Controller Based WLANs

Product and Software: This article applies to ArubaOS Version 6.2.0.2.

A-MSDU consists of multiple 802.3 frames (layer 3-7 payload), remove 802.3 header & trailer, then wrap the multiple MSDU into a single 802.11 frame.

In other words its a Frame aggregation method of combining multiple frames into a single frame transmission. Benefit is fixed MAC layer overhead is reduced, and overhead caused by random back-off timer during medium contention is also minimized.

IMP NOTE

• All MSDUs are intended to a single destination.
• Each MSDU belongs to the same TID (QoS class).
• The entire aggregated frame can be encrypted.
• Only normal acknowledgements are required when using A-MSDU.

Aruba does support Rx A-MSDU, not Tx A-MSDU.