All Products
Search
Document Center

Cloud Enterprise Network:ListTransitRouterVpcAttachments

Last Updated:Sep 02, 2026

Queries information about Virtual Private Cloud (VPC) connections under an Enterprise Edition transit router, including the status, billing type, zone information, and associated vSwitch and network interface controller (NIC) details of VPC connections that are active for forwarding and routing traffic.

Operation description

You can query information about VPC connections under an Enterprise Edition transit router in the following three ways:

  • Query information about all VPC connections under an Enterprise Edition transit router instance by specifying the transit router instance ID.

  • Query information about all VPC connections under an Enterprise Edition transit router instance by specifying the Cloud Enterprise Network (CEN) instance ID and the region ID of the Enterprise Edition transit router instance.

  • Query information about all VPC connections in a region by specifying the region ID of the Enterprise Edition transit router instance.

Try it now

Try this API in OpenAPI Explorer, no manual signing needed. Successful calls auto-generate SDK code matching your parameters. Download it with built-in credential security for local usage.

Test

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

cen:ListTransitRouterVpcAttachments

list

*CenInstance

acs:cen:*:{#accountId}:ceninstance/{#ceninstanceId}

TransitRouterVpcAttachment

acs:cen:*:{#accountId}:centransitrouterattachment/*

TransitRouterVpcAttachment

acs:cen:*:{#accountId}:centransitrouterattachment/{#centransitrouterattachmentId}

None None

Request parameters

Parameter

Type

Required

Description

Example

CenId

string

No

The CEN instance ID.

cen-j3jzhw1zpau2km****

RegionId

string

No

The region ID of the Enterprise Edition transit router instance.

You can call the DescribeRegions operation to query the region ID.

cn-hangzhou

TransitRouterAttachmentId

string

No

The VPC connection ID.

tr-attach-nls9fzkfat8934****

TransitRouterId

string

No

The Enterprise Edition transit router instance ID.

tr-bp1su1ytdxtataupl****

MaxResults

integer

No

The number of entries per page for a paged query. Default value: 20.

20

NextToken

string

No

The token for the next query. Valid values:

  • You do not need to specify this parameter for the first query or if no next query exists.

  • If a next query exists, set this parameter to the NextToken value returned by the previous API call.

FFmyTO70tTpLG6I3FmYAXGKPd****

Tag

array<object>

No

The tag information.

You can specify up to 20 tags at a time.

object

No

Key

string

No

The tag key of the resource.

Once specified, the tag key cannot be an empty string. The tag key can be up to 64 characters in length and cannot start with aliyun or acs:. It cannot contain http:// or https://.

You can specify up to 20 tag keys at a time.

tagtest

Value

string

No

The tag value of the resource.

The tag value can be empty or a string of up to 128 characters. It cannot start with aliyun or acs: and cannot contain http:// or https://.

Each tag key corresponds to one tag value. You can specify up to 20 tag values at a time.

tagtest

VpcId

string

No

The VPC instance ID.

vpc-bp1kbjcre9vtsebo1****

OrderType

string

No

The payer of the network instance. Valid values:

  • PayByCenOwner: The fees generated by the network instance are paid by the account that owns the CEN instance.

  • PayByResourceOwner: The fees generated by the network instance are paid by the account that owns the network instance.

PayByCenOwner

Status

string

No

The attachment status of the network instance.

  • Attaching: being attached.

  • Attached: attached.

  • Detaching: being detached.

Attached

Response elements

Element

Type

Description

Example

object

The response parameters.

NextToken

string

The token for the next query. Valid values:

  • If NextToken is empty, no next query exists.

  • If NextToken is returned, the value indicates the token for the next query.

FFmyTO70tTpLG6I3FmYAXGKPd****

RequestId

string

The request ID.

C97FF53F-3EF8-4883-B459-60E171924B23

TotalCount

integer

The total number of entries.

1

MaxResults

integer

The number of entries per page for a paged query.

20

TransitRouterAttachments

array<object>

The list of VPC connections.

array<object>

The list of VPC connections.

CreationTime

string

The time when the VPC connection was created.

The time is displayed in the ISO 8601 standard in UTC. Format: YYYY-MM-DDThh:mmZ.

2021-06-15T02:14Z

Status

string

The status of the VPC connection.

  • Attached: attached.

  • Attaching: being attached.

  • Detaching: being detached.

Attached

VpcId

string

The VPC instance ID.

vpc-bp1h8vbrbcgohcju5****

TransitRouterAttachmentId

string

The VPC connection ID.

tr-attach-nls9fzkfat8934****

TransitRouterId

string

The Enterprise Edition transit router instance ID.

tr-bp1su1ytdxtataupl****

ResourceType

string

The resource type of the connection.

The value is VPC, which indicates a VPC instance.

VPC

TransitRouterAttachmentDescription

string

The description of the VPC connection.

testdesc

VpcOwnerId

integer

The ID of the account that owns the VPC instance.

1250123456123456

VpcRegionId

string

The region ID of the VPC instance.

cn-hangzhou

TransitRouterAttachmentName

string

The name of the VPC connection.

testname

ZoneMappings

array<object>

The zone information of the VPC connection and the vSwitch and network interface controller (NIC) information of the associated VPC instance that are active for forwarding and routing traffic.

object

ZoneId

string

The zone ID.

cn-hangzhou-h

VSwitchId

string

The vSwitch ID.

vsw-bp1a214sbus8z3b54****

NetworkInterfaceId

string

The ID of the network interface controller (NIC) that the Enterprise Edition transit router created in the vSwitch for forwarding and routing traffic.

eni-bp149hmyaqegerml****

AutoPublishRouteEnabled

boolean

Indicates whether the Enterprise Edition transit router automatically publishes route entries to the VPC instance.

  • false: The forward router does not automatically publish route entries.

  • true: The forward router automatically publishes route entries.

true

ChargeType

string

The billing type of the VPC connection.

The value is POSTPAY, which indicates pay-as-you-go.

POSTPAY

Tags

array<object>

The tag information.

object

Key

string

The tag key.

test

Value

string

The tag value.

test

OrderType

string

The payer of the network instance. Valid values:

  • PayByCenOwner: The fees generated by the network instance are paid by the account that owns the CEN instance.

  • PayByResourceOwner: The fees generated by the network instance are paid by the account that owns the network instance.

PayByCenOwner

ManagedService

string

The cloud service to which the connection belongs.

SAS

TransitRouterVPCAttachmentOptions

object

The list of feature attributes of the VPC connection (to be deprecated. Use the new parameter Options instead).

string

The feature attribute of the VPC connection (to be deprecated. Use the new parameter Options instead).

  • ipv6Support: indicates whether IPv6 is enabled. The default value is the current IPv6 status of the VPC connection.

    • enable: IPv6 is enabled.

    • disable: IPv6 is disabled.

{ "ipv6Support": "disable" }

CenId

string

The CEN instance ID.

cen-j3jzhw1zpau2km****

Options

object

The collection of feature attributes.

Ipv6Support

string

Indicates whether IPv6 is supported.

  • disable (default): No.

  • enable: Yes.

enable

ApplianceModeSupport

string

Indicates whether the appliance mode is enabled.

  • disable (default): No.

  • enable: Yes.

enable

Examples

Success response

JSON format

{
  "NextToken": "FFmyTO70tTpLG6I3FmYAXGKPd****",
  "RequestId": "C97FF53F-3EF8-4883-B459-60E171924B23",
  "TotalCount": 1,
  "MaxResults": 20,
  "TransitRouterAttachments": [
    {
      "CreationTime": "2021-06-15T02:14Z",
      "Status": "Attached",
      "VpcId": "vpc-bp1h8vbrbcgohcju5****",
      "TransitRouterAttachmentId": "tr-attach-nls9fzkfat8934****",
      "TransitRouterId": "tr-bp1su1ytdxtataupl****",
      "ResourceType": "VPC",
      "TransitRouterAttachmentDescription": "testdesc",
      "VpcOwnerId": 1250123456123456,
      "VpcRegionId": "cn-hangzhou",
      "TransitRouterAttachmentName": "testname",
      "ZoneMappings": [
        {
          "ZoneId": "cn-hangzhou-h",
          "VSwitchId": "vsw-bp1a214sbus8z3b54****",
          "NetworkInterfaceId": "eni-bp149hmyaqegerml****"
        }
      ],
      "AutoPublishRouteEnabled": true,
      "ChargeType": "POSTPAY",
      "Tags": [
        {
          "Key": "test",
          "Value": "test"
        }
      ],
      "OrderType": "PayByCenOwner",
      "ManagedService": "SAS",
      "TransitRouterVPCAttachmentOptions": {
        "key": "{ \"ipv6Support\": \"disable\" }"
      },
      "CenId": "cen-j3jzhw1zpau2km****\n",
      "Options": {
        "Ipv6Support": "enable",
        "ApplianceModeSupport": "enable"
      }
    }
  ]
}

Error codes

HTTP status code

Error code

Error message

Description

400 IllegalParam.NextToken The specified NextToken is invalid. The error message returned because the NextToken parameter is set to an invalid value.
400 IllegalParam.TrInstance The specified TransitRouter is invalid. The error message returned because the TransitRouter parameter is set to an invalid value.
400 IllegalParam.Region The specified Region is invalid. The error message returned because the specified region is invalid.
400 IllegalParam.CenId The specified CenId is invalid. The error message returned because the ID of the CEN instance is invalid.
400 IllegalParam.TransitRouterId The specified TransitRouterId is invalid. The error message returned because the specified transit router ID is invalid.
400 IllegalParam.CenIdOrRegionId The specified CenId or RegionId is invalid. The error message returned because the specified CEN instance ID or region ID is invalid.
400 IllegalParam.MaxResults The specified MaxResults is illegal. MaxResults illegal.
400 InvalidParameter Invalid parameter. The error message returned because the parameter is set to an invalid value.
400 Unauthorized The AccessKeyId is unauthorized. The error message returned because you do not have the permissions to perform this operation.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.