The problem that we ran into is on the 2600's with newer revisions
the MTU needs to be set on the 7206 side to match the MTU on the 2610
side. We were replacing the 2500's with 2610's so it's probably almost
the exact same scenario. By default the FR MTU is not set to 1500 which
is what the frame mtu on the 2610's is probably set to. Setting both
sides to 1500 on the FR subints and the 2610 side should work.
OPSF needs matching MTUs on both sides of the link or else it won't
work.
Phil Bedard
On Fri, 04 Aug 2000, Steven Saner wrote:
> Hi:
>
> I am trying to setup some OSPF between a core router (7206) and some
> smaller edge routers. These include some 2500 and 2600 series
> routers. All of the 2500s work fine, but I am having trouble with 5
> out of 6 2600s. Here is a list of the model number and IOS rev on each
>
> 2611 11.3(4)T1 works
>
> 2610 12.0(10) does not work
> 2611 12.0(4)T does not work
> 2611 12.0(3) does not work
> 2611 12.0(4)T does not work
> 2611 12.0(3) does not work
>
> The problem is that as the OSPF is trying to get established between
> the core router and the edge router, one of them gets stuck in the
> EXSTART state and the other in the EXCHANGE state.
>
> Obviously one of the differences between the one that works and the
> others in the working one is an 11.3 version while the others are
> 12.0. Another difference is that the one that works is using a
> point-to-point T1 serial link (HDLC). The ones that do not work are
> all Frame-ATM with < T1 bandwidth. However, some of the 2500s that do
> work are on similar links.
>
> Does anyone know, or have ideas of why this is?
>
> Thanks
>
> --
> ==================================================================
> Steven Saner SouthWind Internet Access, Inc.
> ssaner@southwind.net Systems/Network Administrator
> http://www2.southwind.net/~ssaner http://www.southwind.net
> 263-7963 Wichita (800)525-7963
>
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