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A question about jumbo frame.

mekand
Occasional Advisor

A question about jumbo frame.

Hi.

I'm looking for infos about jumbo frame and fragmentation when these move within the same vlan.

Two hosts must comunicate each other using jumbo frame but a switch does not support jumbo.

Is there a way to fragment?

Thanks.

Regards.

Andrea

 

2 REPLIES
16again
Respected Contributor

Re: A question about jumbo frame.

afaik, fragmentation is only possible at layer3 , not at layer 2.

The extra processing won't speed up transfers, if devices in the chain have max MTU=1500, just send end points MTU accordingly

Vince-Whirlwind
Honored Contributor

Re: A question about jumbo frame.

There are two types of Jumbo frames:

1. Actual jumbo frames, 6x bigger than normal. The idea is that instead of sending 6 frames, by sending 1 frame, you save on 5 headers. Depending on whether they are dot1q frames or not, this is a total saving of 90-110bytes (out of 9000). On the downside, a bigger frame means a CRC error causes a bigger re-transmit. 

2. Little Jumbo frames, where some kind of additional overhead (eg, VMWare VLAN-tunneling, or encryption) has bumped the frame size a bit higher than the usual maximum.

Either way, if your switch doesn't support Jumbo frames, you can't use them.