Configure the Stub Area, ASBR, and Route Distribution

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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.

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

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

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

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

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