Article ID: 5859
Express Forwarded traffic is not transmitted from high priority hardware queue
If DiffServ is used to mark the DSCP value of a frame based on a keyword of "ef" or a value of 46 (with either of these yielding L3 Express Forwarding), as a side-function the outgoing L2 frame should be placed into the highest priority hardware queue (Queue 5) for transmission (5848
This side-functionality is broken, with the above-stated product and firmware.
Upgrade to firmware 4.00.60 or higher.