduling parameter that can be used/reused by Queues and Schedulers." ::= { diffServScheduler 8 } diffServSchdParamEntry OBJECT-TYPE SYNTAX DiffServSchdParamEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the Scheduling Parameter Table describes a single set of scheduling parameter for use by queues and schedulers. Notice multiple inter-mixed of Queue and Scheduler entries can use the same Scheduler Parameter entry." INDEX { diffServSchdParamId } ::= { diffServSchdParamTable 1 } DiffServSchdParamEntry ::= SEQUENCE { diffServSchdParamId Unsigned32, diffServSchdParamPriority Unsigned32, diffServSchdParamMinRateAbs Unsigned32, diffServSchdParamMinRateRel Unsigned32, diffServSchdParamMaxRateAbs Unsigned32, diffServSchdParamMaxRateRel Unsigned32, Baker, Chan, Smith Expires May 2001 [Page 77]
Internet Draft Differentiated Services MIB November 2000 diffServSchdParamBurstSize BurstSize, diffServSchdParamStatus RowStatus } diffServSchdParamId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "An index that enumerates the Scheduler Parameter entries. The set of such identifiers spans the whole agent. Managers should obtain new values for row creation in this table by reading diffServSchdParam- NextFree." ::= { diffServSchdParamEntry 1 } diffServSchdParamPriority OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The priority of this queue, to be used as a parame- ter to the next scheduler element downstream from this one. A higher value means higher priority and should be serviced first." ::= { diffServSchdParamEntry 2 } diffServSchdParamMinRateAbs OBJECT-TYPE SYNTAX Unsigned32 UNITS "kilobits per second" MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum absolute rate, in kilobits/sec, that a downstream scheduler element should allocate to this queue. If the value is zero, then there is effec- tively no minimum rate guarantee. If the value is non-zero, the scheduler will assure the servicing of this queue to at least this rate. Note that this attribute's value is coupled to that of diffServSchdParamMinRateRel: changes to one will affect the value of the other. They are linked by the following equation: Baker, Chan, Smith Expires May 2001 [Page 78]
Internet Draft Differentiated Services MIB November 2000 diffServSchdParamMinRateRel = diffServSchdParamMinRateAbs * 10,000,000/ifSpeed or, if appropriate: diffServSchdParamMinRateRel = diffServSchdParamMinRateAbs * 10 / ifHighSpeed" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServSchdParamEntry 3 } diffServSchdParamMinRateRel OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The minimum rate that a downstream scheduler element should allocate to this queue, relative to the max- imum rate of the interface as reported by ifSpeed or ifHighSpeed, in units of 1/10,000 of 1. If the value is zero, then there is effectively no minimum rate guarantee. If the value is non-zero, the scheduler will assure the servicing of this queue to at least this rate. Note that this attribute's value is coupled to that of diffServSchdParamMinRateAbs: changes to one will affect the value of the other. They are linked by the following equation: diffServSchdParamMinRateAbs = ifSpeed * diffServSchdParamMinRateRel/10,000,000 or, if appropriate: diffServSchdParamMinRateAbs = ifHighSpeed * diffServSchdParamMinRateRel / 10" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServSchdParamEntry 4 } diffServSchdParamMaxRateAbs OBJECT-TYPE SYNTAX Unsigned32 UNITS "kilobits per second" MAX-ACCESS read-create Baker, Chan, Smith Expires May 2001 [Page 79]
Internet Draft Differentiated Services MIB November 2000 STATUS current DESCRIPTION "The maximum rate in kilobits/sec that a downstream scheduler element should allocate to this queue. If the value is zero, then there is effectively no max- imum rate limit and that the scheduler should attempt to be work-conserving for this queue. If the value is non-zero, the scheduler will limit the servicing of this queue to, at most, this rate in a non-work- conserving manner. Note that this attribute's value is coupled to that of diffServSchdParamMaxRateRel: changes to one will affect the value of the other. They are linked by the following equation: diffServSchdParamMaxRateRel = diffServSchdParamMaxRateAbs * 10,000,000/ifSpeed or, if appropriate: diffServSchdParamMaxRateRel = diffServSchdParamMaxRateAbs * 10 / ifHighSpeed" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServSchdParamEntry 5 } diffServSchdParamMaxRateRel OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum rate that a downstream scheduler element should allocate to this queue, relative to the max- imum rate of the interface as reported by ifSpeed or ifHighSpeed, in units of 1/10,000 of 1. If the value is zero, then there is effectively no maximum rate limit and the scheduler should attempt to be work- conserving for this queue. If the value is non-zero, the scheduler will limit the servicing of this queue to, at most, this rate in a non-work-conserving manner. Note that this attribute's value is coupled to that of diffServSchdParamMaxRateAbs: changes to one will affect the value of the other. They are linked by the Baker, Chan, Smith Expires May 2001 [Page 80]
Internet Draft Differentiated Services MIB November 2000 following equation: diffServSchdParamMaxRateAbs = ifSpeed * diffServSchdParamMaxRateRel/10,000,000 or, if appropriate: diffServSchdParamMaxRateAbs = ifHighSpeed * diffServSchdParamMaxRateRel / 10" REFERENCE "ifSpeed, ifHighSpeed from [IFMIB]" ::= { diffServSchdParamEntry 6 } diffServSchdParamBurstSize OBJECT-TYPE SYNTAX BurstSize UNITS "Bytes" MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum number of bytes in a single transmission burst. This attribute is used when diffServSchedu- lerMethod of a downstream Scheduler element is used for shaping traffic exiting this queue/scheduler." ::= { diffServSchdParamEntry 7 } diffServSchdParamStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The RowStatus variable controls the activation, deactivation, or deletion of a queue. Any writable variable may be modified whether the row is active or notInService." ::= { diffServSchdParamEntry 8 } -- -- MIB Compliance statements. -- diffServMIBCompliances OBJECT IDENTIFIER ::= { diffServMIBConformance 1 } diffServMIBGroups OBJECT IDENTIFIER ::= { diffServMIBConformance 2 } Baker, Chan, Smith Expires May 2001 [Page 81]
Internet Draft Differentiated Services MIB November 2000 diffServMIBCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "This MIB may be implemented as a read-only or as a read-create MIB. As a result, it may be used for mon- itoring or for configuration." MODULE -- This Module MANDATORY-GROUPS { diffServMIBDataPathGroup, diffServMIBClfrGroup, diffServMIBClfrElementGroup, diffServMIBSixTupleClfrGroup, diffServMIBActionGroup, diffServMIBAlgDropGroup, diffServMIBQGroup, diffServMIBSchedulerGroup, diffServMIBSchdParamGroup } -- The groups: -- diffServMIBCounterGroup -- diffServMIBHCCounterGroup -- diffServMIBVHCCounterGroup -- -- are mutually exclusive; at most one of these groups is implemented -- for a particular interface. When any of these groups is implemented -- for a particular interface, then ifCounterDiscontinuityGroup from -- [IFMIB] must also be implemented for that interface. -- note that the diffServMIBStaticGroup is -- mandatory for implementations that implement a -- read-write or read-create mode. GROUP diffServMIBCounterGroup DESCRIPTION "This group is mandatory for table objects indexed by ifIndex for which the value of the corresponding instance of ifSpeed is less than or equal to 20,000,000 bits/second." GROUP diffServMIBHCCounterGroup DESCRIPTION "This group is mandatory for table objects indexed by ifIndex for which the value of the corresponding instance of ifSpeed is greater than 20,000,000 Baker, Chan, Smith Expires May 2001 [Page 82]
Internet Draft Differentiated Services MIB November 2000 bits/second." GROUP diffServMIBVHCCounterGroup DESCRIPTION "This group is mandatory for table objects indexed by ifIndex for which the value of the corresponding instance of ifSpeed is greater than 650,000,000 bits/second." GROUP diffServMIBMeterGroup DESCRIPTION "This group is mandatory for devices that implement metering functions." GROUP diffServMIBTBMeterGroup DESCRIPTION "This group is mandatory for devices that implement token-bucket metering functions." GROUP diffServMIBDscpMarkActGroup DESCRIPTION "This group is mandatory for devices that implement DSCP-Marking functions." GROUP diffServMIBRandomDropGroup DESCRIPTION "This group is mandatory for devices that implement Random Drop functions." GROUP diffServMIBStaticGroup DESCRIPTION "This group is mandatory for devices that allow crea- tion of rows in any of the writable tables of this MIB." OBJECT diffServClfrStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 83]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServClfrElementOrder MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServClfrElementNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServClfrElementSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServClfrElementStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstAddrType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstAddr MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstAddrMask MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcAddrType MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 84]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServSixTupleClfrSrcAddr MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcAddrMask MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDscp MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrProtocol MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcL4PortMin MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrSrcL4PortMax MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstL4PortMin MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSixTupleClfrDstL4PortMax MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 85]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServSixTupleClfrStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterSucceedNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterFailNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServMeterStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServTBMeterType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServTBMeterRate MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServTBMeterBurstSize MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 86]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServTBMeterInterval MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServTBMeterStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionType MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServActionStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServCountActStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropType MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 87]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServAlgDropNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropQMeasure MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropQThreshold MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropSpecific MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServAlgDropStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMinThreshBytes MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMinThreshPkts MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropMaxThreshBytes MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 88]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServRandomDropMaxThreshPkts MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropInvProbMax MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropInvWeight MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropSamplingRate MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServRandomDropStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQSchdParam MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServQStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 89]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServSchedulerNext MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchedulerMethod MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchedulerSchdParam MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchedulerStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchdParamPriority MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchdParamMinRateAbs MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchdParamMinRateRel MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchdParamMaxRateAbs MIN-ACCESS read-only DESCRIPTION "Write access is not required." Baker, Chan, Smith Expires May 2001 [Page 90]
Internet Draft Differentiated Services MIB November 2000 OBJECT diffServSchdParamMaxRateRel MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchdParamBurstSize MIN-ACCESS read-only DESCRIPTION "Write access is not required." OBJECT diffServSchdParamStatus MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { diffServMIBCompliances 1 } diffServMIBDataPathGroup OBJECT-GROUP OBJECTS { diffServDataPathStart, diffServDataPathStatus } STATUS current DESCRIPTION "The Data Path Group defines the MIB Objects that describe a data path." ::= { diffServMIBGroups 1 } diffServMIBClfrGroup OBJECT-GROUP OBJECTS { diffServClfrStatus } STATUS current DESCRIPTION "The Classifier Group defines the MIB Objects that describe a generic classifier." ::= { diffServMIBGroups 2 } diffServMIBClfrElementGroup OBJECT-GROUP OBJECTS { diffServClfrElementOrder, diffServClfrElementNext, diffServClfrElementSpecific, diffServClfrElementStatus Baker, Chan, Smith Expires May 2001 [Page 91]
Internet Draft Differentiated Services MIB November 2000 } STATUS current DESCRIPTION "The Classifier Element Group defines the MIB Objects that describe the classifier elements that make up a generic classifier." ::= { diffServMIBGroups 3 } diffServMIBSixTupleClfrGroup OBJECT-GROUP OBJECTS { diffServSixTupleClfrDstAddrType, diffServSixTupleClfrDstAddr, diffServSixTupleClfrDstAddrMask, diffServSixTupleClfrSrcAddrType, diffServSixTupleClfrSrcAddr, diffServSixTupleClfrSrcAddrMask, diffServSixTupleClfrDscp, diffServSixTupleClfrProtocol, diffServSixTupleClfrDstL4PortMin, diffServSixTupleClfrDstL4PortMax, diffServSixTupleClfrSrcL4PortMin, diffServSixTupleClfrSrcL4PortMax, diffServSixTupleClfrStatus } STATUS current DESCRIPTION "The Six-tuple Classifier Group defines the MIB Objects that describe a classifier element for match- ing on 6 fields of an IP and upper-layer protocol header." ::= { diffServMIBGroups 4 } diffServMIBMeterGroup OBJECT-GROUP OBJECTS { diffServMeterSucceedNext, diffServMeterFailNext, diffServMeterSpecific, diffServMeterStatus } STATUS current DESCRIPTION "The Meter Group defines the objects used in describ- ing a generic meter element." ::= { diffServMIBGroups 5 } diffServMIBTBMeterGroup OBJECT-GROUP OBJECTS { diffServTBMeterType, diffServTBMeterRate, diffServTBMeterBurstSize, Baker, Chan, Smith Expires May 2001 [Page 92]
Internet Draft Differentiated Services MIB November 2000 diffServTBMeterInterval, diffServTBMeterStatus } STATUS current DESCRIPTION "The Token-Bucket Meter Group defines the objects used in describing a token bucket meter element." ::= { diffServMIBGroups 6 } diffServMIBActionGroup OBJECT-GROUP OBJECTS { diffServActionNext, diffServActionSpecific, diffServActionType, diffServActionStatus } STATUS current DESCRIPTION "The Action Group defines the objects used in describing a generic action element." ::= { diffServMIBGroups 7 } diffServMIBDscpMarkActGroup OBJECT-GROUP OBJECTS { diffServDscpMarkActDscp } STATUS current DESCRIPTION "The DSCP Mark Action Group defines the objects used in describing a DSCP Marking Action element." ::= { diffServMIBGroups 8 } diffServMIBCounterGroup OBJECT-GROUP OBJECTS { diffServCountActOctets, diffServCountActPkts, diffServCountActDiscontTime, diffServCountActStatus, diffServAlgDropOctets, diffServAlgDropPkts } STATUS current DESCRIPTION "A collection of objects providing information specific to non-high speed (non-high speed interfaces transmit and receive at speeds less than or equal to 20,000,000 bits/second) packet-oriented network Baker, Chan, Smith Expires May 2001 [Page 93]
Internet Draft Differentiated Services MIB November 2000 interfaces." ::= { diffServMIBGroups 9 } diffServMIBHCCounterGroup OBJECT-GROUP OBJECTS { diffServCountActOctets, diffServCountActHCOctets, diffServCountActPkts, diffServCountActDiscontTime, diffServCountActStatus, diffServAlgDropOctets, diffServAlgDropHCOctets, diffServAlgDropPkts } STATUS current DESCRIPTION "A collection of objects providing information specific to high speed (high speed interfaces transmit and receive at speeds greater than 20,000,000 but less than or equals to 650,000,000 bits/second) packet-oriented network interfaces." ::= { diffServMIBGroups 10 } diffServMIBVHCCounterGroup OBJECT-GROUP OBJECTS { diffServCountActOctets, diffServCountActHCOctets, diffServCountActPkts, diffServCountActHCPkts, diffServCountActDiscontTime, diffServCountActStatus, diffServAlgDropOctets, diffServAlgDropHCOctets, diffServAlgDropPkts, diffServAlgDropHCPkts } STATUS current DESCRIPTION "A collection of objects providing information specific to very-high speed (very-high speed inter- faces transmit and receive at speeds greater than 650,000,000 bits/second) packet-oriented network interfaces." ::= { diffServMIBGroups 11 } diffServMIBAlgDropGroup OBJECT-GROUP OBJECTS { diffServAlgDropType, diffServAlgDropNext, diffServAlgDropQMeasure, diffServAlgDropQThreshold, diffServAlgDropSpecific, diffServAlgDropStatus Baker, Chan, Smith Expires May 2001 [Page 94]
Internet Draft Differentiated Services MIB November 2000 } STATUS current DESCRIPTION "The Algorithmic Drop Group contains the objects that describe algorithmic dropper operation and configura- tion." ::= { diffServMIBGroups 12 } diffServMIBRandomDropGroup OBJECT-GROUP OBJECTS { diffServRandomDropMinThreshBytes, diffServRandomDropMinThreshPkts, diffServRandomDropMaxThreshBytes, diffServRandomDropMaxThreshPkts, diffServRandomDropInvProbMax, diffServRandomDropInvWeight, diffServRandomDropSamplingRate, diffServRandomDropStatus } STATUS current DESCRIPTION "The Random Drop Group augments the Algorithmic Drop Group for random dropper operation and configuration." ::= { diffServMIBGroups 13 } diffServMIBQGroup OBJECT-GROUP OBJECTS { diffServQNext, diffServQSchdParam, diffServQStatus } STATUS current DESCRIPTION "The Queue Group contains the objects that describe an interface's queues." ::= { diffServMIBGroups 14 } diffServMIBSchedulerGroup OBJECT-GROUP OBJECTS { diffServSchedulerNext, diffServSchedulerMethod, diffServSchedulerSchdParam, diffServSchedulerStatus } STATUS current DESCRIPTION "The Scheduler Group contains the objects that Baker, Chan, Smith Expires May 2001 [Page 95]
Internet Draft Differentiated Services MIB November 2000 describe packet schedulers on interfaces." ::= { diffServMIBGroups 15 } diffServMIBSchdParamGroup OBJECT-GROUP OBJECTS { diffServSchdParamPriority, diffServSchdParamMinRateAbs, diffServSchdParamMinRateRel, diffServSchdParamMaxRateAbs, diffServSchdParamMaxRateRel, diffServSchdParamBurstSize, diffServSchdParamStatus } STATUS current DESCRIPTION "The Scheduler Parameter Group contains the objects that describe packet schedulers' parameters on inter- faces." ::= { diffServMIBGroups 16 } diffServMIBStaticGroup OBJECT-GROUP OBJECTS { diffServClfrNextFree, diffServClfrElementNextFree, diffServSixTupleClfrNextFree, diffServMeterNextFree, diffServTBMeterNextFree, diffServActionNextFree, diffServCountActNextFree, diffServAlgDropNextFree, diffServRandomDropNextFree, diffServQNextFree, diffServSchedulerNextFree, diffServSchdParamNextFree } STATUS current DESCRIPTION "The Static Group contains readable scalar objects used in creating unique identifiers for classifiers, meters, actions and queues. These are required when- ever row creation operations on such tables are sup- ported." ::= { diffServMIBGroups 17 } END Baker, Chan, Smith Expires May 2001 [Page 96]
Internet Draft Differentiated Services MIB November 2000 8. Acknowledgments This MIB builds on all the work that has gone into the Informal Management Model for Diffserv routers, DiffServ PIB, and DiffServ Policy MIB (SNMPCONF WG). It has been developed with the active involvement of many people, but most notably Yoram Bernet, Steve Blake, Brian Carpenter, Dave Durham, Jeremy Greene, Dan Grossman, Roch Guerin, Scott Hahn, Keith McCloghrie, Bob Moore, Kathleen Nichols, Ping Pan, Nabil Seddigh, Bert Wijnen, Victor Firoiu, John Seligson, Michael Fine, Walter Weiss, Joel Halpern, and Harrie Hazewinkel. 9. Security Considerations It is clear that this MIB is potentially useful for configuration, and anything that can be configured can be misconfigured, with potentially disastrous effect. At this writing, no security holes have been identified beyond those that SNMP Security is itself intended to address. These relate primarily to controlled access to sensitive information and the ability to configure a device - or which might result from operator error, which is beyond the scope of any security architecture. There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. The use of SNMP Version 3 is recommended over prior versions for configuration control as its security model is improved. There are a number of managed objects in this MIB that may contain information that may be sensitive from a business perspective, in that they may represent a customer's service contract or the filters that the service provider chooses to apply to a customer's ingress or egress traffic. There are no objects which are sensitive in their own right, such as passwords or monetary amounts. It may be important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for Baker, Chan, Smith Expires May 2001 [Page 97]
Internet Draft Differentiated Services MIB November 2000 such a secure environment. SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB. It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User- based Security Model [12] and the View-based Access Control Model [15] is recommended. It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. 10. References [1] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2571, Cabletron Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research, April 1999 [2] Rose, M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", RFC 1155, STD 16, Performance Systems International, Hughes LAN Systems, May 1990 [3] Rose, M., and K. McCloghrie, "Concise MIB Definitions", RFC 1212, STD 16, Performance Systems International, Hughes LAN Systems, March 1991 [4] M. Rose, "A Convention for Defining Traps for use with the SNMP", RFC 1215, Performance Systems International, March 1991 [5] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", RFC 2578, STD 58, Cisco Systems, SNMPinfo, TU Braunschweig, SNMP Research, First Virtual Holdings, International Network Services, April 1999 [6] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Textual Conventions for SMIv2", RFC 2579, STD 58, Cisco Systems, SNMPinfo, TU Braunschweig, SNMP Research, First Virtual Holdings, International Network Services, April 1999 Baker, Chan, Smith Expires May 2001 [Page 98]
Internet Draft Differentiated Services MIB November 2000 [7] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Conformance Statements for SMIv2", RFC 2580, STD 58, Cisco Systems, SNMPinfo, TU Braunschweig, SNMP Research, First Virtual Holdings, International Network Services, April 1999 [8] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", RFC 1157, STD 15, SNMP Research, Performance Systems International, Performance Systems International, MIT Laboratory for Computer Science, May 1990. [9] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [10] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [11] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2572, SNMP Research, Inc., Cabletron Systems, Inc., BMC Software, Inc., IBM T. J. Watson Research, April 1999 [12] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2574, IBM T. J. Watson Research, April 1999 [13] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, SNMP Research, Inc., Cisco Systems, Inc., Dover Beach Consulting, Inc., International Network Services, January 1996. [14] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC 2573, SNMP Research, Inc., Secure Computing Corporation, Cisco Systems, April 1999 [15] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2575, IBM T. J. Watson Research, BMC Software, Inc., Cisco Systems, Inc., April 1999 [16] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction to Version 3 of the Internet-standard Network Management Framework", Baker, Chan, Smith Expires May 2001 [Page 99]
Internet Draft Differentiated Services MIB November 2000 RFC 2570, SNMP Research, Inc., TIS Labs at Network Associates, Inc., Ericsson, Cisco Systems, April 1999 [ACTQMGMT] V. Firoiu, M. Borden "A Study of Active Queue Management for Congestion Control", March 2000, In IEEE Infocom 2000, http://www.ieee-infocom.org/2000/papers/405.pdf [AQMROUTER] V.Misra, W.Gong, D.Towsley "Fuid-based analysis of a network of AQM routers supporting TCP flows with an application to RED", In SIGCOMM 2000, http://www.acm.org/sigcomm/sigcomm2000/conf/paper/sigcomm2000-4- 3.ps.gz [AF-PHB] J. Heinanen, F. Baker, W. Weiss, J. Wroclawski, "Assured Forwarding PHB Group.", RFC 2597, June 1999. [DSARCH] S. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss, "An Architecture for Differentiated Service", RFC 2475, December 1998. [DSFIELD] K. Nichols, S. Blake, F. Baker, D. Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", RFC 2474, December 1998. [DSPIB] M. Fine, K. McCloghrie, J. Seligson, K. Chan, S. Hahn, A. Smith, "Differentiated Services Policy Information Base", Internet Draft <draft-ietf-diffserv-pib-00.txt>, March 2000 [DSTERMS] D. Grossman, "New Terminology for Diffserv", Internet Draft <draft-ietf-diffserv-new-terms-02.txt>, November 1999. [EF-PHB] V. Jacobson, K. Nichols, K. Poduri, "An Expedited Forwarding PHB." RFC 2598, June 1999. [IFMIB] K. McCloghrie, F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2233, November 1997. [INETADDRESS] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder, J., Baker, Chan, Smith Expires May 2001 [Page 100]
Internet Draft Differentiated Services MIB November 2000 "Textual Conventions for Internet Network Addresses.", RFC 2851, June 2000. [INTSERVMIB] F. Baker, J. Krawczyk, A. Sastry, "Integrated Services Management Information Base using SMIv2", RFC 2213, September 1997. [MODEL] Y. Bernet, S. Blake, A. Smith, D. Grossman, "An Informal Management Model for Diffserv Routers", Internet Draft <draft-ietf-diffserv- model-04.txt>, July 2000. [POLTERM] F. Reichmeyer, D. Grossman, J. Strassner, M. Condell, "A Common Terminology for Policy Management", Internet Draft <draft- reichmeyer-polterm-terminology-00.txt>, March 2000 [QUEUEMGMT] B. Braden et al., "Recommendations on Queue Management and Congestion Avoidance in the Internet", RFC 2309, April 1998. [RED93] "Random Early Detection", 1993. [SRTCM] J. Heinanen, R. Guerin, "A Single Rate Three Color Marker", RFC 2697, September 1999. [TRTCM] J. Heinanen, R. Guerin, "A Two Rate Three Color Marker", RFC 2698, September 1999. [TSWTCM] W. Fang, N. Seddigh, B. Nandy "A Time Sliding Window Three Colour Marker", RFC 2859, June 2000. 11. Authors' Addresses Fred Baker Cisco Systems 519 Lado Drive Santa Barbara, California 93111 fred@cisco.com Baker, Chan, Smith Expires May 2001 [Page 101]
Internet Draft Differentiated Services MIB November 2000 Kwok Ho Chan Nortel Networks 600 Technology Park Drive Billerica, MA 01821 khchan@nortelnetworks.com Andrew Smith Allegro Networks 6399 San Ignacio Ave San Jose, CA 95119 andrew@allegronetworks.com Table of Contents 1 The SNMP Management Framework ................................... 2 2 Introduction .................................................... 4 2.1 Relationship to the Diffserv Informal Management Model ........ 4 2.2 Relationship to other MIBs and Policy Management .............. 5 2.3 MIB Overview .................................................. 5 3 Structure of this MIB ........................................... 6 3.1 DiffServ Data Paths ........................................... 7 3.1.1 Data Path Table ............................................. 7 3.2 Classifiers ................................................... 8 3.2.1 Classifier Table ............................................ 9 3.2.2 Classifier Element Table .................................... 9 3.2.3 Filter Table - IP Six-Tuple Classifier Table ................ 9 3.3 Meters ........................................................ 9 3.3.1 Meter Table ................................................. 10 3.3.2 Token-Bucket Meter Table .................................... 10 3.4 Actions ....................................................... 10 3.4.1 DSCP Mark Action Table ...................................... 11 3.4.2 Count Action Table .......................................... 11 3.4.3 Absolute Drop Action ........................................ 11 3.5 Queueing Elements ............................................. 11 3.5.1 Algorithmic Dropper Table ................................... 12 3.5.2 Random Dropper Table ........................................ 13 3.5.3 Queues and Schedulers ....................................... 14 4 MIB Usage Example ............................................... 16 4.1 Model's Example ............................................... 16 4.2 Additional Data Path Example .................................. 19 4.2.1 Data Path and Classifier Example Discussion ................. 19 4.2.2 Meter and Action Example Discussion ......................... 22 4.2.3 Queue and Scheduler Example Discussion ...................... 23 Baker, Chan, Smith Expires May 2001 [Page 102]
Internet Draft Differentiated Services MIB November 2000 5 Conventions used in this MIB .................................... 23 5.1 The use of RowPointer ......................................... 23 5.2 The use of StaticRowPointer ................................... 24 5.3 Conceptual row creation and deletion .......................... 24 6 Extending this MIB .............................................. 25 7 MIB Definition .................................................. 26 8 Acknowledgments ................................................. 97 9 Security Considerations ......................................... 97 10 References ..................................................... 98 11 Authors' Addresses ............................................. 101 Baker, Chan, Smith Expires May 2001 [Page 103]
Internet Draft Differentiated Services MIB November 2000 12. Full Copyright Copyright (C) The Internet Society (2000). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implmentation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Baker, Chan, Smith Expires May 2001 [Page 104]