I-D ACTION:draft-ietf-diffserv-ba-def-00.txt

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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		: Definition of Differentiated Services Behavior 
                          Aggregates and Rules for their Specification
	Author(s)	: K. Nichols, B. Carpenter 
	Filename	: draft-ietf-diffserv-ba-def-00.txt
	Pages		: 15
	Date		: 15-Feb-00
	
The diffserv WG has defined the general architecture for differen-
tiated services (RFC 2475) and has been focused on the definition 
and standardization of the 'per-hop forwarding behaviors' (or 
PHBs) required in routers (RFCs 2474, 2597, and 2598). The dif-
ferentiated services framework creates services within a network 
by applying rules at the edges in the creation of traffic aggregates 
(known as Behavior Aggregates) coupled with the forwarding 
path behavior. The WG has also discussed the behavior required 
at diffserv network edges or boundaries for conditioning the 
aggregates, elements such as policers and shapers [MODEL, 
MIB]. A major feature of diffserv is that only the components 
applying the rules at the edge need to be changed in response to 
short-term changes in QoS goals in the network, rather than 
The next step for the WG is to lay out how the forwarding path 
components (PHBs, classifiers, and traffic conditioners) can be 
used within the architectural framework to compose specific 
Behavior Aggregates. These BAs should have properties such that 
the transit of individual packets of a BA through a differentiated 
services network can be characterized by specific metrics. How-
ever, no microflow information should be required as packets 
transit a differentiated services network. 
This document defines and discusses Behavior Aggregates in 
detail and lays out the format and required content for contribu-
tions to the Diffserv WG on BAs and the rules that will be applied 
for individual BA specifications to advance as WG products. This 
format is specified to expedite working group review of BA sub-
missions.
A pdf version of this document is available at:
ftp://ftp-eng.cisco.com/ftp/kmn-group/docs/ba_def.pdf.

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