From: Hyunseog Ryu (r.hyunseog@ieee.org)
Date: Wed Aug 10 2005 - 18:24:31 GMT-3
Yes, MTU should be matched between two equipments.
OSPF uses media MTU to send as much as info they can.
Otherwise, you can configure "ip ospf mtu-ignore" under interface
configuraiton.
You can check this command from Cisco.com for more info.
It is supported since 12.0(3).
Hyun
Shawn williams wrote:
> I'm working with a Cisco 2501 and a Catalyst 3550.
>
> I configured them both for OSPF area 0. I was not able to form an OSPF
> adjacency between the two devices until I changed the ethernet MTU
> size on the Catalyst 3550 from 1503 to 1500 to match the 2501.
>
> Can someone explain what is happening here? I can pass data between
> the two devices without adjusting the MTU size, but can't form an OSPF
> adjacency. Is MTU size a parameter that must match like hello timers
> or does OSPF use the maximum frame size when forming adjacencies?
>
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