This topic describes how to migrate virtual border routers (VBRs) and virtual private clouds (VPCs) in peering connections or VBR-to-VPC connections to Cloud Enterprise Network (CEN). You can use CEN to establish private connections between VPCs, and between VPCs and data centers. CEN supports automatic route distribution and learning, which speeds up network convergence, improves the quality and security of cross-network communications, and connects all network resources.
Migration process
After you make all preparations, attach the VBR-to-VPC connections, VPC peering connections, and VBR connections to your CEN instance. Then, you can manage the routes to adjust network communication.
The CEN instance automatically learns and distributes the routes of the attached network instances. After you attach the VBR-to-VPC connections, VPC peering connections, and VBR connections to the CEN instance, the static routes of the VBR-to-VPC connections and VPC peering connections have higher priorities than CEN dynamic routes. If a VPC route table contains such static routes, the route table does not accept CEN routes that are the same as the static routes. To ensure a successful migration, we recommend that you split a route that points to a large CIDR block into multiple child routes. After the CEN instance learns the child routes, you can delete the child routes. For more information, see Migrate a VBR from a peering connection to a CEN instance and Migrate a VPC from a peering connection to a CEN instance.