Help Center> Enterprise Router> Best Practices> Connecting VPCs Across Regions Using Enterprise Router and Central Network> Overview
Updated on 2024-06-27 GMT+08:00
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Overview

Scenario

Relying on the Huawei Cloud backbone network, Cloud Connect allows you to build a central network to easily and securely create and manage global network resources on premises and on the cloud. You can connect enterprise routers in two or more regions to a central network, so that VPCs attached to these enterprise routers can communicate with each other across regions.

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.

Constraints

The CIDR blocks of the VPCs must be unique. If CIDR blocks overlap, the VPCs may fail to communicate with each other.