This topic describes how to connect a virtual border router (VBR) to a transit router of Cloud Enterprise Network (CEN) in the same region. After you connect a VBR to a transit router, the transit router automatically learns and distributes the routes of the VBR. This way, the VBR can communicate with other network instances that are connected to the same CEN instance through private connections.

Prerequisites

  • To connect a network instance that is created by a different account, you must first acquire the permissions from the account to which the network instance belongs. For more information, see Acquire permissions to attach network instances under other accounts.
  • The network instance that you want to connect must not be connected to other CEN instances.

Background information

Before you create a VBR connection, take note of the following items:
  • Transit routers are provided with two editions based on regions: Basic Edition and Enterprise Edition. For more information about how to view the edition of a transit router, see View the edition of a transit router.
  • Basic Edition transit routers and Enterprise Edition transit routers have different features. Enterprise Edition is developed from Basic Edition and supports all features of Basic Edition. Enterprise Edition transit routers allow you to manage routes and network instance connections in a more flexible manner. For more information, see Transit routers.

Connect a VBR to an Enterprise Edition transit router

  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 CEN page, you can use one of the following methods to navigate to the Connection with Peer Network Instance page and create a connection:
    • Find the section that displays the types of network instances and click the Add a network instance icon next to the type of network instance that you want to manage. In this example, the Add a network instance icon next to VBR is selected.
      Note If no transit router is created for the CEN instance, you can use this method to create the first connection to the network instance.
    • On the Transit Router tab, find a transit router and click Create Connection in the Actions column.
  4. On the Connection with Peer Network Instance page, set the following parameters to connect a VBR to a transit router.
    Parameter Description
    Network Type Select Virtual Border Router (VBR).
    Region Select the region where the network instance is created.
    Transit Router Displays transit routers that are created in the selected region.

    If no transit router is found in the selected region, the system automatically creates a transit router.

    Resource Owner ID Select the type of account to which the network instance that you want to connect belongs.

    CEN allows you to connect network instances that belong to the same account or different accounts.

    • If the network instance and the CEN instance belong to the same account, select Your Account.
    • If the VBR and the CEN instance belong to different accounts, select Different Account and enter the UID of the VBR owner.
    Connection Name Enter a name for the connection.

    The name must be 2 to 128 characters in length and can contain digits, underscores (_), and hyphens (-). It must start with a letter.

    Network Instance Select the ID of the VBR that you want to connect.
    Advanced Configuration When you create a VBR connection, the system automatically enables the following features in the advanced settings:
    • Associate with Default Route Table of Transit Router

      After this feature is enabled, the system automatically associates the VBR with the default route table of the transit router. Network traffic is forwarded based on the routes in the default route table.

    • Propagate System Routes to Default Route Table of Transit Router

      After this feature is enabled, the routes of the VBR are propagated to the default route table of the transit router.

    • Propagate Routes to VBR

      After this feature is enabled, the system automatically advertises the routes in the route table that is associated with the VBR to the VBR.

    To manually disable the features, clear the check boxes in the advanced settings. After the features are disabled, you can manually associate the VPC with custom route tables and configure route learning. For more information, see Create associated forwarding correlation and Create route learning correlation.

  5. Click OK.

Connect a VBR to a Basic Edition transit router

  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 CEN details page, you can use one of the following methods to navigate to the Connection with Peer Network Instance page and create a network instance connection:
    • Find the section that displays the types of network instances and click the Add a network instance icon next to the type of network instance that you want to manage. In this example, the Add a network instance icon next to VBR is selected.
      Note If no transit router is created for the CEN instance, you can use this method to create the first connection to the network instance.
    • On the Transit Router tab, find a transit router and click Create Connection in the Actions column.
  4. On the Connection with Peer Network Instance page, set the following parameters to configure the network instance connection.
    Parameter Description
    Network Type Select Virtual Border Router (VBR).
    Region Select the region where the network instance is created.
    Transit Router Displays transit routers that are created in the selected region.

    If no transit router is found in the selected region, the system automatically creates a transit router.

    Resource Owner ID Select the type of account to which the network instance that you want to connect belongs.

    CEN allows you to connect network instances that belong to the same account or different accounts.

    • If the network instance that you want to connect and the CEN instance belong to the same account, select Your Account.
    • If the network instance that you want to connect and the CEN instance belong to different accounts, select Different Account and enter the UID of the network instance owner.
    Network Instance Select the ID of the network instance that you want to connect.
  5. Click OK.

What to do next

After you create the network instance connection, you can view information about the connection by using one of the following methods:
  • Navigate to the CEN details page and click the ID of the transit router that is deployed in the same region as the network instance. On the Intra-region Connections tab, you can view network instances that are connected to the transit router in the region that you specified. For more information, see View network instance connections.
  • Navigate to the CEN details page and click the Resource Topology tab. On the Resource Topology tab, you can view network instances that are attached to the current CEN instance. For more information, see View resource topology.