Configure OSPF Dynamic Routing

This task describes how to configure dynamic routing using the redistribution feature of the OSPF protocol in SEFOS. This task verifies that the reachability between two hosts is established after learning the in-between routes dynamically through OSPF.

See Routing Feature Topology for the topology of this task.

1. Verify that SEFOS-1 and SEFOS-2 still have the configuration information that you saved.

   See Configure Static Unicast Route Entries.

   The basic VLAN configuration for dynamic routing is similar to the basic VLAN configuration for static routing. If the configuration information was not saved on SEFOS-1 and SEFOS-2, follow Step 1 through Step 6 in Configure Static Unicast Route Entries.

   If SEFOS-1 or SEFOS-2 is a third-party switch, configure the basic VLAN and the dynamic routing as recommended by the switch's manufacturer.

2. Enable OSPF on SEFOS-1.

   SEFOS-1# configure terminal
   SEFOS-1(config)# router ospf
   SEFOS-1(config-router)# asBR router
   SEFOS-1(config-router)# router-id 10.0.0.201
   SEFOS-1(config-router)# network 20.0.0.201 area 0.0.0.0
   SEFOS-1(config-router)# network 10.0.0.201 area 0.0.0.0
   SEFOS-1(config-router)# redistribute all
   SEFOS-1(config-router)# end

3. Enable OSPF on SEFOS-2.

   SEFOS-2# configure terminal
   SEFOS-2(config)# router ospf
   SEFOS-2(config-router)# asBR router
   SEFOS-2(config-router)# router-id 40.0.0.200
   SEFOS-2(config-router)# network 20.0.0.200 area 0.0.0.0
   SEFOS-2(config-router)# network 40.0.0.200 area 0.0.0.0
   SEFOS-2(config-router)# redistribute all
   SEFOS-2(config-router)# end

   If SEFOS-2 is a third-party switch, verify that the OSPF protocol is enabled on SEFOS-2 and that related configurations are applied accordingly.

4. Check the neighbor router status of SEFOS-1.

   SEFOS-1# show ip ospf neighbor
    
   Vrf default
    
   Neighbor-IDPriStateDeadTimeAddress    Interface 
   ------------------------------------------- 
   40.0.0.2001FULL/DR  3920.0.0.200 vlan20
   SEFOS-1# show ip route
   Codes: C - connected, S - static, R - rip, B - bgp, O - ospf
   C 10.0.0.0/24 is directly connected, vlan10
   C 20.0.0.0/24 is directly connected, vlan20
   O 40.0.0.0/24 [2] via 20.0.0.200

5. Verify the neighbor router status of SEFOS-2.

   SEFOS-2# show ip ospf neighbor
    
   Vrf default 
   Neighbor-ID Pri State DeadTime Address Interface 
   ----------- --- ----- -------- ------- --------- 
   SEFOS-2# show ip route
   10.0.0.201 1 FULL/BACKUP 32 20.0.0.201 vlan20
   Codes: C - connected, S - static, R - rip, B - bgp, O - ospf 
    
   O 10.0.0.0/24 [2] via 20.0.0.201 
   C 20.0.0.0/24 is directly connected, vlan20 
   C 40.0.0.0/24 is directly connected, vlan40

   If SEFOS-2 is a third-party switch, use the appropriate command to verify the neighbor router status.

6. Verify connectivity between SEFOS-1 and SEFOS-2 with the ping command.

Related Information

• Configure Static Unicast Route Entries

• Add Static Routes

• Configure RIP Dynamic Routing

• Disable OSPF Dynamic Routing