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Glossary
meter
meter A device that measures the rate of a traffic stream selected by a classifier. The instantaneous state of this process can be used to affect the operation of a marker, shaper, or policer.
per hop behavior (PHB) The externally observable forwarding treatment applied at
a
policer A device that as part of shaping discards (drops) packets within a traffic stream, in accordance with the state of a corresponding meter enforcing a traffic profile.
policy block In the context of an
Quality of Service (QoS) A set of service requirements to be met by the network while transporting a flow. Implies a mechanism to deliver better than
service level agreement (SLA) A service contract between a customer and a service provider that specifies the forwarding service the customer is to receive. It can include traffic conditioning rules.
service provisioning policy A policy that defines how traffic conditioners are configured on DS boundary nodes, and how traffic streams are mapped to DS behavior aggregates to achieve a range of services.
shaper A device that delays packets within a traffic stream to cause it to conform to some defined traffic profile, usually to reduce load peaks.
traffic classification The process where packets in a traffic stream are filtered into distinct classes (groups) based on the content of a part of the packet header.
traffic conditioning The process where packets in a traffic stream are subject to control functions including metering, marking, policing and shaping.
traffic shaper See shaper.
traffic profile A description of the temporal properties of a traffic stream. For example, rate and burst size.
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