Network WG James Polk, ed.
Internet-Draft Cisco
Intended status: Standards Track (PS) Feb, 2013
Obsoletes: RFC 4594
Updates: RFC 5865
Expires: August 25, 2013
Standard Configuration of DiffServ Service Classes
draft-polk-tsvwg-rfc4594-update-03.txt
Abstract
This document describes service classes configured with DiffServ and
identifies how they are used and how to construct them using
Differentiated Services Code Points (DSCPs), traffic conditioners,
Per-Hop Behaviors (PHBs), and Active Queue Management (AQM)
mechanisms. There is no intrinsic requirement that particular
DSCPs, traffic conditioners, PHBs, and AQM be used for a certain
service class, but for consistent behavior under the same network
conditions, configuring networks as described here is appropriate.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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reference material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 25, 2013.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
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document must include Simplified BSD License text as described in
Polk Expires August 25, 2013 [Page 1]
Internet-Draft Std Config. for DiffServ Service Classes Feb 2013
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Table of Contents
1. Introduction ...................................................3
1.1. Requirements Notation .....................................
1.2. Expected Use in the Network ...............................
1.3. Service Class Definition ..................................
1.4. Key Differentiated Services Concepts ......................
1.4.1. Queuing ..............................................
1.4.1.1. Priority Queuing ............................
1.4.1.2. Rate Queuing ................................
1.4.2. Active Queue Management ..............................
1.4.3. Traffic Conditioning .................................
1.4.4. Differentiated Services Code Point (DSCP) ............
1.4.5. Per-Hop Behavior (PHB) ...............................
1.5. Key Service Concepts ......................................
1.5.1. Default Forwarding (DF) ..............................
1.5.2. Assured Forwarding (AF) ..............................
1.5.3. Expedited Forwarding (EF) ...........................1
1.5.4. Class Selector (CS) .................................1
1.5.5. Admission Control ...................................1
1.6 What Changes are Proposed Here from RFC 4594?..............1
2. Service Differentiation .......................................1
2.1. Service Classes ..........................................1
2.2. Categorization of User Oriented Service Classes ..........1
2.3. Service Class Characteristics ............................1
2.4. Service Classes vs. Treatment Aggregate (from RFC 5127)...2
2.4.1 Examples of Service Classes in Treatment Aggregates...2
3. Network Control Traffic .......................................2
3.1. Current Practice in the Internet .........................2
3.2. Network Control Service Class ............................2
3.3. OAM Service Class ........................................2
4. User Oriented Traffic .........................................3
4.1. Conversational Service Class Group .......................3
4.1.1 Audio Service Class ..................................3
4.1.2 Video Service Class ..................................3
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