This topic describes how to use Basic Edition transit routers to connect virtual private clouds (VPCs) that are deployed in the same region.
Regions that support Basic Edition transit routers
Area | Region |
---|---|
Chinese mainland | Chinese mainland CCN |
Asia Pacific | Japan CCN, Singapore CCN, Hong Kong CCN, Malaysia CCN, and Indonesia CCN |
Europe | Frankfurt CCN |
Australia | Australia CCN |
Scenario
A company has deployed two VPCs (VPC1 and VPC2) in the China (Guangzhou) region. Elastic Compute Service (ECS) instances are deployed in the VPCs. The two VPCs cannot communicate with each other. Due to business growth, the company wants to enable the two VPCs to communicate with each other.
In this case, the company can use Cloud Enterprise Network (CEN) to connect the two VPCs to the Basic Edition transit router in the China (Guangzhou) region. Then, the two VPCs can communicate with each other.

Prerequisites
- Two VPCs are deployed in the China (Guangzhou) region. ECS instances are deployed
in the VPCs. For more information, see Create a VPC with an IPv4 CIDR block.The following table shows how CIDR blocks are allocated to the VPCs. Make sure that the CIDR blocks do not overlap.
Network instance CIDR block Network instance region ECS instance IP address VPC1 - VPC CIDR block: 192.168.0.0/16
- vSwitch CIDR block: 192.168.0.0/24
China (Guangzhou) 192.168.0.239 VPC2 - VPC CIDR block: 10.0.0.0/16
- vSwitch CIDR block: 10.0.0.0/24
China (Guangzhou) 10.0.0.97 - You must be aware of the security group rules that are applied to the ECS instances in the VPCs. Make sure that the security group rules allow the VPCs to communicate with each other. For more information, see Query security group rules and Add a security group rule.
Procedure

Step 1: Create a CEN instance
Step 2: Connect the VPCs to the transit router
Connect the VPCs to the transit router in the China (Guangzhou) region. Then, the VPCs automatically learn routes from each other to establish network communication.
Step 3: Test network connectivity
After VPC1 and VPC2 are connected to the transit router, they can communicate with each other. In the following example, VPC1 is used to test the network connectivity between VPC1 and VPC2.