Both cross-region and cross-account communication of VPCs are advanced features of peering connections. This document describes how to implement cross-region communication by using an example.
Example
IP range 1: subnet A 192.168.1.0/24 of VPC1 in Guangzhou.
IP range 2: subnet B 10.0.1.0/24 of VPC2 in Beijing.
Perform the two steps below to implement communication between IP ranges 1 and 2 over a peering connection under the same account:
2. Select a region and a VPC (for example, Guangzhou and VPC1) above the list and then click New to create a peering connection.
3. Enter a name (for example, PeerConn), select the local region and network, and select the peer region (for example, Beijing), account type, and VPC. Then, accept the service agreement.
If the peer account type is My Account, select the account from the drop-down list.
If the peer account type is Other Accounts, enter the account ID and VPC ID of the peer account.
4. Select the bandwidth cap.
For an intra-region peering connection, there is no bandwidth cap. Therefore, this cannot be modified.
For a cross-region peering connection, the bandwidth cap can be selected. The bandwidth cap supports 10Mbps, 20Mbps, 50Mbps, 100Mbps, 200Mbps, 500Mbps, and 1Gbps. If you need higher cross-region bandwidth, please submit a ticket.
5. Click Create. A peering connection between two VPCs under the same account takes effect immediately after its creation.
Step 2: set route tables at both ends
Note
You must configure routes on both sides to implement communication over a peering connection.
Please directly add routing policies to the original route table associated with the subnet at both ends. There is no need to create a new route table, because if you use a new route table to add routing policies, the original route table of the subnet will be replaced, and the original routing policies will become invalid. All instances under the subnet use the new routing table policy, which may affect services.
To enable communication between multiple IP ranges of the two VPCs, you simply need to add route table entries, instead of creating multiple peering connections.
1. Log in to Tencent Cloud Console and choose Products > Networking > Virtual Private Cloud to access the Virtual Private Cloud (VPC) console.
2. In the left sidebar, click Subnet to go to the management page.
3. Click the ID of the route table (route table A) associated with the local subnet (subnet A) of the peering connection to access the route table details page.
4. Click + New routing policies.
5. Enter the peer CIDR (10.0.1.0/24) for the destination, select Peering Connections for the next hop type, and select the created peering connection (PeerConn) for the next hop.
6. Click OK. After the route table is configured, communication is enabled between the IP ranges of the two VPCs.
The peer route table is configured in the same way as that at the local end.
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