From: Bob Sinclair (bob@bobsinclair.net)
Date: Wed Nov 16 2005 - 23:36:25 GMT-3
John,
As a starting point, look for physical loops that cross routing domains. I
have not seen a scenario that risks routing loops in the linear topology you
show, copied below. How would a loop form?
|-----rip------R1-------ospf------------R2------eigrp------|
Bob Sinclair
CCIE #10427, CCSI 30427
www.netmasterclass.net
----- Original Message -----
From: John Matus
To: ccielab@groupstudy.com
Sent: Wednesday, November 16, 2005 8:43 PM
Subject: understading multiple points of redistribution
i'm not sure i'm understanding the whole concept of multile points of
redisribution.
i used to think that this was when there was 2 routers on the same subnet
that were redisributing the same routing protocol to 2 other subnets
|-------eigrp-------R1----------rip---------|
| |
| |
|------eigrp--------R2----------rip---------|
but then i found out that this was not the case and that the following
diagram woujld also clasify as multiple points and that a routing loop
could occur here as well.
|-----rip------R1-------ospf------------R2------eigrp------|
so, technically, does "multiple points of redistribution" just mean that
there are at least 2 routers that are redistributing between 2 protocols
(not necessarily the same 2)?
in that case, i've just done IE's lab 1 and 2, and they don't use any
filters when redistributing, but there are multiple points of
redistribution. should there be filters in place?? were the brains' just
hoping there would be no routing loop, or did they know absolutly that
there was no routing loop by looking at the topology?
what should i be looking for in identifying where a routing loop might
occur? i sure thought i knew, but alas this seems not to be the case.
does it make any difference "where and which" protocols are being
redistributed?........
|--------eigrp---------R1--------ospf------------R2-------------eigrp--|
|--------eigrp---------r1----------ospf-----------R2----------------rip---|
do either of these topologies have any more or less chance of having a
routing loop than the other?
TIA!!!
Regards,
John D. Matus
Technical Support / PAS
Fujitsu Consulting
626-568-7716
John.Matus@tokiom.com
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