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Author RIP / IGRP query
benedict

2002-08-08, 6:39 pm

First, I configured RIP in RouterA with a Network 192.25.0.0.

sh ip route ouput shows "R" routes

Second I configured igrp with as 100 and network 192.25.0.0

sh ip route output shows "I" routes no more "R" routes

Sh ip protocol output shows that both Rip and Igrp are configured

Question: Why were the "R" routes remove? Shouldn't both "R" and "I" routes remain in the routing table?

Same config done in RouterB.
mikop

2002-08-08, 6:50 pm

igrp has better AD than rip so its route is injected into the table.
benedict

2002-08-08, 7:54 pm

I understand, but why is the "R" route removed?

Do you mean that "R" and "I" routes can not coexist in a routing table?
SureshHomepage

2002-08-08, 10:15 pm

A routing table would install a route if it finds it as a cost wise feasible one and has better AD.

In your case the router has got 2 means of reachig your detination network, one through RIP and another through IGRP. It has chosen the route by a routing protocol whose AD is better and in our case it is IGRP. The reason is IGRP is more trustworthy (better AD) than RIP.

Hope this would help you better.
benedict

2002-08-09, 2:01 am

Sorry for being stubborn.

But isnt 4 the default number of ip routes, to the same subnet, a router can keep and that the maximum is 6?

Shouldnt the router kept the "R" routes too because of the above concept?

mikop

2002-08-09, 2:28 am

http://www.cisco.com/warp/public/105/46.html
makyol46

2002-08-09, 6:33 am

I think if you change routing protocol. youe configration table also changed and last routing protocol is seen your configration protocols .. do you think where is find routersimulation
benedict

2002-08-09, 4:52 pm

Thanks Everyone and to Mikop and SureshHomepage.
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