Configure a Default Summary Route for a Stub Area

Configuring a stub area with the no-summary option specifies that the router will neither originate nor propagate summary LSAs into the stub area, and will, instead, depend entirely on its default route. You can specify the no-summary option only in ABRs.

This example configures the IP address 0.0.0.6 as a stub area in SEFOS1 (router ID 10.0.0.1), with no summary LSAs being originated or propagated by the router to the stub area.

1. Enter Global Configuration mode in SEFOS1.

   SEFOS# configure terminal
   

2. Enable OSPF globally in SEFOS1.

   SEFOS(config)# ipv6 router ospf
   

3. Configure the OSPF router ID.

   SEFOS(config-router)# router-id 10.0.0.1
   

4. Configure the area 0.0.0.6 as a stub area.

   SEFOS(config-router)# area 0.0.0.6 stub no-summary
   SEFOS(config-router)# end
   

5. Ensure that the default summary route is set.

   SEFOS#  show ipv6 ospf areas
   OSPFV3  AREA  CONFIGURATION  INFORMATION
    
   AreaId: 0.0.0.0                 Area Type: NORMAL AREA
   Spf Calculation: 10 (times)     Area Bdr Rtr Count: 0
   As Bdr Rtr Count: 0             Area Summary: Send Summary
    
   AreaId: 0.0.0.6                 Area Type: STUB AREA
   Spf Calculation: 10 (times)     Area Bdr Rtr Count: 0
   As Bdr Rtr Count: 0             Area Summary: No Summary
   Stub Metric: 0x1                Stub Metric Type: 1