From: barrerj1@hotmail.com
Date: Sat Jul 03 2004 - 08:26:16 GMT-3
Hi all!
While doing an OSPF practice lab, I was encountered by the following
problem.
2 routers connected to a 3550 and running OSPF between them, the state
was stuck in EXSTART and couldn't complete the adjacency.
I checked CCO and found that the problem was an MTU mismatched.
However, the CCO doc points this problem to be a common when you connect
to another vendor's router. In my case all devices are CISCO.
Neighbors Stuck in Exstart/Exchange State
The problem occurs most frequently when attempting to run OSPF between a
Cisco router and another vendor's router. The problem occurs when the
maximum transmission unit (MTU) settings for neighboring router
interfaces don't match. If the router with the higher MTU sends a packet
larger that the MTU set on the neighboring router, the neighboring
router ignores the packet.
http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a
0080093f0d.shtml
Can any one explain why this behavior as I did not change any of the MTU
configurations before the problem occurred?
Thanks
JB
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