RIP Version 1 - Routing Protocols and Concepts - page 211

Table 5-5 Addressing Table for Scenario B

Device Interface IP Address Subnet Mask Default Gateway

R1 Fa0/0 172.30.1.1 255.255.255.0 —

S0/0/0 172.30.2.1 255.255.255.0 —

R2 Fa0/0 172.30.3.1 255.255.255.0 —

S0/0/0 172.30.2.2 255.255.255.0 —

S0/0/1 192.168.4.9 255.255.255.252 —

R3 Fa0/0 192.168.5.1 255.255.255.0 —

S0/0/1 192.168.4.10 255.255.255.252 —

PC1 NIC 172.30.1.10 255.255.255.0 172.30.1.1

PC2 NIC 172.30.3.10 255.255.255.0 172.30.3.1

PC3 NIC 192.168.5.10 255.255.255.0 192.168.5.1

Sometimes when changing the IP address on a serial interface, you might need to reset
that interface by using the shutdown command, waiting for the LINK-5-CHANGED
message, and then using the no shutdown command. This process will force the IOS to
starting using the new IP address:

R1(config)# int s0/0/0
R1(config-if)# ip add 172.30.2.1 255.255.255.0
R1(config-if)# shutdown

%LINK-5-CHANGED: Interface Serial0/0/0, changed state to administratively
down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state
to down
R1(config-if)# no shutdown

%LINK-5-CHANGED: Interface Serial0/0/0, changed state to up
R1(config-if)#
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/0, changed state
to up

Verify that routers are active. Step 2.

After reconfiguring all the interfaces on all three routers, verify that all necessary inter-
faces are active with the show ip interface brief command.

Remove the RIP configurations from each router.

Step 3.

Although you can remove the old network commands with the no version of the com-
mand, it is more efficient to simply remove RIP and start over. Remove the RIP configura-
tions from each router with the no router rip global configuration command. This will
remove all the RIP configuration commands including the network commands:

R1(config)# no router rip

R2(config)# no router rip

R3(config)# no router rip