Configuration Guidelines for DiffServ Service Classes
RFC 4594
Document | Type | RFC - Informational (August 2006; Errata) | |
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Authors | Fred Baker , Jozef Babiarz , Kwok Chan | ||
Last updated | 2020-01-21 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4594 (Informational) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Allison Mankin | ||
Send notices to | (None) |
Network Working Group J. Babiarz Request for Comments: 4594 K. Chan Category: Informational Nortel Networks F. Baker Cisco Systems August 2006 Configuration Guidelines for DiffServ Service Classes Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document describes service classes configured with Diffserv and recommends how they can be 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 as a policy and for interoperability it is useful to apply them consistently. Babiarz, et al. Informational [Page 1] RFC 4594 Guidelines for DiffServ Service Classes August 2006 Table of Contents 1. Introduction ....................................................3 1.1. Requirements Notation ......................................4 1.2. Expected Use in the Network ................................4 1.3. Service Class Definition ...................................5 1.4. Key Differentiated Services Concepts .......................5 1.4.1. Queuing .............................................6 1.4.1.1. Priority Queuing ...........................6 1.4.1.2. Rate Queuing ...............................6 1.4.2. Active Queue Management .............................7 1.4.3. Traffic Conditioning ................................7 1.4.4. Differentiated Services Code Point (DSCP) ...........8 1.4.5. Per-Hop Behavior (PHB) ..............................8 1.5. Key Service Concepts .......................................8 1.5.1. Default Forwarding (DF) .............................9 1.5.2. Assured Forwarding (AF) .............................9 1.5.3. Expedited Forwarding (EF) ..........................10 1.5.4. Class Selector (CS) ................................10 1.5.5. Admission Control ..................................11 2. Service Differentiation ........................................11 2.1. Service Classes ...........................................12 2.2. Categorization of User Service Classes ....................13 2.3. Service Class Characteristics .............................16 2.4. Deployment Scenarios ......................................21 2.4.1. Example 1 ..........................................21 2.4.2. Example 2 ..........................................23 2.4.3. Example 3 ..........................................25 3. Network Control Traffic ........................................27 3.1. Current Practice in the Internet ..........................27 3.2. Network Control Service Class .............................27 3.3. OAM Service Class .........................................29 4. User Traffic ...................................................30 4.1. Telephony Service Class ...................................31 4.2. Signaling Service Class ...................................33 4.3. Multimedia Conferencing Service Class .....................35 4.4. Real-Time Interactive Service Class .......................37 4.5. Multimedia Streaming Service Class ........................39 4.6. Broadcast Video Service Class .............................41 4.7. Low-Latency Data Service Class ............................43 4.8. High-Throughput Data Service Class ........................45 4.9. Standard Service Class ....................................47 4.10. Low-Priority Data ........................................48 5. Additional Information on Service Class Usage ..................49 5.1. Mapping for Signaling .....................................49 5.2. Mapping for NTP ...........................................50 5.3. VPN Service Mapping .......................................50 6. Security Considerations ........................................51 Babiarz, et al. Informational [Page 2] RFC 4594 Guidelines for DiffServ Service Classes August 2006 7. Acknowledgements ...............................................52Show full document text