"fair-queue" will always work and has some advantages as described by Paresh. WRED or "random-detect" should be used, if the majority of traffic is TCP. Usually this is the case and therefore I would recommend it as well.
Regarding CoS values and queueing for them:
The first question is, whether you have traffic marked with IP precedence/DSCP values other than default. In case you do not have this in your network, there is no need to modify queueing.
In case you need to prioritize some traffic (like VoIP, SAP, Citrix, etc.) compared to other traffic you should use IP precedence or DSCP values to mark it into different classes and adjust queueing according to the values in use.
I do have voip traffic marked with cos=5, dscp=46 queued to priorityQ. The link in question is between two 6509s gig-ports. 6509 has PFC3. Im not sure if fair-queueing/wred is supported by 6509-PFC3 on ethernet gig trunk ports??
We are pleased to announce availability of Beta software for 16.6.3.
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