From: Thomas Larus (tlarus@cox.net)
Date: Fri Oct 03 2003 - 17:34:47 GMT-3
Okay, I am going out on a limb here, but I believe that, if all else in the
whole scenario is configured just right, there should no need for filtering
at the sole point of redistribution. This is because of the loop prevention
behavior that has been discussed often here, that a router will not
redistribute routes from one routing protocol to another that were just
redistributed into the first routing protocol on the same router. (Often
discussed in regard to connected routes). This is why you need to
redistribute routes separately from each protocol into each other protocol
on a router where you have three protocols running and want lots of wild and
crazy redistribution.
You sometimes see filters in single-point route redistribution examples
because things are not always configured just right. For example, I believe
that if you had a RIP domain in which split horizon was disabled somewhere,
the split horizon problem could cause serious problems that might look like
a "route feedback" problem.
Tom Larus
---- Original Message -----
From: "Peng Zheng" <zpnist@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Friday, October 03, 2003 3:24 PM
Subject: redistribute between IGPs
> Is there any scenario that routing filter is necessary
> with one point redistribution between any two of IGPs?
>
> Thanks.
>
>
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