From: George Goglidze (goglidze@gmail.com)
Date: Tue Jan 29 2008 - 19:21:20 ARST
Hi there Navid,
you can't really say which is the best method for redistribution,
every topology is different.
but anyway first thing you have to look for is
when you redistribute rip->eigrp on one router, not to redistribute same
route eigrp->rip on another router.
which you can fix by setting/checking tag's with route-map's.
now another thing is finding out which routes need to belong to which
protocol,
and when redistributing making sure these routes still belong to correct
protocol.
for example,
R1-----R2 (RIP)
R2-----R3 (OSPF)
R2-----R4 (OSPF)
R3-----R4 (OSPF)
all networks from R1 are announced by rip to R2.
R2 redistributes this route to OSPF and announces this route to R3 and R4.
R3 announces it to R4, R4 announces it back to R2 by OSPF.
and as OSPF has better AD then RIP, better route will be now through R4
which is wrong because the route is through R1.
I hope my example was understandable.
in this situations I would say it's acceptable to do following on R2 ->
"distance ospf external 180"
but what this out, as this may bring you other problems as well.
because OSPF might have some routes that are coming from other place and are
external, but must be OSPF routes.
so you would need to filter that routes and set lower distance on them.
I hope this helps clear it up a bit.
Regards,
On Jan 28, 2008 10:00 PM, Navid Daghighi <smart4D@free.fr> wrote:
> Hi,
>
> I am trying to find out a good strategy for what is usually the last
> question of the IGP section : REDISTRIBUTION.
>
> Some people may be able to find immediatly and exactly and exhaustively
> where we are going to have troubles with loops etc. etc.. and where
> redistribution should be done with tools preventing these loops
> (route-map, distance etc..) : but this is not my case.
>
> So I came up with this "strategy" :
>
> 1/ do redistribution on all required routers and/ or switches
>
> 2/ write tcl scripts and / or macros
>
> 3/ run tcl / macros and see where pings are not functioning and "repair"
>
> 4/ run them on all routers annd switches until it all works without any
> "repairing"
>
> Well, I agree there must be a "shorter" & more efficient way.
>
> If you have a constructive and rigurous way, it would be appreciated !
>
> thanks,
> Navid
>
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