To associate VPC and CCN under different accounts, the VPC account should initiate an association request. The association is established when the CCN account accepts the request.
The following figure illustrates the detailed steps:

Submitting Association Request via a VPC Account

1. Log in to VPC Console .
2. Click the ID of the VPC to be added to a CCN to open the details page. Then, click Associate Now.
   
3. In the window that appears, enter the peer account ID and the peer CCN ID, and then click OK to submit the application.
   

Accepting the Application via the CCN Account

1. Log in to CCN Console and click the ID of the CCN instance with a pending association request.
2. On the Bind with Instance tab page, find the information about the VPC to be approved, and click Accept to add the VPC to the CCN.
   

(Optional) Checking the Route Table

After the association request is accepted and the association succeeds, you need to view the route table to check whether the IP range of this instance conflicts with that of an existing CCN instance, to prevent a routing failure.
For more information about related operations, see Checking Route Table.

(Optional) Setting a Bandwidth for Cross-Region Interconnection

For more information about related operations, see Setting a Bandwidth for Cross-Region Interconnection.