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OSPF point-to-point configuration fails

michael.fowler
Level 1
Level 1

‎02-17-2006 12:37 PM - edited ‎03-03-2019 11:47 AM

OSPF point-to-point configuration fails exstart phase with a 'interface mtu is too large'. Likely to be a configuration problem I'm sure but not sure how to remedy it. This is setup on two 3600 routers connecting to a 7204 thru a frame-relay switch. Anybody familiar with OSPF and this MTU problem?

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pkhatri
Level 11
Level 11

‎02-17-2006 01:07 PM

Hi,

For an OSPF adjacency to be formed, the IP MTU at each end has to be identical. Please use 'show interface' to verify that the MTU is the same at both ends. If not, you will need to configure the mtu using 'ip mtu'.

The alternative is to use the command 'ip ospf mtu-ignore' in interface-configuration mode but I would recommend that you use the first fix I mentioned above since a mismatched MTU will case you other issues.

Hope that helps - pls rate the post if it does.

Paresh

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