EIGRP Router ID

Written by Rene Molenaar on 15 September 2011. Posted in EIGRP

Scenario:

Your colleague asks for your help with a strange EIGRP problem. He redistributed a network into EIGRP but for some reason it doesn't show up in the routing table of one of the routers. You verify the redistribution commands are looking good and there are filters in action. Let's see if you can find the root of this problem...

Goal:

All IP addresses have been preconfigured for you.
Configure EIGRP on all FastEthernet interfaces.
Redistribute the loopback interface on router Spy into EIGRP.
Ensure router CopyCat does not see network 2.2.2.0 /24 in it's routing table without applying any filtering techniques.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

EIGRP Router ID Network Topology

Video Solution:

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Comments (3)

bobhat
2011-11-29 01:10:24

Can you give me a clue? Thought this would be easy but finding a bit difficult with out using filtering.

ReneMolenaar
2011-12-09 21:02:25

Hi John,

This is one of the EIGRP 'gotchas'. If two EIGRP routers share the same router ID then your router will not accept any external prefixes. Try changing the router ID on the router(s) and you'll find the answer

Rene

bobhat
2012-01-12 00:10:04

Cool. The clue was in the name. Have to store the answer away in my brain..

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