From: Dr. Seuss (greeneggsandham4@hotmail.com)
Date: Sat Jan 10 2009 - 14:35:13 ARST
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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