Suppress Routing Updates on All the Interfaces

All the OSPF interfaces created after you perform this procedure will be passive. This situation is useful in ISP and large enterprise networks where many of the distribution routers have more than 200 interfaces.

1. Enter Global Configuration mode in SEFOS1.

   SEFOS# configure terminal
   

2. Enable OSPF globally in the switch SEFOS1.

   SEFOS(config)# router ospf
   

3. Configure the OSPF router ID.

   SEFOS(config-router)# router-id 10.10.2.1
   

4. Suppress routing updates.

   SEFOS(config-router)# passive-interface default
   

5. Enable OSPF over the VLAN interface.

   SEFOS(config-router)# network 10.4.0.1 area 0.0.0.0
   

6. Examine the configuration details.

   SEFOS# show ip ospf interface vlan 1
    
   vlan1 is line protocol is up
   Internet Address 10.4.0.1, Mask 255.255.0.0, Area 0.0.0.0
   AS 1, Router ID 10.10.2.1, Network Type BROADCAST, Cost 1
   Transmit Delay is 1 sec, State 2, Priority 1
   No designated router on this network
   No backup designated router on this network
   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
   No Hellos (Passive interface)
   Neighbor Count is 0, Adjacent neighbor count is 0