Cloud Enterprise Network:Bandwidth multiplexing

Features

Inter-region communication requires inter-region connections. In the preceding figure, the CCN transit router TR1 and the regional transit router TR2 are in the same region. If you need them to communicate with the transit router TR3, which is in a different region, you need to establish inter-region connections between TR1 and TR3, and between TR2 and TR3. The volume of network traffic over the inter-region connections is difficult to predict due to large traffic fluctuations. The bandwidth of the inter-region connections cannot be flexibly adjusted. As a result, traffic congestion may occur.

To address this issue, CEN supports bandwidth multiplexing. This feature can multiplex the bandwidth of Inter-region Connection 1 between TR2 and TR3 to transmit data between TR1 and TR3. You do not need to allocate bandwidth for Inter-region Connection 2.

Scenarios

This section describes the common use scenarios of bandwidth multiplexing.

Limits

• The bandwidth multiplexing feature is unavailable by default. To use this feature, submit a ticket.

• Bandwidth multiplexing is supported only by inter-region connections that are connected to CCN transit routers.

  • If the regional transit router in the same area as the CCN transit router is of Enterprise Edition, you need to create an inter-region connection between the regional transit router and CCN transit router to enable communication between them. You do not need to allocate bandwidth for inter-region communication.

  • If the regional transit router in the same area as the CCN transit router is of Basic Edition, you do not need to create an inter-region connection between the transit routers because they can communicate with each other by default.

Configuration examples

This section describes how to configure bandwidth multiplexing. The preceding figure shows an example. An enterprise deployed a virtual private cloud (VPC) in the China (Hangzhou) region and another VPC in the UK (London) region. The enterprise also deployed a data center in the Chinese mainland. Network communication among the three regions is established.

To ensure data transmission, the enterprise needs to frequently adjust the bandwidth of Inter-region Connection 1 and Inter-region Connection 2 due to large traffic fluctuations between VPC1 and VPC2, and between VPC2 and the data center. The bandwidth of Inter-region Connection 1 and Inter-region Connection 2 is difficult to predict. Manual bandwidth adjustment is time-consuming. To ensure data transmission, the enterprise wants to use the bandwidth multiplexing feature to transfer network traffic between VPC2 and the data center over Inter-region Connection 1, and increase the bandwidth of Inter-region Connection 1. This solution simplifies bandwidth adjustment and reduces O&M costs.

Prerequisites

An inter-region connection is established between the transit routers. For more information, see Manage inter-region connections.

The following configurations are applicable to this example:

• Create an inter-region connection between the transit routers in the China (Hangzhou) and UK (London) regions, and between the CCN transit router in the Chinese mainland area and the transit router in the UK (London) region. In this example, Inter-region Connection 1 and Inter-region Connection 2 are created.

• If the transit router in the China (Hangzhou) region is of Enterprise Edition, create an inter-region connection between the CCN transit router in the Chinese mainland area and the transit router in the China (Hangzhou) region. Otherwise, network traffic from the CCN transit router in the Chinese mainland area cannot be transferred over Inter-region Connection 1.

  If the transit router in the China (Hangzhou) region is of Basic Edition, you do not need to create an inter-region connection between the CCN transit router in the Chinese mainland area and the transit router in the China (Hangzhou) region.

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 Basic Settings > Transit Router tab, click the ID of the transit router for which you want to enable bandwidth multiplexing.

4. On the details page of the transit router, click the Cross-region Connections tab.

5. Find the inter-region connection that you want to manage and click Configure Bandwidth Multiplexing in the Actions column.

6. In the Configure Bandwidth Multiplexing dialog box, select a connection in the Source Connection drop-down list, and click OK.

   Results

   After the configurations are applied, the bandwidth between the CCN transit router in the Chinese mainland area and the transit router in the UK (London) region is decreased to 0 Mbit/s. Network traffic from the CCN transit router is transmitted to the China (Hangzhou) region.

   On the Cross-region Connections tab, find the inter-region connection and click View Detour Path in the Connection Region column to view the detour path for the CCN transit router and the bandwidth of the inter-region connection.

   

What to do next

Modify the bandwidth of an inter-region connection

We recommend that you adjust the bandwidth of inter-region connections whose bandwidth is multiplexed. For more information, see Modify the maximum bandwidth value of inter-region connections.

In the configuration example in this topic, network traffic between the CCN transit router in the Chinese mainland area and the transit router in the UK (London) region is transferred over Inter-region Connection 1. Therefore, the bandwidth of Inter-region Connection 1 needs to be adjusted to ensure data transmission.

Disable bandwidth multiplexing

Procedure

1. On the Cross-region Connections tab of the CCN transit router, click Disable Bandwidth Multiplexing in the Actions column.

2. In the Disable Bandwidth Multiplexing dialog box, select a bandwidth option and click OK.

   • Downgrade to 10 Kbit/s: After bandwidth multiplexing is disabled, the bandwidth of the inter-region connection is set to 10 Kbit/s.

   • Set to Minimum Bandwidth of Current Connection: After bandwidth multiplexing is disabled, the bandwidth of the inter-region connection is set to the minimum bandwidth value during bandwidth multiplexing.

Examples

The following figure shows the bandwidth value of each inter-region connection. Bandwidth multiplexing is enabled for Connection A. After you disable bandwidth multiplexing, the bandwidth values of the inter-region connections are set to the following values:

• If you select Downgrade to 10 Kbit/s, the bandwidth between Transit Router A and Transit Router C, between Transit Router A and Transit Router D, between Transit Router B and Transit Router C, and between Transit Router B and Transit Router D is set to 10 Kbit/s.

• If you select Set to Minimum Bandwidth of Current Connection, the bandwidth between Transit Router A and Transit Router C is 2 Mbit/s, between Transit Router A and Transit Router D is 2 Mbit/s, between Transit Router B and Transit Router C is 5 Mbit/s, and between Transit Router B and Transit Router D is 3 Mbit/s.