Fields that can be marked for QOS purposes - DSCP Setting and Terminology - Assured Forwarding PHB and DSCP values

3 important questions on Fields that can be marked for QOS purposes - DSCP Setting and Terminology - Assured Forwarding PHB and DSCP values

How much classes does AF define and how much levels of drop probility inside the queus?

4 queue/classes with three levels of drop probality

What are the values for AFxy and what value is better?

x implies one of four queus ( values 1 through 4)
y implies one of three drop priorities (values 1 through 3)

X Higher value is better
Y Higher value is worse (higher value means that a packet has higher probability to be dropped)

What is the formula to convert AF name to decimal equivalent?

8X + 2Y = decimal value

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