Hi All,
We have a Cisco 9407 and a Juniper MX480 in an OSPF peering on our prod network. The C9407 has a system MTU of 9192, meaning all of its interface are set with 9192 MTU while the J-MX480 has been configured with a 9014 MTU specifically on the interface facing the C9407. This was the working configuration for almost 2 years until the OSPF neighborship went down. We resolved the issue by adding 'ip mtu 1500' and 'ip ospf mtu-ignore' commands on the C9407. Cisco TAC said it is an MTU mismatch but what we wanted to know was what triggered the sudden tearing of the OSPF neighborship that worked for almost 2 years. We cannot replicate the issue anymore. Anyone experienced something like this?
TIA
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