Creating a VPC Peering Connection with a VPC in Another Account

Scenarios

If two VPCs from the same region cannot communicate with each other, you can use a VPC peering connection. This section describes how to create a VPC peering connection between two VPCs in different accounts.

This following describes how to create a VPC peering connection between VPC-A in account A and VPC-B in account B to enable communications between ECS-A01 and RDS-B01.

Procedure:

Step 1: Create a VPC Peering Connection

Step 2: Peer Account Accepts the VPC Peering Connection Request

Step 3: Add Routes for the VPC Peering Connection

Step 4: Verify Network Connectivity

Figure 1 Networking diagram of a VPC peering connection between VPCs in different accounts

Notes and Constraints

• Only one VPC peering connection can be created between two VPCs at the same time.
• A VPC peering connection can only connect VPCs in the same region.

• If the local and peer VPCs have overlapping CIDR blocks, the VPC peering connection may not take effect.

• For a VPC peering connection between VPCs in different accounts:
  • If account A initiates a request to create a VPC peering connection with a VPC in account B, the VPC peering connection takes effect only after account B accepts the request.
  • To ensure network security, do not accept VPC peering connections from unknown accounts.

Prerequisites

You have two VPCs in the same region, but they are from different accounts. If you want to create one, see Creating a VPC.

Step 1: Create a VPC Peering Connection

1. Log in to the management console.

2. Click in the upper left corner and select the desired region and project.
3. Click in the upper left corner and choose Network > Virtual Private Cloud.

   The Virtual Private Cloud page is displayed.

4. In the navigation pane on the left, choose Virtual Private Cloud > VPC Peering Connections.

   The VPC peering connection list is displayed.

5. In the upper right corner of the page, click Create VPC Peering Connection.

   The Create VPC Peering Connection dialog box is displayed.

6. Configure the parameters as prompted.

   For details, see Table 1.

   Figure 2 Create VPC Peering Connection
   

   Table 1 Parameters for creating a VPC peering connection

   Parameter	Description	Example Value
   VPC Peering Connection Name	Mandatory Enter a name for the VPC peering connection. The name can contain a maximum of 64 characters, including letters, digits, hyphens (-), and underscores (_).	peering-AB
   Local VPC	Mandatory VPC at one end of the VPC peering connection. You can select one from the drop-down list.	VPC-A
   Local VPC CIDR Block	CIDR block of the selected local VPC	172.16.0.0/16
   Account	Mandatory Options: My account and Another account Select Another account.	Another account
   Peer Project ID	This parameter is mandatory because Account is set to Another account. The project ID of the region that the peer VPC resides. For details about how to obtain the project ID, see Obtaining the Peer Project ID of a VPC Peering Connection.	Project ID of VPC-B in region A: 067cf8aecf3XXX08322f13b
   Peer VPC ID	This parameter is mandatory because Account is set to Another account. ID of the VPC at the other end of the VPC peering connection. For details about how to obtain the ID, see Obtaining a VPC ID.	VPC-B ID: 17cd7278-XXX-530c952dcf35

7. Click OK.
   • If the message "Invalid VPC ID and project ID." is displayed, check whether the project ID and VPC ID are correct.
     • Peer Project ID: The value must be the project ID of the region where the peer VPC resides.
     • The local and peer VPCs must be in the same region.
   • If the status of the created VPC peering connection is Awaiting acceptance, go to Step 2: Peer Account Accepts the VPC Peering Connection Request.

Step 2: Peer Account Accepts the VPC Peering Connection Request

After you create a VPC peering connection with a VPC in another account, you need to contact the peer account to accept the VPC peering connection request. In this example, account A notifies account B to accept the request. Account B needs to:

1. Log in to the management console.
2. Click in the upper left corner and choose Network > Virtual Private Cloud.

   The Virtual Private Cloud page is displayed.

3. In the navigation pane on the left, choose Virtual Private Cloud > VPC Peering Connections.

   The VPC peering connection list is displayed.

4. In the upper part of the VPC peering connection list, locate the VPC peering connection request to be accepted.
5. Locate the row that contains the target VPC peering connection and click Accept Request in the Operation column.

   After the status of the VPC peering connection changes to Accepted, the VPC peering connection is created.

6. Go to Step 3: Add Routes for the VPC Peering Connection.

Step 3: Add Routes for the VPC Peering Connection

To enable communications between VPCs connected by a VPC peering connection, you need to add forward and return routes to the route tables of the VPCs. For details, see VPC Peering Connection Usage Examples.

Both accounts need to add a route to the route table of their VPC. In this example, account A adds a route to the route table of VPC-A, and account B adds a route to the route table of VPC-B.

1. Add routes to the route table of the local VPC:
   1. In the VPC peering connection list of the local account, click the name of the target VPC peering connection.

      The Basic Information tab of the VPC peering connection is displayed.

   2. On the Local Routes tab of the VPC peering connection, click the Route Tables hyperlink.

      The Summary tab of the default route table for the local VPC is displayed.

      Figure 3 Hyperlink to route table-Local VPC
      
   3. Click Add Route.

      Table 2 describes the route parameters.

      Table 2 Parameter description

      Parameter	Description	Example Value
      Destination	The peer VPC CIDR block, subnet CIDR block, or ECS IP address. For details, see VPC Peering Connection Usage Examples.	VPC-B CIDR block: 172.17.0.0/16
      Next Hop Type	The next hop type. Select VPC peering connection.	VPC peering connection
      Next Hop	The next hop address. Select the name of the current VPC peering connection.	peering-AB
      Description	Supplementary information about the route. This parameter is optional. The route description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).	-

   4. Click OK.

      You can view the route in the route list.

      Figure 4 Route for the local VPC
      
2. Add routes to the route table of the peer VPC:
   1. In the VPC peering connection list of the peer account, click the name of the target VPC peering connection.

      The Basic Information tab of the VPC peering connection is displayed.

   2. On the Local Routes tab of the VPC peering connection, click the Route Tables hyperlink.

      The Summary tab of the default route table for the peer VPC is displayed.

      Figure 5 Hyperlink to route table-Peer VPC
      
   3. Click Add Route.

      Table 3 describes the route parameters.

      Table 3 Parameter description

      Parameter	Description	Example Value
      Destination	The local VPC CIDR block, subnet CIDR block, or ECS IP address. For details, see VPC Peering Connection Usage Examples.	VPC-A CIDR block: 172.16.0.0/16
      Next Hop Type	The next hop type. Select VPC peering connection.	VPC peering connection
      Next Hop	The next hop address. Select the name of the current VPC peering connection.	peering-AB
      Description	Supplementary information about the route. This parameter is optional. The route description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).	-

   4. Click OK.

      You can view the route in the route list.

      Figure 6 Route for the peer VPC
      

Step 4: Verify Network Connectivity