OSPFv3 NSSA area configuration example

As shown in Figure 89:

• Configure OSPFv3 on all switches and split the AS into three areas.

• Configure Switch B and Switch C as ABRs to forward routing information between areas.

• Configure Area 1 as an NSSA area and configure Switch A as an ASBR to redistribute static routes into the AS.

1. Configure IPv6 addresses for interfaces. (Details not shown.)

2. Configure basic OSPFv3 (see "OSPFv3 stub area configuration example").

3. Configure Area 1 as an NSSA area:

   # Configure Switch A.

   [SwitchA] ospfv3
   [SwitchA-ospfv3-1] area 1
   [SwitchA-ospfv3-1-area-0.0.0.1] nssa
   [SwitchA-ospfv3-1-area-0.0.0.1] quit
   [SwitchA-ospfv3-1] quit
   

   # Configure Switch B.

   [SwitchB] ospfv3
   [SwitchB-ospfv3-1] area 1
   [SwitchB-ospfv3-1-area-0.0.0.1] nssa
   [SwitchB-ospfv3-1-area-0.0.0.1] quit
   [SwitchB-ospfv3-1] quit
   

   # Display OSPFv3 routing information on Switch A.

   [SwitchA] display ospfv3 1 routing
   
                  OSPFv3 Process 1 with Router ID 1.1.1.1
   -------------------------------------------------------------------------
    I  - Intra area route,  E1 - Type 1 external route,  N1 - Type 1 NSSA route
    IA - Inter area route,  E2 - Type 2 external route,  N2 - Type 2 NSSA route
    *  - Selected route
   
    *Destination: 2001::/64
     Type       : IA                                        Cost     : 2
     NextHop    : FE80::20C:29FF:FE74:59C6                  Interface: Vlan200
     AdvRouter  : 2.2.2.2                                   Area     : 0.0.0.1
     Preference : 10
   
    *Destination: 2001:1::/64
     Type       : I                                         Cost     : 1
     Nexthop    : ::                                        Interface: Vlan200
     AdvRouter  : 1.1.1.1                                   Area     : 0.0.0.1
     Preference : 10
   
    *Destination: 2001:2::/64
     Type       : IA                                        Cost     : 3
     NextHop    : FE80::20C:29FF:FE74:59C6                  Interface: Vlan200
     AdvRouter  : 2.2.2.2                                   Area     : 0.0.0.1
     Preference : 10
   
    Total: 3
    Intra area: 1         Inter area: 2         ASE: 0         NSSA: 0
   

4. Configure route redistribution:

   # Configure an IPv6 static route, and configure OSPFv3 to redistribute the static route on Switch A.

   [SwitchA] ipv6 route-static 1234:: 64 null 0
   [SwitchA] ospfv3 1
   [SwitchA-ospfv3-1] import-route static
   [SwitchA-ospfv3-1] quit
   

   # Display OSPFv3 routing information on Switch D.

   [SwitchD] display ospfv3 1 routing
   
                  OSPFv3 Process 1 with Router ID 4.4.4.4
   -------------------------------------------------------------------------
    I  - Intra area route,  E1 - Type 1 external route,  N1 - Type 1 NSSA route
    IA - Inter area route,  E2 - Type 2 external route,  N2 - Type 2 NSSA route
    *  - Selected route
   
    *Destination: 2001::/64
     Type       : IA                                        Cost     : 2
     NextHop    : FE80::20C:29FF:FEB9:F2EF                  Interface: Vlan400
     AdvRouter  : 3.3.3.3                                   Area     : 0.0.0.2
     Preference : 10
   
    *Destination: 2001:1::/64
     Type       : IA                                        Cost     : 3
     NextHop    : FE80::20C:29FF:FEB9:F2EF                  Interface: Vlan400
     AdvRouter  : 3.3.3.3                                   Area     : 0.0.0.2
     Preference : 10
   
    *Destination: 2001:2::/64
     Type       : I                                         Cost     : 1
     NextHop    : ::                                        Interface: Vlan400
     AdvRouter  : 4.4.4.4                                   Area     : 0.0.0.2
     Preference : 10
   
    *Destination: 1234::/64
     Type       : E2                                        Cost     : 1
     NextHop    : FE80::20C:29FF:FEB9:F2EF                  Interface: Vlan400
     AdvRouter  : 2.2.2.2                                   Area     : 0.0.0.2
     Preference : 10
   
    Total: 4
    Intra area: 1         Inter area: 2         ASE: 1         NSSA: 0
   

   The output shows an AS external route imported from the NSSA area exists on Switch D.