Defining the Current Area as a Stub Area

Procedure

1. Run system-view

   The system view is displayed.

2. Run ospf [ process-id ]

   The OSPF process view is displayed.

3. Run area area-id

   The OSPF area view is displayed.

4. Run stub [ no-summary ]

   The current area is configured as a stub area.

   If the parameter no-summary is specified, an ABR is disabled from sending summary LSAs to a stub area. The parameter no-summary takes effect in the area only when the stub command is configured on an ABR.

   To configure an area as a stub area, you need to run the stub command on all switches in the area.

   AS external routes carried in Type 5 LSAs cannot be advertised within a stub area. Therefore, the switches in a stub area learn AS external routes from an ABR. The ABR automatically generates a summary LSA (Type 3 LSA) with the link state ID being 0.0.0.0 and the network mask being 0.0.0.0 and then advertises the LSA in the entire stub area.

5. (Optional) Run stub default-route-advertise backbone-peer-ignore

   The ABR is disabled from checking the neighbor status of the backbone area before it generates a Type 3 LSA carrying a default route and advertises it to the stub area.

6. Run commit

   The configuration is committed.