From: Bernard Dunn (dunn@xxxxxxxxx)
Date: Tue Dec 26 2000 - 17:52:00 GMT-3
Kevin,
Since you've found the problem to be mtu mismatch, check both routers, and
you'll probably find one router's default is not 4464 for token ring. It
is an interface driver issue that it is not.
We have a couple of IOS versions where the default token ring mtu has been
set differently.
Regards
Bernard.
On Tue, 26 Dec 2000, Kevin Baumgartner wrote:
>
> So I was trying to do isis over tokenring between two routers.
> It was never able to form isis neighbors with the other router. If I
> did "debug isis adj" it showed that the routers was trying to negotiate the
> length (mtu). Started at 4469
>
> 20:02:19: ISIS-Adj: Sending L2 LAN IIH on TokenRing1/0, length 4469
>
> and the other router would do the same. But neither router would receive
> any ISIS-Adj.
>
> So I was able to find a isis configuration with Tokenring and the mtu was
> defined to 1500 on the tokenring interfaces. So I put this on both of my
> routers tokenring interfaces and they formed a isis adj and isis neighbors.
>
> So this seems to be a isis with tokenring issue. Might be something to
> watch for. I am still not quite sure why this is required but then again I
> still
> don't understand isis that well.
>
> Kevin
>
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