From: Bob Sinclair (bsin@cox.net)
Date: Tue Apr 27 2004 - 17:39:34 GMT-3
Andrew,
Mutual redistribution on a router connecting to a single-homed, stub domain
should not require any filters. The IGPs and AD should be able to handle
it. Certainly the KISS principle of redistribution would suggest not adding
filters in this situation.
It is the multi-homed routing domains that require filters (so that routes
that have already been seen by a domain are dropped) and adjustments to AD
(so that native prefixes are routed by the native protocol).
my $.02
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "Edwards, Andrew M" <andrew.m.edwards@boeing.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, April 27, 2004 4:19 PM
Subject: Re: generic redistribution question
> All,
>
> In the lab examples I've done so far I think I'm reading too much into
> redistribution such that I might actually loose points because of "over
> configuration". Looking for some feedback on this...
>
> For example,
>
> Single router is the border router for an OSPF and EIGRP routing domain.
> Requirement is to redistribute OSPF to EIGRP such that all routes are
> visible on all routers.
>
> The approach I generally take and make brain not swirl too much is to
> build route-maps such that I tag redistributed routes from one routing
> domain into another, and then deny those tagged routes on the
> redistribution to the original routing domain.
>
> More specifically,
>
> 1. OSPF to EIGRP with a tag of 222. EIGRP to OSPF deny tag 222.
> 2. EIGRP to OSPF with a tag of 333. OSPF to EIGRP deny tag 333
>
> Makes sense to me, but from an "over configuration" standpoint, would it
> be more correct to just simply redistribute the routes and then let AD
> work on my behalf where applicable?
>
> This all stems from my attempt to build a model for redistribution...
> cause sometimes the redistribution gets a little too much to keep track
> of in my opinion.
>
> Andy
>
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