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Chapter 3
Basic QoS Concepts
E-NIT-CTC-20041213-0013 v0.5
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Marking Once classified, a packet is marked to avoid repeated re-classifications. The marking
is made to the Differentiated Services Code Point (DSCP). The DSCP is trusted by
later routers, so that the high cost of classifying traffic occurs only once.
Shaping At the outgoing network edge, traffic is shaped to meet the traffic contract.
Metering At the outgoing network edge, traffic is metered to meet the traffic profile. This
means that the bandwidth can be limited for certain traffic.
Policing At the incoming network edge traffic is measured and traffic in excess of the traffic
contract is either re-marked to "best effort" or discarded.