Hello Arun,
the best solution is to have the same ip mtu on all devices connected to the same LAN segment.
to be noted that at interface level you can:
increase the generic MTU with
mtu 1546
keep a standard 1500 byte mtu for IP with
ip mtu 1500
add other specific per protocol mtu commands for example for MPLS
mpls mtu 1542
another suggestion is to make the router with different settings DR other on the segment so that its activity is reduced to minimum.
For doing this you can apply
ip ospf priority 0
in interface configuration mode
Hope to help
Giuseppe