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I-D ACTION:draft-ietf-diffserv-2836bis-01.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Differentiated Services Working Group of the IETF.

	Title		: Per Hop Behavior Identification Codes
	Author(s)	: D. Black, S. Brim, B. Carpenter, F. Le Faucheur
	Filename	: draft-ietf-diffserv-2836bis-01.txt
	Pages		: 8
	Date		: 20-Feb-01
	
Differentiated Services [RFC 2474, RFC 2475] introduces the notion of
Per Hop Behaviors (PHBs) that define how traffic belonging to a
particular behavior aggregate is treated at an individual network
node. In IP packet headers, PHBs are not indicated as such; instead
Differentiated Services Codepoint (DSCP) values are used. There are
only 64 possible DSCP values, but there is no such limit on the
number of PHBs. In a given network domain, there is a locally defined
mapping between DSCP values and PHBs. Standardized PHBs recommend a
DSCP mapping, but network operators may choose alternative mappings.

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