Configuring OSPF route redistribution

As shown in Figure 39, all the switches run OSPF, and the AS is divided into three areas. Switch A and Switch B act as ABRs to forward routes between areas. Switch C is configured as an ASBR to redistribute external routes (static routes). Routing information is propagated properly in the AS.

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

2. Configure OSPF basic functions. (See "Configuring OSPF basic functions")

3. Configure OSPF to redistribute routes:

   # On Switch C, configure a static route destined for network 3.1.2.0/24.

   <SwitchC> system-view
   [SwitchC] ip route-static 3.1.2.1 24 10.4.1.2
   

   # On Switch C, configure OSPF to redistribute static routes.

   [SwitchC] ospf 1
   [SwitchC-ospf-1] import-route static
   

4. Verify the configuration:

   # Display the ABR/ASBR information of Switch D.

   <SwitchD> display ospf abr-asbr
   
             OSPF Process 1 with Router ID 10.5.1.1
                     Routing Table to ABR and ASBR
   
    Type        Destination     Area            Cost  Nexthop         RtType
    Intra       10.3.1.1        0.0.0.2         10    10.3.1.1        ABR
    Inter       10.4.1.1        0.0.0.2         22    10.3.1.1        ASBR
   

   # Display the OSPF routing table of Switch D.

   <SwitchD> display ospf routing
   
             OSPF Process 1 with Router ID 10.5.1.1
                      Routing Tables
   
    Routing for Network
    Destination        Cost     Type    NextHop         AdvRouter       Area
    10.2.1.0/24        22       Inter   10.3.1.1        10.3.1.1        0.0.0.2
    10.3.1.0/24        10       Transit 10.3.1.2        10.3.1.1        0.0.0.2
    10.4.1.0/24        25       Inter   10.3.1.1        10.3.1.1        0.0.0.2
    10.5.1.0/24        10       Stub    10.5.1.1        10.5.1.1        0.0.0.2
    10.1.1.0/24        12       Inter   10.3.1.1        10.3.1.1        0.0.0.2
   
    Routing for ASEs
    Destination        Cost     Type    Tag         NextHop         AdvRouter
    3.1.2.0/24         1        Type2   1           10.3.1.1        10.4.1.1
   
    Total Nets: 6
    Intra Area: 2  Inter Area: 3  ASE: 1  NSSA: 0