Process Description

To enable network communications among VPCs that belong to the same account but are in different regions, create a cloud connection and load the VPCs to the cloud connection. Because the VPCs are in different regions, you need to buy bandwidth packages and assign inter-region bandwidths. If a VPC is outside the Chinese mainland, you need to apply for a cross-border permit before you purchase bandwidth packages.

Figure 1 shows an example.

Figure 1 Network communications among VPCs under same account but in different regions

Figure 2 illustrates how you can enable network communications among VPCs that are under the same account but in different regions.

Figure 2 Process for enabling network communications among VPCs

Procedure

1. Apply for a cross-border permit.

   Skip this step if you do not require cross-border communications in your network plan.

   If a VPC to be connected is outside the Chinese mainland, you need to apply for a cross-border permit.

   Prepare required materials.

   1. Log in to the management console.
   2. Hover on the upper left corner to display Service List and choose Networking > Cloud Connect.
   3. In the navigation pane on the left, choose Cloud Connect > Cross-Border Permit.
   4. Click Download Materials.
   5. Print and sign the Cloud Connect Cross-Border Circuit Service Agreement, Letter of Authorization for Representative, and China Unicom Letter of Commitment to Information Security of the Cross-Border Circuit Service, and stamp your company's official seal.
   6. Prepare a scanned copy of your company's business license, of the representative's ID card, of the Cloud Connect Cross-Border Circuit Service Agreement, of the Letter of Authorization for Representative, and of the China Unicom Letter of Commitment to Information Security of the Cross-Border Circuit Service. Ensure that all materials are stamped with your company's official seal.

   Submit an application.

   1. Log in to the management console.
   2. Hover on the upper left corner to display Service List and choose Networking > Cloud Connect.
   3. In the navigation pane on the left, choose Cloud Connect > Cross-Border Permit.
   4. Click Submit Application.
   5. Fill in the enterprise and representative information, and upload the prepared materials.
   6. Click Submit.

      After you submit the application, the status will change to Pending approval. The review takes about one working day. When the status changes to Approved, you can buy bandwidth packages.

2. Create a cloud connection.
   1. Log in to the management console.
   2. Hover on the upper left corner to display Service List and choose Networking > Cloud Connect.
   3. On the Cloud Connections page, click Create Cloud Connection.
   4. Configure the parameters based on Table 1.

      Table 1 Parameter description

      Parameter	Description	Example Value
      Name	Specifies the cloud connection name. The name can contain 1 to 64 characters, including letters, digits, underscores (_), hyphens (-), and periods (.).	CC_01
      Enterprise Project	Provides a cloud resource management mode, in which cloud resources and members are centrally managed by project.	default
      Description	Provides supplementary information about the cloud connection. The description can contain a maximum of 255 characters.	N/A

   5. Click OK.

      

3. Load network instances.

   Load the VPCs that need to communicate with each other to the cloud connection based on your network plan.

   1. In the cloud connection list, locate the cloud connection and click its name.
   2. Click Network Instances.
   3. Click Load Network Instance.
   4. Select the VPC you want to load.

      Configure other parameters based on Table 2 and then click OK.

      Figure 3 Loading a VPC
      

      Table 2 Parameter description

      Parameter	Description	Example Value
      Account	Specifies whether network instances are from the current account or another account.	Current account
      Region	Specifies the region where the VPC you want to connect is located.	N/A
      Instance Type	Specifies the type of the network instance. Two options are available, VPC and Virtual gateway. Currently, you can load only VPCs across accounts.	VPC
      VPC	Specifies the VPC you want to load to the cloud connection. This parameter is mandatory if you have set Instance Type to VPC.	VPC-w2
      VPC CIDR Block	Specifies the subnets of the VPC you want to load and the custom CIDR blocks. If you have set Instance Type to VPC, configure the following two parameters: Subnet: Select one or all subnets of the VPC. Other CIDR Block: Add one or more custom CIDR blocks as needed.	Subnet: subnet-test Other CIDR Block: 192.168.3.0/16
      Remarks	Provides supplementary information about the network instances.	N/A

   5. In the dialog box indicating that the VPC has been created, if you want to load another VPC, click Load Another Instance. Then click the Network Instances tab to view the VPCs you loaded.

4. Buy a bandwidth package and bind it to the cloud connection.

   By default, the system allocates 10 kbit/s of bandwidth for testing network connectivity across regions. To enable network communications across regions no regardless of if they are in the same geographic region or in different geographic regions, you need to purchase a bandwidth package, bind it to the cloud connection, and assign inter-region bandwidths.

   

   A cloud connection can only have one bandwidth package regardless of if the cloud connection is used for communications within a geographic region or between geographic regions. For example, if network instances are in the Chinese mainland and Asia Pacific, your cloud connection can only have one bandwidth package.

   Buy a bandwidth package.

   1. In the navigation pane on the left, choose Cloud Connect > Bandwidth Packages.
   2. Click Buy Bandwidth Package.
   3. Configure the parameters based on Table 3 and click Buy Now.

      Table 3 Parameter description

      Parameter	Description	Example Value
      Billing Mode	Specifies how you want the bandwidth package to be billed. Currently, only Yearly/Monthly is available.	Yearly/Monthly
      Name	Specifies the bandwidth package name. The name can contain 1 to 64 characters, including letters, digits, underscores (_), hyphens (-), and periods (.).	daikuaibao1
      Billed By	Specifies by what you want the bandwidth package to be billed.	Bandwidth
      Applicability	Specifies whether you want to use the bandwidth package for network communication within a geographic region or between geographic regions. Two options are available: Single Geographic Region: The regions you assign inter-region bandwidths to are in the same geographic region. Across Geographic Regions: The regions you assign inter-region bandwidths to are in different geographic regions.	Single Geographic Region
      Geographic Region	Specifies the geographic region where regions requiring inter-region bandwidths are located.	Chinese mainland
      Bandwidth	Specifies the bandwidth you require for network communications across regions, in Mbit/s. The sum of all inter-region bandwidths you assign cannot exceed the bandwidth of the bandwidth package. Assign the bandwidth based on your network plan.	50 Mbit/s
      Required Duration	Specifies how long you require the bandwidth package for. Auto renewal is supported.	1 month
      Enterprise Project	Provides a cloud resource management mode, in which cloud resources and members are centrally managed by project.	default
      Cloud Connection	Specifies the cloud connection you want to bind the bandwidth package to. Two options are available, Bind now and Bind later.	Bind now

      Figure 4 Buying a bandwidth package
      
   4. Confirm the information and click Pay Now.
   5. Click Pay.

      Go back to the bandwidth package list and locate the bandwidth package. If its status changes to Normal, you can bind the bandwidth package to the cloud connection.

   Bind the bandwidth package to the cloud connection.

   Bind the purchased bandwidth package to the created cloud connection to enable communication between network instances.

   1. In the cloud connection list, click the name of the created cloud connection.
   2. Click Bound Bandwidth Packages.
   3. Select the purchased bandwidth package and bind it to the cloud connection.

5. Assign inter-region bandwidth.
   1. In the cloud connection list, click the name of the created cloud connection.
   2. Click Inter-Region Bandwidths.
   3. Click Assign Inter-Region Bandwidth and configure the parameters based on Table 4.

      Table 4 Parameter description

      Parameter	Description	Example Value
      Regions	Specifies the two regions between which network communications are required.	CN East-Shanghai1, CN North-Beijing4
      Bandwidth package	Specifies the bandwidth package you want to bind to the cloud connection.	N/A
      Bandwidth	Specifies the bandwidth you require for communications between regions, in Mbit/s. The sum of all inter-region bandwidths you assign based on the bandwidth package cannot exceed the bandwidth of the bandwidth package. Plan the bandwidth in advance.	N/A

   4. Click OK.

      Now the VPCs in the two regions can communicate with each other.

      

      The default security group rule denies all the inbound traffic. Ensure that security group rules in both directions are correctly configured for resources in the regions to ensure normal communications.