CER platform MTU/ Frame size issues

[ChrisL2]

We have never played with MTU/Frame size, all left at Default
which show max-frame-size 1548 port wide.

But i can't seem to ping across a fiber circuit to another CER (P2P) style /30 on each end
with higher than a 1470byte frame with the No-Frag reference to the ping.

How to fix?

Thanks

Chris

[Nick_Fawcett · Accepted solution]

On the MLX and CER execute the global command "default-max-frame-size 9216".  Write mem and reboot.  You have to reboot these units for jumbo frames to be enabled.

~Nick

[ChrisL2]

Does this affect all my other customers traffic?

I have thousands of customers ~ just one is complaining of this issue

Thank you

Sent from Mail for Windows

[Nick_Fawcett]

It will not affect other traffic.

~Nick