CCNA Complete Guide 2nd Edition.pdf - Cisco Learning Home

- RIPv1 and IGRP are classful routing protocols and therefore use classful network addresses in
their configuration, which means that they must consider which class an interface resides in
(Class A, B, or C network) when performing tasks. Classful routing protocols do not send
subnet mask information along routing updates as they assume that all hosts and router
interfaces connected to all segments throughout the network belongs to the same classful
network and use the same subnet mask! RIPv1 and IGRP, which are distance-vector classful
routing protocols, do not support VLSM and route summarization. Note: RIPv2 supports VLSM.
- The network {classful-network-addr} router subcommand is able to figure out the IP
address class of the network address that is entered along with the command (similar to the IP
address configuration dialog in Microsoft Windows). The command will change the network
number entered along with the command to its classful entry or the major network number.
Ex: 10.1.1.0 10.0.0.0; 172.16.1.0 172.16.0.0.
- Verify the RIP configuration on RT1, RT2 and RT3 with the show ip route EXEC command:
RT1#show ip route
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, FastEthernet1/0
C 192.168.2.0/24 is directly connected, Serial0/0
R 192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:10, Serial0/0
R 192.168.4.0/24 [120/1] via 192.168.2.2, 00:00:10, Serial0/0
R 192.168.5.0/24 [120/2] via 192.168.2.2, 00:00:10, Serial0/0
RT1#
- The show ip protocols EXEC command provides an overview of all running routing
protocols when multiple routing protocols are running on a single router. It also displays other
routers that sending routing updates to the router, and all the timer values used for the operation
of the routing protocols.
RT2#sh ip protocols
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 18 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 1, receive any version
Interface Send Recv Triggered RIP Key-chain
FastEthernet1/0 1 1 2
Serial0/0 1 1 2
Serial0/1 1 1 2
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
192.168.2.0
192.168.3.0
192.168.4.0
Routing Information Sources:
Gateway Distance Last Update
192.168.2.1 120 00:00:10
192.168.4.2 120 00:00:05
Distance: (default is 120)
RT2#
86
Copyright © 2008 Yap Chin Hoong
yapchinhoong@hotmail.com