Transit routers

Create a transit router

1. Log on to the CEN console.

2. On the CEN Instance page, click the ID of the CEN instance that you want to manage.

3. On the Basic Settings > Transit Router tab, click Create Transit Router.

4. In the Create Transit Router dialog box, set the parameters for the transit router and click OK.

   Parameter	Description
   Region	Select the region where you want to create the transit router.
   Edition	Displays the edition of the transit router. The system automatically selects the edition available for the chosen region. For more information about the regions that support Basic Edition and Enterprise Edition transit routers, see Transit router editions.
   Enable Multicast	Enables multicast for the transit router. This feature is disabled by default. Note Only Enterprise Edition transit routers in specific regions support multicast. For more information, see Multicast.
   Name	Enter a name for the transit router.
   Description	Enter a description for the transit router.
   Tag	Add tags to the transit router. This setting applies only to Enterprise Edition transit routers. Tag key: cannot be an empty string. The key can be up to 64 characters in length and cannot start with aliyun or acs:. It cannot contain http:// or https://. Tag value: can be an empty string. The value can be up to 128 characters in length and cannot start with aliyun or acs:. It cannot contain http:// or https://. You can add multiple tags to an Enterprise Edition transit router. For more information about tags, see Tags.
   Transit Router CIDR	The CIDR block for the transit router. This setting applies only to Enterprise Edition transit routers. This CIDR block, which functions similarly to that of a loopback interface, is used by the transit router to allocate IP addresses for IPsec VPN connections . For more information, see Transit router CIDR.

View transit router edition

This section describes how to view the edition of an existing transit router in the console.

1. Log on to the CEN console.

2. On the CEN Instance page, click the ID of the CEN instance that you want to manage.

3. You can view the edition of a transit router in either of the following ways:

   • On the Basic Settings > Transit Router tab, find the target transit router and view its edition in the Edition column.

   • On the Basic Settings > Transit Router tab, click the ID of the target transit router. On the details page of the transit router, click the Basic Settings tab. On the Basic Settings tab, view the Version.

Delete a transit router

You can delete transit routers that you no longer need. Before you delete a transit router, make sure that the following prerequisites are met:

• Ensure that the transit router has no network instance attachments or inter-region connections. For more information, see the following topics:

  • Delete a network instance attachment

  • Delete an inter-region connection

• Ensure that the transit router has no custom route tables. For more information, see Delete a custom route table.

• Ensure that the default route table of the transit router contains no custom route entries, prefix lists, or aggregate routes. For more information, see the following topics:

  • Delete a custom route of an Enterprise Edition transit router

  • Disassociate a prefix list

  • Delete an aggregate route

• Ensure that the transit router has no multicast domains. For more information, see Delete a multicast domain.

• Ensure that the transit router has no traffic marking policies. For more information, see Delete a traffic marking policy.

1. Log on to the CEN console.

2. On the CEN Instance page, click the ID of the CEN instance that you want to manage.

3. On the Basic Settings > Transit Router tab, find the target transit router and click Delete in the Actions column.

4. In the Delete Transit Router dialog box, confirm the instance ID and click OK.

Related APIs

• CreateTransitRouter: Creates an Enterprise Edition transit router.

• ListTransitRouters: Retrieves a list of transit routers.

• DeleteTransitRouter: Deletes a transit router.