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Cloud Enterprise Network:Bandwidth multiplexing

Last Updated:Dec 15, 2023

Cloud Enterprise Network (CEN) supports the bandwidth multiplexing feature, which allows transit routers deployed in a Cloud Connect Network (CCN) area to share the bandwidth of an inter-region connection with regional transit routers in the same area. This simplifies bandwidth management and increases bandwidth utilization.

Features

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Show term descriptions

Regional transit router

Regional transit routers are not deployed in CCN areas.

For example, the transit router deployed in the China (Hangzhou) or Singapore region is a regional transit router.

CCN transit router

CCN transit routers are deployed in CCN areas.

For example, the transit router deployed in the Chinese mainland or Singapore area of CCN is a CCN transit router.

    Intra-area and inter-area

    These terms indicate whether a transit router is deployed in the same area as the CCN transit router connected to the CEN instance. Intra-area indicates that they are deployed in the same area. Inter-area indicates that they are deployed in different areas.

    CCN is deployed by area. Each area of CCN contains one or more regions. For more information about areas and regions, see CCN areas and CEN regions.

    For example, a transit router is deployed in the Chinese mainland area, which includes the China (Hangzhou) and China (Shenzhen) regions. In this case, the transit router in the China (Hangzhou) region and the transit router in the Chinese mainland area are intra-area. However, the transit router in the Chinese mainland area and the transit router in the Singapore area are inter-area.

    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.

    Note
    • Within the same CCN area, CCN transit routers can communicate with regional transit routers in regions within the CCN area by default. You do not need to allocate bandwidth for inter-region communication. If the CCN transit routers and regional transit routers are in different CCN areas, you must allocate bandwidth for inter-region communication.

      For example, the transit router in the Chinese mainland area of CCN can communicate with the transit router in the China (Hangzhou) region by default. You do not need to allocate bandwidth for inter-region communication. However, the transit router in the Chinese mainland area of CCN cannot communicate with the transit router in the UK (London) region by default. To enable communication, you must allocate bandwidth for inter-region communication.

    • The bandwidth between a CCN transit router and the regional transit router in the same CCN area is determined by the bandwidth of the Smart Access Gateway (SAG) instance that is connected to the CCN instance.

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    Scenarios

    This section describes the common use scenarios of bandwidth multiplexing.

    Bandwidth multiplexing for a single CCN transit router

    For more information, see the Features section in this topic.

    Bandwidth multiplexing for multiple CCN transit routers

    The following figure shows how bandwidth multiplexing works during communication between the Chinese mainland and Singapore areas of CCN.带宽复用-四地域.png

    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

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    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.设置带宽复用

      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.带宽复用-2.png

      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.

      带宽复用-执行结果.png

    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.取消带宽复用示例