Configuring a Dynamic Routing Protocol to Import Direct Routes

After you associate direct routes with a Virtual Router Redundancy Protocol (VRRP) group, configure a dynamic routing protocol to import the direct routes so that the path selection by the dynamic routing protocol can be controlled.

Context

After direct routes are associated with a VRRP group, VRRP-enabled devices modify the cost of each direct route to the virtual IP network segment based on the VRRP status. To control the path by a dynamic routing protocol, enable the dynamic routing protocol to import direct routes and inherit the costs from the imported direct routes.

Currently, dynamic routing protocols include the Interior Gateway Protocol (IGP) and Border Gateway Protocol (BGP). If an IGP is configured to import direct routes, routing information protocol (RIP) cannot inherit costs from the imported direct routes. This section describes how to configure Open Shortest Path First (OSPF), Intermediate System to Intermediate System (IS-IS), and BGP to import direct routes.

Procedure

Configure OSPF to import direct routes.
1. Run system-view
  The system view is displayed.
2. Run ospf [ process-id ]
  The OSPF process view is displayed.
3. Run import-route direct
  OSPF is configured to import direct routes.
4. Run default cost inherit-metric
  OSPF is enabled to inherit the costs from the imported direct routes.
  - The default (OSPF) command has a lower priority than the apply cost command. If the apply cost command is run, it overrides the default (OSPF) command. Therefore, before running the default (OSPF) command, ensure that the apply cost command is not run.
  - Do not run the default cost cost-value command after you run the default cost inherit-metric command. If the default cost cost-value command is run after the default cost inherit-metric command, the default cost cost-value command overrides the default cost inherit-metric command.
5. Run commit
  The configuration is committed.
Configure IS-IS to import direct routes.
1. Run system-view
  The system view is displayed.
2. Run isis [ process-id ]
  The IS-IS process view is displayed.
3. Run import-route direct inherit-cost
  IS-IS is configured to import direct routes and to inherit the costs from the imported direct routes.
4. Run commit
  The configuration is committed.
Configure BGP to import direct routes.
1. Run system-view
  The system view is displayed.
2. Run bgp as-number
  The BGP process view is displayed.
3. Run import-route direct
  BGP is configured to import direct routes.
  
  BGP automatically inherits the costs from the imported direct routes. The inherited costs are shown as the multi-exit discrimination (MED) values.
4. Run commit
  The configuration is committed.