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    Express Connect:CheckAddRegionToExpressConnectRouter

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    Express Connect:CheckAddRegionToExpressConnectRouter

    Last Updated:Nov 28, 2025

    Checks the Cloud Data Transfer (CDT) service, which is required to add a region to an Express Connect Router (ECR).

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    RAM authorization

    The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

    • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

    • API: The API that you can call to perform the action.

    • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

    • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

      • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

      • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

    • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

    • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

    Action

    Access level

    Resource type

    Condition key

    Dependent action

    expressconnectrouter:CheckAddRegionToExpressConnectRouter

    none

    *ExpressConnectRouter

    acs:expressconnectrouter::{#accountId}:expressconnectrouter/{#EcrId}

    		 None None

    Request parameters

    Parameter

    Type

    Required

    Description

    Example
    EcrId

    string

    Yes

    The ID of ECR.

    ecr-fu8rszhgv7623c****
    FreshRegionId

    string

    Yes

    The ID of the region that you want to add to ECR.

    cn-hangzhou
    DryRun

    boolean

    No

    Specifies whether to perform a dry run. Valid values:

    • true: performs a dry run to check the request. No service resources are modified.

    • false (default): sends a normal request.

    false
    ClientToken

    string

    No

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

    Generate a unique token on your client. The token can contain only ASCII characters.

    Note

    If you do not specify this parameter, the system uses the RequestId as the ClientToken. The RequestId of each API request may be different.

    02fb3da4-130e-11e9-8e44-00****

    Response elements

    Element

    Type

    Description

    Example

    object

    RpcResponse

    RequestId

    string

    The request ID.

    6FABF516-FED3-5697-BDA2-B18C5D9A****
    Success

    boolean

    Indicates whether the call was successful. Valid values:

    • true: The call was successful.

    • false: The call failed.

    True
    Code

    string

    The status code. A value of 200 indicates that the call was successful. For information about other error codes, see the "Error codes" section.

    200
    Message

    string

    The returned message.

    OK
    HttpStatusCode

    integer

    The HTTP status code.

    200
    DynamicCode

    string

    The dynamic error code.

    IllegalParamFormat.EcrId
    DynamicMessage

    string

    The dynamic error message. This message is used to replace the %s placeholder in the error message.

    Note

    If the ErrMessage parameter returns The Value of Input Parameter %s is not valid and this parameter returns DtsInstanceId, it means that the DtsInstanceId parameter is invalid.

    The param format of EcrId **** is illegal.
    AccessDeniedDetail

    string

    The details about the access denial.

    Authentication is failed for ****
    IsCdtInterRegionEnabled

    boolean

    Indicates whether the CDT service is enabled for the account to which the ECR instance belongs. Valid values:

    • true: Yes.

    • false: No.

    true
    IsCdtCrossBorderEnabled

    boolean

    Indicates whether the cross-border CDT service is enabled for the account to which the ECR instance belongs. Valid values:

    • true: Yes.

    • false: No.

    true

    Examples

    Success response

    JSON format

    {
  "RequestId": "6FABF516-FED3-5697-BDA2-B18C5D9A****",
  "Success": true,
  "Code": "200",
  "Message": "OK",
  "HttpStatusCode": 200,
  "DynamicCode": "IllegalParamFormat.EcrId",
  "DynamicMessage": "The param format of EcrId **** is illegal.",
  "AccessDeniedDetail": "Authentication is failed for ****",
  "AnyInterRegionLink": true,
  "AnyCrossBorderLink": true,
  "IsCdtInterRegionEnabled": true,
  "IsCdtCrossBorderEnabled": true,
  "IsUserAllowedToCreateCrossBorderLink": true
}

    Error codes

    HTTP status code

    Error code

    Error message

    Description
    400 UnsupportedRegion Feature not supported in specified region. The specified region does not support the leased line gateway function.
    400 MissingParam.%s The param of %s is missing. The request parameters are not specified. Please check the corresponding parameters and try again.
    400 IllegalParamFormat.%s The param format of %s is illegal. Illegal parameter format
    400 Conflict.Lock There are other unfinished operations. You currently have other unfinished operations, please try again later
    400 InternalErrorTemp The request processing has failed due to some unknown error. The request processing has failed due to some unknown error.
    404 ResourceNotFound.EcrId EcrId not found. ECR instance does not exist

    See Error Codes for a complete list.

    Release notes

    See Release Notes for a complete list.