HP-UX IPQoS A.01.00 Administrator's Guide (October 2005)

Glossary
meter
Glossary132
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 DS-compliant node to a collection of
packets with the same DSCP.
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 HP-UX
IPQoS configuration file, defines a specific
policy to apply to traffic which matches any
filters associated with the policy.
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 best-effort service to
network traffic.
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.