From: Gregory Gombas (ggombas@gmail.com)
Date: Mon May 28 2007 - 09:10:40 ART
The AD of a route redistributed into EIGRP is 170 which is worse than
OSPF which is 110.
Did you try raising the OSPF distance to 171 for routes that are
reachable via the EIGRP domain?
On 5/25/07, Ryan Morris <ryan@egate.net> wrote:
> 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
>
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