This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html). # AWS::EC2::IPAMPrefixListResolver IpamPrefixListResolverRuleCondition Describes a condition within a CIDR selection rule. Conditions define the criteria for selecting CIDRs from IPAM's database based on resource attributes. CIDR selection rules define the business logic for selecting CIDRs from IPAM. If a CIDR matches any of the rules, it will be included. If a rule has multiple conditions, the CIDR has to match every condition of that rule. You can create a prefix list resolver without any CIDR selection rules, but it will generate empty versions (containing no CIDRs) until you add rules. There are three rule types. Only 2 of the 3 rule types support conditions - **IPAM pool CIDR** and **Scope resource CIDR**. **Static CIDR** rules cannot have conditions. + **Static CIDR**: A fixed list of CIDRs that do not change (like a manual list replicated across Regions) + **IPAM pool CIDR**: CIDRs from specific IPAM pools (like all CIDRs from your IPAM production pool) If you choose this option, choose the following: + **IPAM scope**: Select the IPAM scope to search for resources + **Conditions:** + **Property** + **IPAM pool ID**: Select an IPAM pool that contains the resources + **CIDR** (like 10.24.34.0/23) + **Operation**: Equals/Not equals + **Value**: The value on which to match the condition + **Scope resource CIDR**: CIDRs from AWS resources like VPCs, subnets, EIPs within an IPAM scope If you choose this option, choose the following: + **IPAM scope**: Select the IPAM scope to search for resources + **Resource type**: Select a resource, like a VPC or subnet. + **Conditions**: + **Property**: + Resource ID: The unique ID of a resource (like vpc-1234567890abcdef0) + Resource owner (like 111122223333) + Resource region (like us-east-1) + Resource tag (like key: name, value: dev-vpc-1) + CIDR (like 10.24.34.0/23) + **Operation**: Equals/Not equals + **Value**: The value on which to match the condition ## Syntax To declare this entity in your CloudFormation template, use the following syntax: ### JSON ``` { "[Cidr](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-cidr)" : {{String}}, "[IpamPoolId](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-ipampoolid)" : {{String}}, "[Operation](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-operation)" : {{String}}, "[ResourceId](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourceid)" : {{String}}, "[ResourceOwner](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourceowner)" : {{String}}, "[ResourceRegion](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourceregion)" : {{String}}, "[ResourceTag](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourcetag)" : {{Tag}} } ``` ### YAML ``` [Cidr](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-cidr): {{String}} [IpamPoolId](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-ipampoolid): {{String}} [Operation](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-operation): {{String}} [ResourceId](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourceid): {{String}} [ResourceOwner](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourceowner): {{String}} [ResourceRegion](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourceregion): {{String}} [ResourceTag](#cfn-ec2-ipamprefixlistresolver-ipamprefixlistresolverrulecondition-resourcetag): {{ Tag}} ``` ## Properties `Cidr` A CIDR block to match against. This condition selects CIDRs that fall within or match the specified CIDR range. *Required*: No *Type*: String *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) `IpamPoolId` The ID of the IPAM pool to match against. This condition selects CIDRs that belong to the specified IPAM pool. *Required*: No *Type*: String *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) `Operation` The operation to perform when evaluating this condition. Valid values include `equals`, `not-equals`, and `subnet-of`. *Required*: No *Type*: String *Allowed values*: `equals | not-equals | subnet-of` *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) `ResourceId` The ID of the AWS resource to match against. This condition selects CIDRs associated with the specified resource. *Required*: No *Type*: String *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) `ResourceOwner` The AWS account ID that owns the resources to match against. This condition selects CIDRs from resources owned by the specified account. *Required*: No *Type*: String *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) `ResourceRegion` The AWS Region where the resources are located. This condition selects CIDRs from resources in the specified Region. *Required*: No *Type*: String *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt) `ResourceTag` A tag key-value pair to match against. This condition selects CIDRs from resources that have the specified tag. *Required*: No *Type*: [Tag](aws-properties-ec2-ipamprefixlistresolver-tag.md) *Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

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