Using a Central Network and Enterprise Routers to Connect VPCs in Different Regions

In this section, a central network and enterprise routers are used to connect the VPCs in the same account but different regions.

Relying on the Huawei backbone network, you can build a central network to manage global network resources on premises and on the cloud easily and securely. After attaching the VPCs to enterprise routers in each region, you can add the enterprise routers to a central network, so that all the VPCs attached to the enterprise routers can communicate with each other across regions.

• For details about the regions where central networks are available, see Region Availability.
• The CIDR blocks of the VPCs must be unique. If there are overlapping CIDR blocks, the communication may fail.

Architecture

For nearby access, an enterprise runs workloads in regions A, B, and C. The VPCs in each region need to communicate with each other. To achieve this, you can:

1. Create an enterprise router in each region: ER-A in region A, ER-B in region B, and ER-C in region C.
2. Create a central network and add ER-A, ER-B, and ER-C to the central network as attachments so that the three enterprise routers can communicate with each other.
3. In region A, attach VPC-A01 and VPC-A02 to ER-A so that the two VPCs can communicate with each other. Perform the same operations in regions B and C. In this way, the VPCs in the three regions can communicate with each other over the central network.

Figure 1 Cross-region VPC network

You can share an enterprise router with different accounts to attach VPCs of these accounts to the same enterprise router for communications.