From: Nick Shah (nshah@connect.com.au)
Date: Tue Sep 17 2002 - 20:56:54 GMT-3
John
Whats happening here is prolly... (These are just a pointers, I will try to
lab up ur scenario tonight)
* The networks which are running OSPF are getting included in IGRP/RIP,
same for RIP network (getting included in IGRP).
* Are you using distribute lists to allow only specific networks in/out of
redistributed protocols
* Are you redistributing between RIP & IGRP on R2 ?
* The trouble seems to be arising out of OSPF learning the prefixes back
from IGRP and since OSPF distance is lower than RIP, on other hand IGRP's
distance is lower than OSPF, so unless you are using that ISDN link for some
backup, filter out (if using for backup, then increase IGRP's distance)
* Filter OSPF routes on R2 coming from frame relay to disallow RIP
redistributed routes (which could have been fed back into OSPF, since there
are 2 redistribution points)
rgds
Nick
----- Original Message -----
From: "Paglia, John (USPC.PCT.Hopewell)" <JPaglia@NA2.US.ML.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, September 18, 2002 6:08 AM
Subject: IGRP Disaster
> I cam across a troublesome event today in my practices and I am at a bit
of
> a loss, thus I am asking for some expertise...
>
> isdn --------r5-----eth----r4
> | |
> | |
> | frame
> | |
> r2-----------frame----------r3
> |
> |
> serial
> _|__
> r1
>
> r1 to r2 - RIP
> r2 to r3 to r4 - OSPF
> r4 to r5 and isdn to r2 - igrp
>
> I have rip mutually redistributing into ospf and all is well, I can ping
all
> loopbacks and connecting network addresses. Then I configure IGRP on r2,
r4
> and r5 and redistribute w/ ospf using route maps at both points, and the
fun
> begins!!!
>
> Once this is done, and with the isdn still down, the network btwn r1 and
r2
> disappears from every router, making a ping from r1 impossible. All other
> networks are present. When ISDN is up (interface backup on r5 igrp
> interface), the net btwn r1 and r2 shows up on r5 only. Meanwhile, the
> loopback on r5 will not show up on r1 and vice versa.
>
> Is there some basic IGRP condition that is causing this to happen? Any
> ideas???
>
> Thanks,
> Pags
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