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Wednesday, March 25, 2009

Automatic routing table maintenance by routing protocol configuration, still using RIPv1 (CNA-02-003)

CCNA Exploration 4.0, Semester 2, "Automatic routing table maintenance by routing protocol configuration, still using RIPv1" Packet Tracer 5.0 practice file (CNA-02-003).

I believe many people were not quite satisfied by previous practice: the IP addresses were not the same. Now in this practice I changed all the IP addresses to the same as the first practice. We still use RIPv1 this time.

It would be much more persuasive that "automatic" ways are better than "manual" ways.

In addition to this, I also want to illustrate one "Classful" behavior in this practice. Classful world's router always summarize all subnet routes to only one route: the class network address it belongs to, when telling to other routers not in the same class network address.

We have 3 subnet routes of,, in this practice. But R3 will only see, the one B class network address they belong to.

R3#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, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is not set

R [120/1] via, 00:00:25, Serial0/0/0
C is directly connected, Serial0/0/0
C is directly connected, FastEthernet0/0
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