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URL:
http://www.ietf.org/rfc/rfc3260.txt
Differentiated services (DiffServ) [RFC 3260] include
enhancements to IP to enable scalable service discrimination. IP packets are
classified and marked to receive a particular per-hop forwarding behavior on
nodes along their path using the field [DSFIELD]. Network resources are
allocated to traffic streams by service provisioning policies which govern how
traffic is marked and conditioned upon entry to a differentiated
services-capable network, and how that traffic is forwarded within that
network.
Keywords:
Internet, Integrated Service, QoS, Scalability
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