How to configure Routing Protocol RIP

Using the sample network, we'll enable RIP routing for the network.

The network's configuration is as follows:

Use the command router rip and tell the RIP protocol which network to advertise (network <network #>).  Routers send RIP version 1 by default and RIP v.1 is classful, which means all the devices in the network need to use the same subnet mask. The network is entered in using the classful boundary and RIP will find the subnets to advertise since all the networks are using the same subnet mask (/24).  Below is the actual configuration for the above sample network, the interface configurations are also shown for completeness.

________________________________________
Router1
   Router1> enable
   Router1# configure terminal
   Enter configuration commands, one per line.  End with CNTL/Z.
 
   Router1(config)# interface e0
   Router1(config-if)# ip address 172.20.10.1 255.255.255.0
   Router1(config-if)# no shutdown
 
   Router1(config-if)# interface s0
   Router1(config-if)# ip address 172.20.1.1 255.255.255.0
   Router1(config-if)# no shutdown
   Router1(config-if)# exit
 
   Router1(config)# router rip    
   Router1(config-router)# network 172.20.0.0
________________________________________
Router2
   Router2> enable
   Router2# configure terminal
   Enter configuration commands, one per line.  End with CNTL/Z.
 
   Router2(config)# interface e0
   Router2(config-if)# ip address 172.20.20.1 255.255.255.0
   Router2(config-if)# no shutdown
 
   Router2(config-if)# interface s0
   Router2(config-if)# ip address 172.20.1.2 255.255.255.0
   Router2(config-if)# no shutdown
 
   Router2(config-if)# interface s1
   Router2(config-if)# ip address 172.20.2.1 255.255.255.0
   Router2(config-if)# no shutdown 
   Router2(config-if)# exit
 
   Router2(config)# router rip    
   Router2(config-router)# network 172.20.0.0
________________________________________
Router3
   Router3> enable
   Router3# configure terminal
   Enter configuration commands, one per line.  End with CNTL/Z.
 
   Router3(config)# interface e0
   Router3(config-if)# ip address 172.20.30.1 255.255.255.0
   Router3(config-if)# no shutdown
 
   Router3(config-if)# interface e1
   Router3(config-if)# ip address 172.20.35.1 255.255.255.0
   Router3(config-if)# no shutdown
 
   Router3(config-if)# interface s0
   Router3(config-if)# ip address 172.20.2.2 255.255.255.0
   Router3(config-if)# no shutdown 
   Router3(config-if)# exit
 
   Router3(config)# router rip    
   Router3(config-router)# network 172.20.0.0

Viewing the routing table
You can use the show ip route command to view the router's routing table.
   Router3#show ip route
   Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
          D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
          N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
          E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
          i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
          U - per-user static route, o - ODR
 

    Gateway of last resort is not set
        172.20.0.0/24 is subnetted, 6 subnets
   R       172.20.1.0  [120/2] via 172.20.2.1, 00:00:04, Serial0
   R       172.20.10.0  [120/2] via 172.20.2.1, 00:00:04, Serial0
   R       172.20.20.0  [120/2] via 172.20.2.1, 00:00:04, Serial0
   C       172.20.2.0 is directly connected, Serial0
   C       172.20.35.0 is directly connected, Ethernet1
   C       172.20.30.0 is directly connected, Ethernet0Stopping RIP 

Propagation Use the passive-interface command to stop RIP broadcasts from going out an interface.  The interface will still receive RIP updates, but it won't send them on the network that the interface is connected to.

   Router3(config)# router rip
   Router3(config-router)# passive-interface serial 1

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Neel Kamal