02-01-2018 06:14 AM - edited 03-08-2019 01:39 PM
can MTU size mismatch be a reason for not forming adjacencies between two ospf routers ?
02-01-2018 06:26 AM
Yes the MTU must match between routers. Although you can by-pass the check with the following command:
! ip ospf mtu-ignore !
cheers,
Seb.
02-01-2018 06:28 AM
what about in eigrp and Rip ?
02-01-2018 06:27 AM
Yes,
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.0 When this problem occurs, the output of the show ip ospf neighbor command displays output similar that shown below.
document:
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13684-12.html
HTH
02-01-2018 06:29 AM
what about in eigrp and Rip ?
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