From: Jonathan V Hays (jhays@jtan.com)
Date: Wed Jan 15 2003 - 22:44:20 GMT-3
Chris,
I'm sensing that you are looking for a rigid rule: a guarantee along the
lines of "if there's only one redistribution point you don't need to
worry about route filtering." I don't think anyone can give you such a
guarantee.
To restate what I said in a previous post in this thread, you are better
off examining each situation carefully rather than always applying some
rule (which may not be applicable in special circumstances).
Ideally you should think ahead of time where the problems will be with
mutual redistribution. But I use this crutch, since I am still learning.
Once I have routing working properly, what I like to do *before*
redistribution (as my lab study partner knows ;-) is to take a snapshot
(in notepad) of every routing table. Do this BEFORE doing any
redistribution. This way you can tell at a glance what routes belong
where before redistribution messes everything up.
After redistribute in both directions look at the resulting routing
tables for routes that don't belong comparing them to the
pre-redistributed tables. Some problems may be obvious administrative
distance problems. Use trace to follow the less obvious paths.
And I feel the solution of a complete set of filters every time you do
redistribution may not be appropriate. And in some circumstances it is
completely unnecessary. No one but Cisco knows the intimate details of
how they grade the lab - but it may be possible to lose points for
configuring something that's not required. Again - I'm not sure on this
- just a rumor I've heard. When in doubt, ask the proctor.
HTH,
Jonathan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
chris a
Sent: Friday, October 25, 2002 6:41 AM
To: Jonathan V Hays
Cc: ccielab@groupstudy.com
Subject: Re: Mutual redistribution
Hi,
I have had many thoughts about this and with only 3 weeks to go until my
lab I am start to worry. I have found in Karl Solie's CCIE practical
studies on page 621 he states the following.
R1----------------R2------------------R3-----------------R4
| ----- RIP version 1 ------------------|---EIGRP2001------|
When performing mutual redistribution on R3 becuace there is only one
redistribution point there is no need to perform any route filtering
when using mutual redistribution.
Any thoughts anyone please.
Chris
>
> Hi,
> In case I am doing a mutual redistribution at a single point between
> any two routing protocols , do I really ever need to filter the routes
> that are being redistributed for prevention of a loop.....????????
>
> I have never done this and have had no problems till now..... But
> wouldnt want to discover something new during my lab.....
>
> But is there any case where filtering is required in for such a
> redistribution?....what is the normal thing to do??
>
>
> Regards,
> Vijay.
> .
.
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