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Express Connect:ModifyBgpGroupAttribute

Last Updated:Aug 28, 2026

Modifies the configuration of a Border Gateway Protocol (BGP) group.

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Test

RAM authorization

No authorization for this operation. If you encounter issues with this operation, contact technical support.

Request parameters

Parameter

Type

Required

Description

Example

RegionId

string

Yes

The region ID of the BGP group.

Call the DescribeRegions operation to query the most recent region list.

cn-shanghai

BgpGroupId

string

Yes

The BGP group ID.

bgpg-wz9f62v4fbg2g****

Name

string

No

The BGP group name.

The name must be 2 to 128 characters in length, and can contain digits, periods (.), underscores (_), and hyphens (-). The name must start with a letter but cannot start with http:// or https://.

test

Description

string

No

The BGP group description.

The description must be 2 to 256 characters in length. It must start with a letter and cannot start with http:// or https://.

BGP

LocalAsn

integer

No

The custom autonomous system number (ASN) for BGP on the Alibaba Cloud side. Valid values:

  • 45104

  • 64512~65534

  • 4200000000~4294967294

Note

65025 is reserved by Alibaba Cloud. Alibaba Cloud uses 45104 as the local ASN by default. Custom local ASNs may cause loops in multi-line scenarios. Proceed with caution.

45104

PeerAsn

integer

No

The ASN of the gateway device in the data center.

1****

AuthKey

string

No

The authentication key of the BGP group.

!PWZ2****

IsFakeAsn

boolean

No

Whether to use a fake AS number. Valid values:

  • false (default)

  • true

Note

A BGP router typically belongs to only one AS. If you need to replace an AS but cannot immediately modify BGP configurations due to business requirements, you can specify a fake AS number to maintain connectivity. This ensures service continuity during AS migration or merging.

false

ClientToken

string

No

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

You can use the client to generate the token, but make sure that the token is unique across requests. The client 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 may be different for each request.

123e4567-e89b-12d3-a456-426655440000

RouteQuota

integer

No

The maximum number of routes supported by a BGP peer. Default value: 110.

110

ClearAuthKey

boolean

No

Whether to clear the secret key. Valid values:

  • true

  • false (default)

false

Response elements

Element

Type

Description

Example

object

The request ID.

RequestId

string

The request ID.

8C3C6D7C-A1CE-4FD8-BC57-DC493A55F76F

Examples

Success response

JSON format

{
  "RequestId": "8C3C6D7C-A1CE-4FD8-BC57-DC493A55F76F"
}

Error codes

HTTP status code

Error code

Error message

Description

400 QuotaExceeded.Bgp bgp peer count per vbr quota exceed. The number of BGP peers in the VBR has reached the upper limit.
400 QuotaExceeded.Nqa nqa count per vbr quota exceed.
400 QuotaExceeded.BgpNetwork bgp network count per vbr quota exceed.
400 InvalidPeerIpAddress multi pconn peer ip can not be null.
400 InvalidVbrNetwork vbr netowrk not exists
400 InvalidBgpGroup bgp group not exists
400 InvalidBgpName.Malformed Specified Bgp Group name is not valid.
400 InvalidBgpDiscription.Malformed Specified Bgp Group description is not valid.
400 InvalidBgpAuthkey.Malformed Specified Bgp Group authkey is not valid.
400 InvalidIP.Malformed Ip malformed.
400 InvalidPeerAsn.Malformed invalid peer asn cannot equals aliyun asn:45104
400 InvalidParams.NotNull %s
400 InvalidBgpGroup.LocalAsnInvalid The specified BgpGroup LocalAsn is invalid, only support 64512 to 65534 or 4200000000 to 4294967294, and cannot be 65025.
400 InvalidParams.NotFound instance not found
400 InvalidParams.AlreadyExists bgp network already exists The BGP network already exists.
400 InvalidStatus.CannotOperate invalid status cannot operate
400 InvalidParams.PeerIpAddressMustPointOut vbr has 0 or more than 1 subif ,point out peerIpAddress. You must set the PeerIpAddress parameter.
400 InvalidParams.PeerIpAddressInUse peer ip address in use ,cannot create bgp peer. The peer IP address is being used. Therefore, you cannot use it to create a BGP peer.
400 IllegalParam.PeerAsn %s
400 IllegalParam.LocalAsn %s
400 OperationFailed.PconnTrafficNotEnable The operation is failed because of PconnTrafficNotEnable. Billing for outbound data transfer is disabled.
400 OperationUnsupport Operation is unsupport, not in vbr support custom local asn white list. The operation is not supported.
400 OperationFailed.ClearAuthKeyForbidden The specific auth key is not empty. The specified key is not empty and cannot be cleared.
400 IllegalParam.RouteLimit The operation is failed because of bgp group max route entry num quota exceed. The number of routes that can be received by each BGP peer in the BGP group exceeds the upper limit.
400 OperationDenied.VbrAttachEcrInMiddleStatus The operation is not allowed because of VBR attach or detach ECR in middle status. The current operation cannot be performed because the VBR is in the process of loading or unloading the leased line gateway. Please wait a moment and try again.
400 OperationUnsupported.VBRAttachedECR VBR already attached to ECR, please delete it from ECR. The VBR has been bound to ECR. Delete the VBR from ECR and try again.
400 OperationFailed.ResourceLockedBySystem The specified resource is locked by system. The operating resource is locked by the system and cannot be operated temporarily.
404 InvalidRegionId.NotFound Specified value of "regionId" is not supported.

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.