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Posted by Hansang Bae on December 19, 2004, 4:22 am
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On Fri, 17 Dec 2004 22:41:19 -0800, "Andrey Tarasov"
>Hello, All!
>
>I found some strange thing and wonder if somebody seen it before. I have a Cisco
>2651 router with 12.2(24) IOS running EIGRP. There is GRE tunnel to remote site.
>Everything is working except from the fact that EIGRP updates gets fragmented by
>GRE. Changing "ip mtu" doesn't do any difference except the case when "ip mtu"
>set to 1500, than it's GRE packet which gets fragmented. I'm not sure if EIGRP
>tracks "ip mtu" and just miscalculate packet size or ignores it altogether.
>
>I have a case opened with Cisco but all I've got so far is two statements -
>EIGRP pays attention to MTU and EIGRP doesn't do that.
>
I haven't seen this yet but I guess we might run into it as we are
moving to 12.2.24a for quite a few of the branch routers (but OSPF for
that particular branch network)
You may even have bigger issues in that it could be a switching path
problem. Your EIGRP packets are process switched and not cef/fast
switched. So things that work when you fast/cef switch may not work
when you process switch and vice versa.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
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