DescribeInstanceTopology - Amazon Elastic Compute Cloud
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Describes a tree-based hierarchy that represents the physical host placement of your EC2 instances within an Availability Zone or Local Zone. You can use this information to determine the relative proximity of your EC2 instances within the Amazon network to support your tightly coupled workloads.

  • Supported zones

    • Availability Zone

    • Local Zone

  • Supported instance types

    • hpc6a.48xlarge | hpc6id.32xlarge | hpc7a.12xlarge | hpc7a.24xlarge | hpc7a.48xlarge | hpc7a.96xlarge | hpc7g.4xlarge | hpc7g.8xlarge | hpc7g.16xlarge

    • p3dn.24xlarge | p4d.24xlarge | p4de.24xlarge | p5.48xlarge

    • trn1.2xlarge | trn1.32xlarge | trn1n.32xlarge

For more information, see Amazon EC2 instance topology in the Amazon EC2 User Guide.

Request Parameters

The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see Common Query Parameters.


Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation. Otherwise, it is UnauthorizedOperation.

Type: Boolean

Required: No


The filters.

  • availability-zone - The name of the Availability Zone (for example, us-west-2a) or Local Zone (for example, us-west-2-lax-1b) that the instance is in.

  • instance-type - The instance type (for example, p4d.24xlarge) or instance family (for example, p4d*). You can use the * wildcard to match zero or more characters, or the ? wildcard to match zero or one character.

  • zone-id - The ID of the Availability Zone (for example, usw2-az2) or Local Zone (for example, usw2-lax1-az1) that the instance is in.

Type: Array of Filter objects

Required: No


The name of the placement group that each instance is in.

Constraints: Maximum 100 explicitly specified placement group names.

Type: Array of strings

Required: No


The instance IDs.

Default: Describes all your instances.

Constraints: Maximum 100 explicitly specified instance IDs.

Type: Array of strings

Required: No


The maximum number of items to return for this request. To get the next page of items, make another request with the token returned in the output. For more information, see Pagination.

You can't specify this parameter and the instance IDs parameter in the same request.

Default: 20

Type: Integer

Valid Range: Minimum value of 1. Maximum value of 100.

Required: No


The token returned from a previous paginated request. Pagination continues from the end of the items returned by the previous request.

Type: String

Required: No

Response Elements

The following elements are returned by the service.


Information about the topology of each instance.

Type: Array of InstanceTopology objects


The token to include in another request to get the next page of items. This value is null when there are no more items to return.

Type: String


The ID of the request.

Type: String


For information about the errors that are common to all actions, see Common client error codes.

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: