I have seen a similar case some time ago, the problem was that someone had
changed an access-list on the ethernet interface of one router, blocking
EIGRP updates on LAN. Check that and post the configurations of router 2 and
3,if it doesn't solve the problem.

Wilson, Gavin (KBPB) wrote:
> 
> Afternoon 
> 
> I was wondering if anyone could shed any light on the following
> problem. In
> the topology below: Router2 and  router3 who are connected via
> switch 1 and
> switch 2 have lost their eigrp neighbour relationship. Router1
> and router2
> still have a eigrp relationship and router4 and router3 still
> have a their
> eigrp neighbour relationship. The configurations on sw1 and sw2
> have not
> been changed. I have rebooted r2 and r3 but the neighbour
> relationships have
> not been re-established???? Any ideas as to what the problem
> could be.
> 
> 
> 
> 
>                             router1 (Production)
> router4 (DR site)
> 
> 
> 
> 
> 
>                                                             
> (remote site)
> router2              router3 
>                                                               sw1
> sw2
> 
> 
> Any advice would be much appreciated.
> 
> Cheers Gavin
> 
> 
> 
> Gavin Wilson
> Kleinwort Benson Private Bank
> Tel: 0207 4751771
> Mobile: 07989441850
> email: [EMAIL PROTECTED]
> 
> 
> 
> 
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