:Attach network instances to a CEN instance

This topic describes how to attach network instances to a Cloud Enterprise Network (CEN) instance for intercommunication. After you attach network instances to a CEN instance, the CEN instance automatically learns and distributes routes of the attached network instances to enable intercommunication.

Background information

You can use CEN to connect network instances created under the same account or other accounts. For example, you create a CEN instance CEN-abc123 under an account with the UID 87654321. You can attach the following network instances to the CEN instance: VPC-b123 under the same account and VPC-a321 under another account. Then, VPC-b123 and VPC-a321 can communicate with each other.

1. Log on to the CEN console.
2. On the Instances page, click the ID of the CEN instance.
3. On the details page, you can use one of the following methods to navigate to the Connection with Peer Network Instance page and create a connection:
   • Locate the section that displays the type of network instance that you want to attach and click the icon. CEN supports the following types of network instances: virtual private clouds (VPCs), virtual border routers (VBRs), and cloud connect networks (CCNs).
     Note If no transit router is created for the CEN instance, use this method to create the first connection with the network instance.
   • In the Transit Router section, click the ID of a transit router. On the page that appears, click Create Connection on the Intra-region Connections tab.
4. On the Connection with Peer Network Instance page, set the following parameters.

   Parameter	Description
   Network Type	The system automatically selects the network type that you have specified. VPC is selected by default. CEN supports the following three types of network instances: VPC VBR CCN
   Region	Select the region where the network instance is deployed.
   Transit Router	The transit router created in the selected region is displayed. If no transit router is found in the selected region, the system automatically creates a transit router.
   Resource Owner ID	Select the account to which the network instance belongs. You can attach network instances under the same account or under other accounts. If the network instance and the CEN instance belong to the same account, select Your Account. If the network instance and the CEN instance belong to different accounts, select Different Account and enter the UID of the network instance owner. Note To attach network instances under other accounts, you must first contact the owners, and acquire the permissions to attach their network instances to your CEN instance. For more information, see Acquire permissions to attach network instances under other accounts.
   Network Instance	Select the ID of the network instance.

5. Click OK.