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Identify packets for subsequent forwarding treatment performed in routers or hosts combined with other actions Based on: one or more fields in packet header payload contents input interface
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Figure 3-19 Other key concepts
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A device that performs metering; metering is the process of measuring the temporal properties (eg, rate) of a traffic stream selected by a classifier The instantaneous state of this process may be used to affect the operation of a marker, shaper, or droper, and/or may be used for accounting and measurement purposes
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Policing checks conformance to a configured (or signaled) traffic (meter) profile Leaky Bucket or Token Bucket
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R (token/sec)
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Classifier
Marker
Operation Conformant traffic is injected into the network Nonconformant traffic may be marked delayed or discarded Perfomed at network ingress or logical policing points Shaping removes jitter at the expense of some latency Packets (flow)
B (tokens)
tokens
Shaping Queue
An entity which selects packets based on the content of packet headers according to defined rules A device that performs markings; marking is the process of setting the DS codepoint in a packet based on defined rules; premarking, remarking
Outgoing Packets
A device that performs shaping; shaping is the process of delaying packets within a traffic stream to cause it to conform to some defined traffic profile
Figure 3-20 diffserv router functions Source: Cisco Systems
Edge Router DiffServ Functions meter Shaper dropper Core Edge Classifier - MF or BA Meter - measures traffic against profile Packet marker - marks DSCPs Shaper/dropper - traffic conditioners Core
classifier
marker
Edge Classifier - BA only PHB - supported by queue mngt/sched techniques
Interior Router DiffServ Functions classifier PHB (queues)
Quality of Service (QoS)
0 1 2 3 4 5 6 7 + + + + + + + + + DSCP CU(*)
Figure 3-21 DSCP
+ + + + + + + + + Differentiated Services Codepoint (DSCP) (RFC 2474) used to select the service (PHB) the packet will receive at each DS-capable node formerly the IPv4 TOS and IPv6 traffic class fields
(*) CU: Currently undefined
achieves scalability by implementing complex classification and conditioning functions only at network boundary nodes, and by applying PHBs to aggregates of traffic that have been appropriately marked using the DS field in the IPv4 or IPv6 headers29 See Figure 3-21 PHBs are defined to permit a reasonably granular means of allocating buffer and bandwidth resources at each node among competing traffic streams Per-application flow or per-customer forwarding state need not be maintained within the core of the network A distinction is maintained among
I I I I
The service provided to a traffic aggregate The conditioning functions and PHBs used to realize services The DS field value (DSCP) used to mark packets to select a PHB The particular node implementation mechanisms that realize a PHB
Service-provisioning and traffic-conditioning policies are sufficiently decoupled from the forwarding behaviors within the network interior to permit implementation of a wide variety of service behaviors, with room for future expansion This architecture only provides service differentiation in one direction of traffic flow and is therefore asymmetric The following requirements are identified and addressed in the RFC 2475 architecture:
I I I
Should accommodate a wide variety of services and provisioning policies, extending end to end or within a particular (set of) network(s) Should allow decoupling of the service from the particular application in use Should work with existing applications without the need for API changes or host software modifications (assuming the suitable
3
deployment of classifiers, markers, and other traffic-conditioning functions)
I I I
Should decouple traffic-conditioning and service-provisioning functions from forwarding behaviors implemented within the core network nodes Should not depend on hop-by-hop application signaling Should require only a small set of forwarding behaviors whose implementation complexity does not dominate the cost of a network device and that will not introduce bottlenecks for future high-speed system implementations Should avoid per-microflow or per-customer state within core network nodes Should utilize only aggregated classification state within the network core Should permit simple packet classification implementations in core network nodes (BA classifier) Should permit reasonable interoperability with non-DS-compliant network nodes Should accommodate incremental deployment
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