Enterprise Edition transit routers support custom route tables. After you create a custom route table, you can create associated forwarding correlations, route learning correlations, or custom routes in the route table. This helps you manage traffic in a more flexible manner.
Background information
An Enterprise Edition transit router has one system route table and supports custom route tables. Each Basic Edition transit router has one system route table and does not support custom route tables. For more information about transit router editions, see View the edition of a transit router.
The system route table of a transit router is isolated from the custom route tables. The following content describes the system route table and custom route tables:
System route tables are automatically created by the system. When you create an Enterprise Edition transit router, the system automatically creates a system route table.
You can manually create custom route tables. Custom route tables are similar to virtual routing and forwarding (VRF) used by traditional routers. A custom route table is isolated from the system route table and other custom route tables.
After you create a network instance connection, you can associate the network instance connection to a custom route table by creating an associated forwarding correlation. After you create an associated forwarding correlation, the transit router forwards the traffic of the network instance connection based on the custom route table.
Create a custom route table
Log on to the CEN console.
On the Instances page, click the ID of the CEN instance that you want to manage.
Navigate to the tab and click the ID of the transit router that you want to manage.
On the details page of the transit router, click the Route Table tab.
In the left-side section, click Create Route Table. In the Create Route Table dialog box, set the following parameters and click OK.
Parameter
Description
Transit Router
Select the transit router for which you want to create a route table.
The ID of the selected transit router is automatically displayed.
Route Table Name
Enter a name for the route table.
Description
Enter a description for the route table.
Multi-region ECMP Routing
Enable multi-region ECMP routing based on your business requirements. Multi-region ECMP routing is disabled by default.
An Enterprise Edition transit router may learn routes from multiple virtual border routers (VBRs). If the routes have the same attributes other than region IDs, network traffic is forwarded based on the region IDs in alphabetical order. If multi-region ECMP routing is enabled for VBRs and the routes have the same attributes other than region IDs, those routes are considered equal-cost routes. For more information, see Multi-region ECMP routing for VBRs in different regions.
If you want to enable multi-region ECMP routing, turn on Multi-region ECMP Routing, read the message that appears, and then click OK.
View the route tables of an Enterprise Edition transit router
Log on to the CEN console.
On the Instances page, click the ID of the CEN instance that you want to manage.
Navigate to the tab and click the ID of the transit router that you want to manage.
On the details page of the transit router, click the Route Table tab.
In the left-side section, click the route table ID.
On the route table details page, you can view the following information:
Routes of the transit router. For more information, see View routes of an Enterprise Edition transit router.
Associated forwarding correlations. For more information, see Associated forwarding.
Route learning correlations. For more information, see Route learning.
Routing policies. For more information, see Routing policy overview.
View the route tables of a Basic Edition transit router
Log on to the CEN console.
On the Instances page, click the ID of the CEN instance that you want to manage.
Navigate to the tab and click the ID of the transit router that you want to manage.
On the details page of the transit router, click the Route Table tab to view the following information:
Routes of the transit router. For more information, see View routes of a Basic Edition transit router. .
Routing policies. For more information, see Routing policy overview.
Delete a custom route table
You can delete a custom route table that you no longer use. You cannot delete system route tables.
Before you delete a custom route table, make sure that the following requirements are met:
The custom route table does not contain associated forwarding correlations. For more information about how to delete associated forwarding correlations, see Delete an associated forwarding correlation.
The custom route table does not contain route learning correlations. For more information about how to delete route learning correlations, see Delete a route learning policy.
The custom route table does not contain custom routes. For more information about how to delete custom routes, see Delete a custom route from a route table of an Enterprise Edition transit router.
Log on to the CEN console.
On the Instances page, click the ID of the CEN instance that you want to manage.
Navigate to the tab and click the ID of the transit router that you want to manage.
On the details page of the transit router, click the Route Table tab.
In the left-side section, click the route table ID.
In the Route Table Details section, click Delete.
In the Delete Route Table message, click OK.
References
CreateTransitRouterRouteTable: Creates a custom route table for an Enterprise Edition transit router.
UpdateTransitRouterRouteTable: Modifies the name and description of an Enterprise Edition transit router route table.
ListTransitRouterRouteTables: Queries the route tables of an Enterprise Edition transit router.
DeleteTransitRouterRouteTable: Deletes a custom route table from an Enterprise Edition transit router.