Introduction

Jumbo frames are frames with more than 1500 bytes of payload. You can enable jumbo frame support on the switch to improve throughput and network utilization.
Jumbo frame support allows you to put more data in each packet that the switch has to process.

Usage

Once jumbo frame support is enabled, the maximum received packet size is:

• 9710 bytes for IE200 switches, and AR3050S and AR4050S AR-Series Firewalls.
  On these platforms, we recommend that there are no more than two simultaneously running ports with jumbo frames enabled
• 10240 bytes for SBx908, SBx8100 Series and x900 Series switches
• 12292 bytes for DC2552XS switches
• 16357 bytes for other AlliedWare Plus switches

The command to use to enable jumbo frame support varies between products, but is one of the following:

• mru <mru-size>
• mru jumbo
• platform jumboframe

To see which command your product supports, see the product’s Command Reference on our website at alliedtelesis.com.

Note: Jumbo Frame forwarding is supported only for Layer 2 switching, not for Layer 3 switching. 
Also, keep in mind that enabling the Jumbo frames feature in a switch does not apply to any packets sent to the CPU for additional processing.
Basically, all packets larger than 1500 bytes sent to the CPU will be dropped.