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侠影萍踪/Openvswitch

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README
Apache-2.0

Open vSwitch

https://ci.appveyor.com/api/projects/status/github/openvswitch/ovs?branch=master&svg=true&retina=true What is Open vSwitch?

Open vSwitch is a multilayer software switch licensed under the open source Apache 2 license. Our goal is to implement a production quality switch platform that supports standard management interfaces and opens the forwarding functions to programmatic extension and control.

Open vSwitch is well suited to function as a virtual switch in VM environments. In addition to exposing standard control and visibility interfaces to the virtual networking layer, it was designed to support distribution across multiple physical servers. Open vSwitch supports multiple Linux-based virtualization technologies including Xen/XenServer, KVM, and VirtualBox.

The bulk of the code is written in platform-independent C and is easily ported to other environments. The current release of Open vSwitch supports the following features:

  • Standard 802.1Q VLAN model with trunk and access ports
  • NIC bonding with or without LACP on upstream switch
  • NetFlow, sFlow(R), and mirroring for increased visibility
  • QoS (Quality of Service) configuration, plus policing
  • Geneve, GRE, VXLAN, STT, and LISP tunneling
  • 802.1ag connectivity fault management
  • OpenFlow 1.0 plus numerous extensions
  • Transactional configuration database with C and Python bindings
  • High-performance forwarding using a Linux kernel module

The included Linux kernel module supports Linux 3.10 and up.

Open vSwitch can also operate entirely in userspace without assistance from a kernel module. This userspace implementation should be easier to port than the kernel-based switch. OVS in userspace can access Linux or DPDK devices. Note Open vSwitch with userspace datapath and non DPDK devices is considered experimental and comes with a cost in performance.

What's here?

The main components of this distribution are:

  • ovs-vswitchd, a daemon that implements the switch, along with a companion Linux kernel module for flow-based switching.
  • ovsdb-server, a lightweight database server that ovs-vswitchd queries to obtain its configuration.
  • ovs-dpctl, a tool for configuring the switch kernel module.
  • Scripts and specs for building RPMs for Citrix XenServer and Red Hat Enterprise Linux. The XenServer RPMs allow Open vSwitch to be installed on a Citrix XenServer host as a drop-in replacement for its switch, with additional functionality.
  • ovs-vsctl, a utility for querying and updating the configuration of ovs-vswitchd.
  • ovs-appctl, a utility that sends commands to running Open vSwitch daemons.

Open vSwitch also provides some tools:

  • ovs-ofctl, a utility for querying and controlling OpenFlow switches and controllers.
  • ovs-pki, a utility for creating and managing the public-key infrastructure for OpenFlow switches.
  • ovs-testcontroller, a simple OpenFlow controller that may be useful for testing (though not for production).
  • A patch to tcpdump that enables it to parse OpenFlow messages.

What other documentation is available?

To install Open vSwitch on a regular Linux or FreeBSD host, please read the installation guide. For specifics around installation on a specific platform, refer to one of the other installation guides

For answers to common questions, refer to the FAQ.

To learn about some advanced features of the Open vSwitch software switch, read the tutorial.

Each Open vSwitch userspace program is accompanied by a manpage. Many of the manpages are customized to your configuration as part of the build process, so we recommend building Open vSwitch before reading the manpages.

License

The following is a summary of the licensing of files in this distribution. As mentioned, Open vSwitch is licensed under the open source Apache 2 license. Some files may be marked specifically with a different license, in which case that license applies to the file in question.

Files under the datapath directory are licensed under the GNU General Public License, version 2.

File build-aux/cccl is licensed under the GNU General Public License, version 2.

The following files are licensed under the 2-clause BSD license.
include/windows/getopt.h lib/getopt_long.c lib/conntrack-tcp.c
The following files are licensed under the 3-clause BSD-license
include/windows/netinet/icmp6.h include/windows/netinet/ip6.h lib/strsep.c

Files under the xenserver directory are licensed on a file-by-file basis. Refer to each file for details.

Files lib/sflow*.[ch] are licensed under the terms of either the Sun Industry Standards Source License 1.1, that is available at:

http://www.inmon.com/technology/sflowlicense.txt

Contact

bugs@openvswitch.org

Apache License Version 2.0, January 2004 https://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. 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You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License. 8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability. END OF TERMS AND CONDITIONS Copyright The Open vSwitch Authors Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 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简介

Open vSwitch 是一款高质量的多层虚拟交换机,旨在通过编程扩展实现大规模网络自动化,同时仍然支持标准管理接口和协议(如 NetFlow、sFlow、IPFIX、RSPAN、CLI、LACP、802.1ag)。
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