Hi Nayab,
That's all what you need. You can add it to the RC file to make it permanent.
But, keep in mind, you have to configure it also on the switches and vlan's you're on, and also on the sending parts.
So, also the servers need to be configured with jumbo frames to get the benefits of it.
Other point, some switches need to be set to a higher MTU size to support it(exampe MTU of 9148)
Arco