From: Shibu Nair (shinair@cisco.com)
Date: Sat Jul 03 2004 - 12:36:45 GMT-3
I think you are using VLAN interface as the L3 interface on the switch side.
When you use the vlan interface on the switchside, MTU size is little more
than 1500.
So manual setup the mtu as the same on both sides or "ip ospf mtu-ignore"
interface
command should solve the issue.
Try out
Regards
Shibu
At 06:26 AM 7/3/2004 -0500, barrerj1@hotmail.com wrote:
>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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