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by a classifier, which steers the packets to a logical instance of a traffic conditioner A meter is used (where appropriate) to measure the traffic stream against a traffic profile The state of the meter with respect to a particular packet (whether it is in or out of profile) may be used to affect a marking, dropping, or shaping action When packets exit the traffic conditioner of a DS boundary node, the DSCP of each packet must be set to an appropriate value Refer to Figure 3-19, which shows a block diagram of a classifier and traffic conditioner Note that a traffic conditioner may not necessarily contain all four elements For example, in the case where no traffic profile is in effect, packets may only pass through a classifier and a marker
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Meters Traffic meters measure the temporal properties of the stream of
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packets selected by a classifier against a traffic profile specified in a TCA A meter passes state information to other conditioning functions to trigger a particular action for each packet that is either in or out of profile (to some extent)
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Markers Packet markers set the DS field of a packet to a particular code
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point, adding the marked packet to a particular DS BA The marker may be configured to mark all packets that are steered to it to a single code point or may be configured to mark a packet to one of a set of code points used to select a PHB in a PHB group, according to the state of a meter When the marker changes the code point in a packet, it is said to have remarked the packet
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Shapers Shapers delay some or all of the packets in a traffic stream in
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order to bring the stream into compliance with a traffic profile A shaper usually has a finite-size buffer, and packets may be discarded if there is not sufficient buffer space to hold the delayed packets
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Droppers Droppers discard some or all of the packets in a traffic stream in order to bring the stream into compliance with a traffic profile This process is known as policing the stream Note that a dropper can be implemented as a special case of a shaper by setting the shaper buffer size to zero (or a few) packets
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Location of Traffic Conditioners and MF Classifiers Traffic conditioners are usually located within DS ingress and egress boundary nodes, but may also be located in nodes within the interior of a DS domain or within a non-DS-capable domain See Figure 3-22
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Within the Source Domain We define the source domain as the domain con-
taining the node(s) that originates the traffic receiving a particular service
Quality of Service (QoS)
DS Interior BA Classifier PHB Support Queue Mngt/Sched DS Boundary BA Classifier Metering Marking Traffic Conditioning
Figure 3-22 DS domains and other elements
DS Boundary MF Classifier Metering Marking Traffic Conditioning
Microflows BA Traffic
DS Domain
DS Domain
DS domain DS egress node DS ingress node DS interior node DS node DS region DS boundary node
A DS-capable domain; a contiguous set of nodes which operate with a common set of service provisioning policies and PHB definitions A DS boundary node in its role in handling traffic as it leaves a DS domain A DS boundary node in its role in handling traffic as it enters a DS domain A DS node that is not a DS boundary node A DS-compliant node A set of contiguous DS domains which can offer differentiated services over paths across those DS domains A DS node that connects one DS domain to a node either in another DS domain or in a domain that is not DS-capable
Behavior Aggregate (BA) BA classifier Microflow MF Classifier
A DS behavior aggregate A classifier that selects packets based only on the contents of the DS field A single instance of an application-to-application flow of packets which is identified by source address, source port, destination address, destination port, and protocol id A multi-field (MF) classifier which selects packets based on the content of some arbitrary number of header fields; typically some combination of source address, destination address, DS field, protocol ID, souce port, and destination port
Per-Hop-Behavior (PHB)
The externally observable forwarding behavior applied at a DS-compliant node to a DS behavior aggregate
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