From: Pavel Bykov (slidersv@gmail.com)
Date: Sat Jan 10 2009 - 17:48:14 ARST
What IOS are you running? I remember a bug i old (really old) ioses that did
that.
Normally IOS has loop prevention mechanism for this case that works for
simple topologies.
On Sat, Jan 10, 2009 at 5:35 PM, Dr. Seuss <greeneggsandham4@hotmail.com>wrote:
> Odd scenario, I realize, but here's what's going on: My RIP routes
> (3.x.x.x
> and 8.x.x.x) are being redistributed at the border router into ISIS. A
> neighbor ISIS router is receiving these routes and installing them into its
> routing table. However, it's then re-advertising them back to the border
> router - a classic routing loop. The border router, seeing these routes
> coming from ISIS (admin dist. 115) versus RIP (admin dist 120) is then
> forwarding traffic to the neighbor ISIS router rather than to the proper
> external RIP routers.
>
> I'm noticing that I cannot set up an outbound distribute list on either the
> border router or the interior ISIS router. Am I missing something here, or
> can ISIS updates not be filtered? My solution was to establish a static
> route
> on the border router pointing to the external RIP routers, and then
> redistributing the static routes into ISIS. But this just seems kludgey to
> me, since that still doesn't prevent the ISIS neighbor from re-advertising
> the
> routes to the border router.
>
> Thanks,
>
> BJW
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