Learning by Doing: CISCO Certified Network ... - SCN Research

company and control access between them. There are three types of routes that are
advertised with IGRP: internal, system and external. You will learn more about these in
a later lab.
Like RIP we must first enable IGRP and then advertise, publish or associate our
networks with IGRP (all three things are the same…I have seen it many different ways
on tests—hint-hint). IGRP shares characteristics of RIP that we saw in Part 2: it does not
pass subnet mask information (geek speak: it truncates at the classful boundary”).
Step-By-Step Instructions:
1. Set up and cable the lab as shown. Then set up the basics and interfaces on
each router.
2. Add in IGRP as the routing protocol and advertise, publish or associate the
networks like this:
john(config)#router igrp 38
john(config-router)#network 184.34.0.0
john(config-router)#network 184.35.0.0
draper(config)#router igrp 38
draper(config-router)#network 184.35.0.0
draper(config-router)#network 184.36.0.0
Notice how I picked (out of thin air) to use #38 as my autonomous system
number. It really does not matter which one I use just as long as I use the
same one on both sides. Notice how I advertised (published/associated) my
networks at the classful boundary…a limitation of IGRP.
3. Test by pinging from one workstation to the other. It should work just fine.
Do a show ip route. You should see something like this:
draper#sh 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
I 184.34.0.0/16 [100/8576] via 184.35.67.1, 00:00:06, Serial0/1
C 184.35.0.0/16 is directly connected, Serial0/1
C 184.36.0.0/16 is directly connected, Ethernet0/0
draper#
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