what are the DSCP values why so many?

can you guys help me understand the DSCP values and why do many?what is t doing here?
I believe our Mitel phones are cos or marked 6 on the phone and mls qos cos trusted
on the accesss port so I see it is maping cos-dscp both ingress an egress in the queues but
I don't understand the many Dscp values compared to the cos 5 and co 6?

mls qos srr-queue input cos-map queue 1 threshold 1 5
mls qos srr-queue input cos-map queue 2 threshold 1 6

mls qos srr-queue input dscp-map queue 1 threshold 1 40 41 42 43 44 45 46 47
mls qos srr-queue input dscp-map queue 2 threshold 1 48 49 50 51 52 53 54 55
mls qos srr-queue output cos-map queue 1 threshold 1 6
mls qos srr-queue output cos-map queue 4 threshold 1 5
mls qos srr-queue output dscp-map queue 1 threshold 1 48 49 50 51 52 53 54 55
mls qos srr-queue output dscp-map queue 4 threshold 1 40 41 42 43 44 45 46 47

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Comments

dmcneil330

I'm no QoS wizard by far but it seems to me that it's setting up multiple shaped round robin queues. Basically if the DSCP values of incoming packet are 40 41 42 43 44 45 46 or 47 the go to srr queue with taildrop of 1.

xnx

There's 4 classes of assured forwarding, each one has it's own drop precedence value which dictates how likely something is to be dropped from a flow that uses that class of assured forwarding.

1 value is used for expedited forwarding and another value is for best effort traffic.