From: Ryan Morris (ryan@egate.net)
Date: Fri May 25 2007 - 23:36:47 ART
Hi everyone,
This question is based on Scenario 28 in IPExpert Workbook (R5 & R6), if
you're following along.
I have 2 routers that each have a serial interface in the OSPF domain and
a fastethernet interface in the EIGRP domain. They are both performing
mutual redistribution of OSPF and EIGRP. The scenario asks for "optimal"
routing, which to me means that each of these routers should know that
routes being advertised through EIGRP on the FE interface are preferred
over routes redistributed into OSPF and learned via the Serial interface.
I'm using tags to prevent routes from being advertised back into the
originating domain.
The behaviour is this: one of the redistribution routers always learns
the route via OSPF, even though the admin distance of OSPF is worse
than EIGRP.
In the EIGRP topology I see this for the routes I want to learn by EIGRP:
P 10.1.2.0/24, 0 successors, FD is Inaccessible
via 150.50.60.7 (2198016/2195456), FastEthernet0/0
or
P 150.50.8.8/32, 1 successors, FD is 1683456,
via Redistributed (1683456/0)
and if I kill the serial interface it learns it right away via EIGRP, so
it looks like the redistributing router is deciding to prefer OSPF for
some reason.
Is this just an order of operations thing? Sometimes it's one router,
sometimes it's the other. What bothers me is that I can see the routes in
the OSPF database and the EIGRP topology table but the router does not
respect the administrative distance in this case.
Can it be fixed? I thought administrative distance was the answer to
problems like this.
Thanks,
Ryan
This archive was generated by hypermail 2.1.4 : Fri Jun 01 2007 - 06:55:22 ART