Cloud Connect Network (CCN) provides the bandwidth multiplexing feature. CCN transit routers and other transit routers that belong to the same region can share bandwidth resources to communicate with instances that are deployed in other regions. This facilitates configurations and allows you to use bandwidth resources in a more flexible way.

Limits

  • Only cross-region connections support bandwidth multiplexing.
  • Only CCN transit routers support bandwidth multiplexing. Region-specific transit routers do not support bandwidth multiplexing.

Scenarios

Bandwidth multiplexing is applicable to the following scenarios:

  • A CCN instance is connected to virtual private clouds (VPCs) that are deployed in different regions. One region is specified as the transit region. This scenario includes three regions in total.
    Figure 1. Scenario 1
    Scenario 1
  • A CCN instance is connected to another CCN instance that is deployed in a different region. At most two regions can be specified as the transit regions. This scenario includes four regions in total.
    Figure 2. Scenario 2
    Scenario 2

In this topic, Figure 1 is used as an example to describe how to configure bandwidth multiplexing.

VPCs are deployed in the region where the CCN instance is deployed, and the CCN instance is connected to VPCs that are deployed in other regions. In this case, you must use Cloud Enterprise Network (CEN) to configure bandwidth for Connection 1 in Figure 1 and Connection 2 in Figure 1. The sum of the bandwidth values that are configured for Connection 1 and Connection 2 is the bandwidth value of the cross-region bandwidth plan configured for the China (Shenzhen) and Singapore (Singapore) regions. The unit price of a cross-region bandwidth plan is high. In addition, data transfer in Connection 1 and Connection 2 fluctuates, and cannot be estimated. In this case, bandwidth resources cannot be properly utilized, and network congestion may occur.

If you use the bandwidth multiplexing feature, you do not need to configure bandwidth for Connection 2. Instead, you can apply all cross-region bandwidth plans to Connection 1. In this case, data transferred in Connection 2 is transmitted through transit routers in the China (Shenzhen) region. Data transfer of Connection 3 is within the China (Shenzhen) region. Therefore, the bandwidth value of Connection 3 is the same as that of the Smart Access Gateway (SAG) instance.

Before you use bandwidth multiplexing

Prerequisites

Before you configure bandwidth multiplexing, you must prepare required environment resources, as described in the following table.

Environment resource Description Reference
VPC You must deploy VPCs in the China (Shenzhen) and Singapore (Singapore) regions. Work with VPCs
CCN You must create a CCN instance in mainland China. Create a CCN instance
CEN You must create a CEN instance. Create a CEN instance
Transit routers You must create transit routers in the China (Shenzhen) region, the Singapore (Singapore) region, and the region where the CCN instance is deployed.

Make sure that the route table of the transit router in the transit region, which is the China (Shenzhen) region in this example, contains routes that point to the instances to be connected. Otherwise, data transfer will be interrupted. For more information, see View routes of a transit router.

Create a transit router
Network instance connections You must connect VPCs to the CCN instance by using the CEN instance. Create a VPC connection
Bandwidth plans You must purchase a bandwidth plan and associate it with the CEN instance.
Note After you purchase a bandwidth plan, the system automatically associates it with the CEN instance. If you already have a bandwidth plan that is disassociated, you can associate it with the CEN instance. For more information, see Associate a bandwidth plan with a CEN instance. You must associate a bandwidth plan with the CEN instance before you can establish cross-region connections.
Purchase a bandwidth plan
Cross-region connections You must configure cross-region connections between the China (Shenzhen) and Singapore (Singapore) regions, and between the Singapore (Singapore) region and the region where the CCN instance is deployed.
Notice You must first configure the bandwidth for the connection between the China (Shenzhen) and Singapore (Singapore) regions. Then, configure the bandwidth for the connection between the Singapore (Singapore) region and the region where the CCN instance is deployed.
Create a cross-region connection

Procedure

  1. Log on to the CEN console.
  2. On the Instances page, click the ID of the CEN instance that you want to manage.
  3. On the details page of the CEN instance, click the ID of the transit router for which you want to configure cross-region connections.
  4. On the details page of the transit router, click Cross-region Connections.
  5. Find the connection between the Singapore (Singapore) region and the region where the CCN instance is deployed. Then, click Configure Bandwidth Multiplexing in the Actions column.
  6. On the Configure Bandwidth Multiplexing page, select the source connection and click OK.
    Note In this case, the bandwidth between the region where the CCN instance is deployed and the Singapore (Singapore) region is downgraded to 0 Mbit/s. Data of all CCN cross-region connections is transferred through transit routers that are deployed in the same region.
  7. Optional:We recommend that you set the bandwidth value of the connection whose bandwidth is shared to the upper limit.
    Note In this example, the bandwidth of the connection between the China (Shenzhen) region and the Singapore (Singapore) region is shared.
    1. In the Bandwidth column of the connection whose bandwidth is shared, click Modify.
    2. Set the bandwidth value to the upper limit and click OK.

Verify the results

On the details page of the transit router, find the connection between the region where the CCN instance is deployed and the Singapore (Singapore) region. Then, click View Detour Path in the Connected Regions column to view the detour path and bandwidth value.

Related operations

You can disable bandwidth multiplexing. After you disable bandwidth multiplexing, it is no longer supported by cross-region connections.

  1. On the details page of the transit router, find the connection between the region where the CCN instance is deployed and the Singapore (Singapore) region. Then, click Disable Bandwidth Multiplexing in the Connected Regions column.
  2. Select the bandwidth that is used after bandwidth multiplexing is disabled, and click OK.
    • Downgrade to 10 Kbit/s: After bandwidth multiplexing is disabled, bandwidth for all cross-region connections is downgraded to 10 Kbit/s.
    • Set to Minimum Bandwidth of Current Connection: After you disable bandwidth multiplexing, the bandwidth of a cross-region connection is set to the lower limit of the connection before bandwidth multiplexing is disabled.

    For example, the following figure shows the bandwidth values of different cross-region connections. Bandwidth multiplexing is enabled for Connection A. After you disable bandwidth multiplexing, the bandwidth values of cross-region connections have the following changes:

    • If you select Downgrade to 10 Kbit/s, the bandwidth values of Connection A-C, Connection A-D, Connection B-C, and Connection B-D are all set to 10 Kbit/s.
    • If you select Set to Minimum Bandwidth of Current Connection, the bandwidth values of Connection A-C, Connection A-D, Connection B-C, and Connection B-D are set to 2 Mbit/s, 2 Mbit/s, 5 Mbit/s, and 3 Mbit/s.
    Example