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OSPF

jonk34567
Level 4
Level 4

can MTU size mismatch be a reason for not forming adjacencies between two ospf routers ?

4 Replies 4

Seb Rupik
VIP Alumni
VIP Alumni

Yes the MTU must match between routers. Although you can by-pass the check with the following command:

!
ip ospf mtu-ignore
!

cheers,

Seb.

what about in eigrp and Rip ? 

Reza Sharifi
Hall of Fame
Hall of Fame

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

what about in eigrp and Rip ? 

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