I-D ACTION:draft-ietf-diffserv-headers-00.txt

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	Title           : Definition of the Differentiated Services
			  Field (DS Byte) in the IPv4 and IPv6 Headers
	Author(s)	: K. Nichols, S. Blake
	Filename	: draft-ietf-diffserv-headers-00.txt
	Pages		: 11
	Date		: 07-May-98
	
Differentiated services are intended to provide scalable service
   discrimination in the Internet without the need for per-flow state
   and signaling at every hop.  A variety of services may be built from
   a small, well-defined set of building blocks which are deployed in
   network nodes.  The services may be either end-to-end or intra-
   domain. Services can be provided by a combination of:
 
   - setting bits in an IP header field at network edges and
     administrative boundaries,
   - using those bits to determine how packets are forwarded by the
     routers inside the network, and
   - conditioning the marked packets at network boundaries in accordance
     with the requirements or rules of each service.
 
   This document defines the IP header field, called the DS (for
   differentiated services) byte. In IPv4, it takes the place of the TOS
   octet; in IPv6, it takes the place of the Traffic Class octet.  A
   differentiated services-capable network node includes a classifier
   that selects packets based on the value of the DS byte and is capable
   of delivering the specific packet forwarding treatment corresponding
   to that value.  This document defines two packet forwarding
   treatments, or per-hop behaviors.  Setting of the DS byte and other
   conditioning of the dynamic behavior of marked packets need only be
   performed at network boundaries and may vary in complexity.
 
   For a more complete understanding of differentiated services, this
   document should be read along with its companion documents, the
   differentiated services architecture [ARCH], the differentiated
   services framework [FWK], and other documents which specify
   additional per-hop behaviors, such as [Baker].

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