Cloud Enterprise Network:Transit routers

Create a 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. Go to the Basic Information > Transit Router tab and click Create Transit Router.

4. In the Create Transit Router dialog box, configure the parameters and click OK. The following table describes the parameters.

   Parameter	Description
   Region	The region where the transit router will be created.
   Edition	The edition of the transit router is displayed. The system automatically displays the available edition in the current region. For more information about the regions that support Basic and Enterprise Edition transit routers, see Regions and zones supported by transit routers.
   Enable Multicast	Select whether you want to enable the multicast feature. Multicast is disabled by default. Note Only Enterprise Edition transit routers in certain regions support multicast. For more information, see Multicast overview.
   Name	The name for the transit router.
   Description	The description for the transit router.
   Tag	Add tags to the Enterprise Edition transit router. Tag Key: The tag key can be up to 64 characters in length. It cannot be an empty string or start with acs: or aliyun or contain http:// or https://. Tag Value: The tag value can be an empty string with a maximum length of 128 characters. It cannot start with acs: or aliyun or contain http:// or https://. You can add one or more tags to an Enterprise Edition transit router. For more information about tags, see Manage tags.
   transit router CIDR	Specify CIDR blocks for the transit router. This custom CIDR block is assigned to the transit router and functions like a loopback interface on a physical router. It is used to assign IP addresses for IPsec-VPN connections. For more information, see transit router CIDR blocks.

View the edition of a transit router

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 Instances page, click the ID of the CEN instance that you want to manage.

3. To view the edition of a transit router, use the following methods:

   • Go to the Basic Information > Transit Router tab, find the target transit router, and then check the Edition column.

   • On the Basic Information > transit router tab, click the ID of the target transit router. On the details page of the transit router, click the Basic Information tab and check the Edition of the transit router.

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 requirements are met:

• The transit router has no connections. For more information, see the following topics:

  • Delete a network instance connection

  • Delete an inter-region connection

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

• The default route table contains no custom route entries, prefix lists, or aggregate routes. For more information, see the following topics:

  • Delete a custom route from an Enterprise Edition transit router

  • Disassociate a prefix list from a transit router route table

  • Delete an aggregate route

• No multicast domains exist on the transit router. For more information, see Delete a multicast domain.

• No traffic marking policies exist on the transit router. For more information, see Delete a traffic marking policy.

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. Go to the Basic Information > Transit Router tab, find the transit router to delete, and then click Delete in the Actions column.

4. In the Delete Transit Router message, check the ID of the transit router and click OK.

Related operations

• CreateTransitRouter: creates an Enterprise Edition transit router.

• ListTransitRouters: queries the information about a transit router.

• DeleteTransitRouter: deletes a transit router.