ACI OSPF neigbor stuck in Exchange/DR

[NInja Black]

Configuring OSPF neighborship between ACI and Catalyst 4507 switch but the neighbors are stuck in Exchange/DR.
 
The MTU on ACI is 9000 by default and on Cat4k is 1500. I did configure 'mtu-ignore' on both sides and still unable to bring the neighbor up. Will I have to hard code the MTU on ACI L3Out interface to make this work?
 
 

[paul driver]

Hello
Is it an mtu mismatch causing this issue?

Can you ping the neighbour with increasing mtu sizes?,
What does the debug state?
Debug ip ospf adj

[balaji.bandi]

if you already configured MTU ignor still having issue.

Steps :

1. shutdown both the side interface and bring up see if that work

2. if not enable debug one of the side and check what is the errors ? below guide help you.

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13684-12.html

[NInja Black · Accepted solution]

removed the ' ip ospf mtu-ignore' on both sides and hardcoded the mtu size on Cat4k switch interface to 9000 and the neighbor state changed to Full

The mtu-ignore probably didn't work due to some bug.