IGRP routing problems

2lazybutsmart

Hi guys,

I'm having some problems configuring IGRP properly between 2 routers. I have 3 networks, and they are as follows:

192.168.10.0/24 (RouterA and ComputerA are connected on that network)
192.168.20.0/24 (RouterA and RouterB are connected on this network)
192.168.30.0/24 (RouterB and ComputerB are connected on that nework)

If I run the following commands on Router A:

router igrp 10
network 192.168.10.0

and this in Router B

router igrp 10
network 192.168.30.0

It shoud work right?? I'm using classful routing....

But the IGRP routing is not displayed in the sh ip route of both rotuers.

Please help.
2lbs.

Webmaster

You'll need to add the following command to both routers:

network 192.168.20.0

bobob

You should advertise routes for all networks that each router knows about.

router A:
router igrp 10
netw 192.168.10.0
netw 192.168.20.0

router B:
router igrp 10
netw 192.168.20.0
netw 192.168.30.0

The way you had it there wasn't any igrp talk between the routers because you only enabled it on their ethernet interfaces.

2lazybutsmart

Thanks Johan!!!

That was cool. So now I understand that I always have to add the networks the routers are on too.

Everything is working properly now.

Thanks again man... I thought I was stuck with IGRP for eva.

2lbs.

pandimus

Comon 2Lbs...

Its the weekend.. time for Fragging, not routing.. Haha.

2lazybutsmart

It ain't a weekend for me pandimus. We work on your weekend and have our weekend on your workdays (Thur, Fri). Had to go through a lot to adapt to that lifestyle, but now I won't be able to keep my eyes open on Thurday morning's anymore. hahaa

And some good news for ya:

My boss was kind enough to give me an unused router (another 26xxx series!!!!!). So I don't know if I'd do my self justice by sleeping any more.

2lbs.

Webmaster

You're welcome.

The network command is used to include all local networks (interfaces) that you want to participate in the routing process. Although the network which forms the link between the two routers is known on both routers (directly connected), that only gives them knowledge about which interface packets (from one end to the other far-end) should go out, but the router needs to have the IP address of the opposite interface in its routing table to know which IP address to send the packets to (a gateway for the destination network).

2lazybutsmart

Webmaster wrote:

a gateway for the destination network

ah.. I'll never forget that one on the exam

2lbs.