Configure the Stub Area, ASBR, and Route Distribution

See Creating the Base Configuration for Example Topologies for prerequisite configurations for SEFOS4, SEFOS5, and SEFOS7. See IPv6 Example Topology Interface and Host Addresses for the sample configuration of the stub, ASBR, and route redistribution areas.

This example shows how to configure SEFOS4 as an ASBR router for redistributing the external routes into the OSPF domain. This example also shows how to configure area 0.0.0.4 of SEFOS5 as a stub area, and how to configure area 0.0.0.4 of SEFOS7 as a stub area with external routes that are not redistributed into the stub area.

1. Configure SEFOS4 as an ASBR router.

   SEFOS# configure terminal
   SEFOS(config)# ipv6 router ospf
   SEFOS(config-router)# router-id 10.0.0.4
   SEFOS(config-router)# asbr router
   SEFOS(config-router)# redistribute static
   SEFOS(config-router)# exit
   SEFOS(config)# ipv6 route 3333:: 96 fec0::4444:0:2
   SEFOS(config)# exit

2. Configure a stub area in SEFOS5.

   SEFOS# configure terminal
   SEFOS(config)# ipv6 router ospf
   SEFOS(config-router)# router-id 10.0.0.5
   SEFOS(config-router)# area 0.0.0.4 stub
   SEFOS(config-router)# exit

3. Configure a stub area in SEFOS7.

   SEFOS# configure terminal
   SEFOS(config)# ipv6 router ospf
   SEFOS(config-router)# router-id 10.0.0.7
   SEFOS(config-router)# area 0.0.0.4 stub
   SEFOS(config-router)# exit

4. View the configuration details in SEFOS4.

   SEFOS# show ipv6 ospf route
    
   ****************************************************
   Dest/Prefix-Length      NextHop/IfIndex      Cost     Rt.Type     Area
   fec0::3003:0:0/96 fe80::207:2ff:fe03:401/vlan4   2   interArea   0.0.0.0
   fec0::4444:0:0/96                    :: /vlan4   1   intraArea   0.0.0.0
    
   SEFOS# show ipv6 ospf  database as-external detail
    
   Age: 0   Seconds            LS Type: External Lsa
   Link State Id: 0.0.0.2      Adv Rtr Id: 10.0.0.4
   Sequence: 0x80000001        Checksum: 0x0bc4    Length: 56
   Metric Type: Ext Type2      Metric: 0xa
   Prefix Length: 96           Prefix Options: 0x00
   Referenced LS Type: 0
   Address Prefix: 3333::
   Fw Address Prefix: 3333::fec0:0
   External Route Tag: 0

5. Ensure that the external routes are redistributed in SEFOS5.

   SEFOS# show ipv6 ospf route
    
   OSPFV3 Process Routing Table
   Dest/Prefix-Length   NextHop/IfIndex          Cost         Rt.Type     Area
   3333::/96    fec0::4444:0:2/vlan4    10       type2Ext    0.0.0.0SEFOS# show ipv6 ospf  database as-external detail
   fec0::3003:0:0/96            ::/vlan5     1       intraArea   0.0.0.4
   fec0::4444:0:0/96            ::/vlan4     1       intraArea   0.0.0.3Age: 63  Seconds            LS Type: External LsaLink State Id: 0.0.0.2      Adv Rtr Id: 10.0.0.4Sequence: 0x80000001        Checksum: 0x0bc4    Length: 56Metric Type: Ext Type2      Metric: 0xaPrefix Length: 96           Prefix Options: 0x00Referenced LS Type: 0Addres Prefix: 3333::Fw Addres Prefix: 3333::fec0:0External Route Tag: 0