Links a classic network instance to the Virtual Private Cloud (VPC), which allows the classic network instance communicating with the resources that are in the intranet of a VPC.  For more information, see VPC topic ClassicLink overview


When you call this interface, consider the following:

  • The instance must be in the Running (Running) or Stopped (Stopped) status.

  • The ClassiscLink service must be enabled for the specified VPC. For more information, see VPC topic Build ClassicLink connection.

  • The classic network instance and the VPC must be in the same Alibaba Cloud region.

Request parameters

Name Type Required Description
Action String Yes The name of this interface.  Value: AttachClassicLinkVpc.
RegionId String Yes.  Region ID of the instance.  For more information, see DescribeRegions  to obtain the latest region list.
InstanceId String Yes.  ID of the classic network instance.  You can call DescribeInstances to obtain all of your instance IDs.
VpcId String Yes.  ID of the ClassicLink enabled VPC.  You can call DescribeVpcs to obtain all of your VPC IDs.

Response parameters

All are common response parameters.  For more information, seeCommon parameter.


Request example
&<Common Request Parameters>
Response example

XML format

JSON format

    "RequestId": "C0003E8B-B930-4F59-ADC0-0E209A9012A8"

Error codes

The following error codes are specific to this interface. For more error codes, visit the API error center.

Error code Error information HTTP status code Description
Abs.InvalidInstanceId.MalFormed The specified instance has already been linked to another VPC. 400 The specified instance is already linked to another VPC.
InvalidInstanceId.MalFormed The specified instance is not a classic network type instance. 400 The network type of the specified instance is not a classic network.
InvalidRegionId.Malformed The specified RegionId is invalid. 400 The specified RegionId does not exist or you are not authorized to access the specified region.
InvalidVpcId.Malformed The specified VpcId is invalid. 400 The specified VpcId is invalid.
InvalidInstanceId.NotBelong The user does not own the specified instance. 403 The specified instance does not belong to you.
InvalidStatus.InstanceLocked The specified instance is in another processing list. 403 The specified instance is processing another task.
InvalidStatus.InstanceStatus Only the Running or Stopped InstanceStatus is allowed. 403 The specified instance must be in the Running (Running) or Stopped (Stopped) status.
OperationDenied The specified VPC are unable to attach ClassicLink. 403 The specified VPC cannot enable ClassicLink.
QuotaExceeded The maximum number of links in the specified VPC exceeds. 403 The number of available links for the current VPC has reached the upper limit, up to 1000 classic network type instances are allowed to connect to the same VPC.
InvalidInstanceId.NotFound The specified InstanceId does not exist. 404 The specified InstanceId does not exist.