DiffServ incorrectly handles Express Forwarded traffic, with B2 f/w 4.00.26


Userlevel 3
Article ID: 5859

Products
SecureStack B2
Firmware 4.00.26

Protocols/Features
DiffServ

Symptoms
Express Forwarded traffic is not transmitted from high priority hardware queue

Cause
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.

Solution
Upgrade to firmware 4.00.60 or higher.

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