From: Matt Mullen (mullenm@gmail.com)
Date: Mon Apr 11 2005 - 20:50:11 GMT-3
Hello group,
I was working a lab scenario this past weekend where there were two
routers, R6 and R5 both trying to form an OSPF adjacency to a 3550
switch via a SVI (VLAN interface). The adjacencies were not coming
up, and a 'debug ip ospf adj' showed me that there was an MTU
mismatch between the routers and the 3550 switch. The switch had an
MTU of 1504 while the routers had an MTU of 1500. To correct the
problem, I set the MTU on the 3550 switch SVI to 1500.
Today going back and checking my work against the solutions, the
solutions show 'ip ospf mtu-ignore' being configured on the routers
and on the SVI. So, this leads me to a couple of questions:
1) Why was the MTU of the switch appearing as 1504? Is it possible
that the switch automatically bumped the system mtu up to 1504 because
I had previously configured 802.1Q tunneling? I thought you had to
manually set the 'system mtu 1504' for this to happen, which I didn't
do.
2) Is there anything wrong with the solution I used to solve the
problem? i.e. Would I get the points?
TIA,
Matt
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