Layer 2 QoS

I have a quick questions on layer 2 QoS that I cannot find an answer to. In
all of cisco's doc and QoS design guides they map higher COS traffic (or DSCP
traffic) to higher thresholds within the queues like below.

mls qos srr-queue output cos-map queue 2 threshold 1 2
mls qos srr-queue output cos-map queue 2 threshold 2 3
mls qos srr-queue output cos-map queue 2 threshold 3 6 7

My understanding of thresholds is the higher the threshold breached the more
likely packets get dropped. The way Cisco says do to this mapping seem
opposite to me. I would think you would want the more critical traffic in the
lower threshold...not the higher. I know COS 5 goes to the priority queue so
I'm just looking at the non-priority queues.

Thanks,
Andy

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Received on Sun Feb 27 2011 - 14:23:36 ART