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Cloud Enterprise Network:AssociateTransitRouterAttachmentWithRouteTable

Last Updated:Mar 25, 2024

Creates an associated forwarding correlation.

Operation description

After you create a network instance connection on a transit router, you can configure an associated forwarding correlation to associate the network instance connection with the route table of an Enterprise Edition transit router. The Enterprise Edition transit router forwards traffic for the network instance based on the routes in the route table. Before you begin, we recommend that you take note of the following rules:

  • Only route tables of Enterprise Edition transit routers support associated forwarding correlations. For more information about the regions and zones that support Enterprise Edition transit routers, see What is CEN?

  • Each network instance connection can have an associated forwarding correlation with only one route table of only one Enterprise Edition transit router.

  • AssociateTransitRouterAttachmentWithRouteTable is an asynchronous operation. After a request is sent, the system returns a request ID and runs the task in the background. You can call the ListTransitRouterRouteTableAssociations operation to query the status of an associated forwarding correlation.

    • If an associated forwarding correlation is in the Associating state, the associated forwarding correlation is being created. You can query the associated forwarding correlation but cannot perform other operations.
    • If an associated forwarding correlation is in the Active state, the associated forwarding correlation is created.


OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

  • Operation: the value that you can use in the Action element to specify the operation on a resource.
  • Access level: the access level of each operation. The levels are read, write, and list.
  • Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
    • The required resource types are displayed in bold characters.
    • If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
  • Condition Key: the condition key that is defined by the cloud service.
  • Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.
OperationAccess levelResource typeCondition keyAssociated operation
  • TransitRouterPeerAttachment

Request parameters


The ID of the network instance connection.


The ID of the route table of the Enterprise Edition transit router.


The client token that is used to ensure the idempotence of the request.

You can use the client to generate the token, but you must make sure that the token is unique among different requests. The token can contain only ASCII characters.

Note If you do not specify this parameter, the system automatically uses the request ID as the client token. The request ID is different for each request.

Specifies whether to perform only a dry run, without performing the actual request. Valid values:

  • false (default): performs a dry run and performs the actual request. If the request passes the dry run, a 2xx HTTP status code is returned and the operation is performed.
  • true: performs only a dry run. The system checks the request for potential issues, including missing parameter values, incorrect request syntax, and service limits. If the request fails the dry run, an error message is returned. If the request passes the dry run, the DryRunOperation error code is returned.

Response parameters


The ID of the request.



Sample success responses


  "RequestId": "4EC47282-1B74-4534-BD0E-403F3EE64CAF"

Error codes

HTTP status codeError codeError messageDescription
400AssociationExist.TransitRouterTableThe specified association already exists.The error message returned because the specified route table is already associated with an associated forwarding correlation.
400IllegalParam.TransitRouterTableTypeWhen peer attachment is associated with a custom routeTable, the Transit Router in both regions must be enterprise.The error message returned because both the local and peer transit routers must be of Enterprise Edition when you associate the inter-region connection with a route table.
400OperationFailed.TransitRouterTypeOperation failed because transit router type not support this operation.The error message returned because this operation is not support by the specified type of transit router.
400IncorrectStatus.AttachmentOrRouteTableThe resource is not in a valid state for the operation.The error message returned because this operation is not supported when the specified attachment or route table is in an unstable state. Try again later.
400IllegalParam.TransitRouterTableIdThe specified TransitRouterTableId is invalid.The error message returned because the TransitRouterTableId parameter is set to an invalid value.
400OperationUnsupported.AssociateThe specified attachment or routeTable is not supported by this operation.The error message returned because this operation is not supported by the specified attachment or route table.
400InvalidParameterInvalid parameter.The error message returned because the parameter is set to an invalid value.
400UnauthorizedThe AccessKeyId is unauthorized.The error message returned because you do not have the permissions to perform this operation.
404InvalidRouteTableId.NotFoundThe specified RouteTableId is not found.The specified route table ID does not exist.
404InvalidAttachmentId.NotFoundThe specified AttachmentId is not found.The error message returned because the specified network instance connection ID does not exist.

For a list of error codes, visit the Service error codes.

Change history

Change timeSummary of changesOperation
2023-01-04The Error code has changedsee changesets
Change itemChange content
Error CodesThe Error code has changed.
    Error Codes 400 change
    delete Error Codes: 404