From: Alex Steer (alex.steer@eison.co.uk)
Date: Sat Sep 08 2007 - 07:42:57 ART
Can anybody offer any info on this as I still haven't found a dynamic
solution :(
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Alex Steer
Sent: 04 September 2007 08:59
To: ccielab@groupstudy.com
Subject: redistribution problem
Hi groupstudy
I'm after some input regarding a redistribution problem I'm having. It
actually started off as part of a lab and has now turned into a slightly
different question that I don't seem to be able to answer without some
help, hint :)
Anyway. Here is the topology.
R1
RIP1 domain----EIGRP domain-- --OSPF domain----RIP2 domain
R2
The problem involves the looping of traffic sent from either the RIP2
domain or the OSPF domain to the RIP1 domain. Due to EIGRPs EX distance
of 170 for the RIP1 domain both routers prefer the OSPF distance of 110
and pass this traffic back into the OSPF domain.
Although this may not be too much of a problem I have a few added points
which have stopped me being able to answer this.
1.All domains should have full reachability information about all other
domains.
2.This reachability must be completely dynamic
3.The number of prefix's received from each domain is
discontiguous/dynamic/too large to match the actual routes. i.e (The
solution must be dynamic so that new networks added in this topology do
not suffer from this problem without manually added a route to an ACL)
4.The failure of either R1 or R2 should not result in any loss of
reachability
I have set the EX OSPF distance to 171 to resolve this but then the
problem happens identically in the opposite direction with regards to
RIP1/EIGRP traffic to the RIP2 domain.
I have thought the answer be tagged of routes though I haven't found a
way to use tagging in a way that is useful to solving this problem.
Haven't had much luck with distribute lists either as they can't match
routes without knowing what routes to match.
Can someone please put me out of my misery on this question as I'm
stuck.
Thank you in advance
Alex
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