Network Working Group F. Le Faucheur, Editor
Request for Comments: 3270 L. Wu
Category: Standards Track B. Davie
Cisco Systems
S. Davari
PMC-Sierra Inc.
P. Vaananen
Nokia
R. Krishnan
Axiowave Networks
P. Cheval
Alcatel
J. Heinanen
Song Networks
May 2002
Multi-Protocol Label Switching (MPLS)
Support of Differentiated Services
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
This document defines a flexible solution for support of
Differentiated Services (Diff-Serv) over Multi-Protocol Label
Switching (MPLS) networks.
This solution allows the MPLS network administrator to select how
Diff-Serv Behavior Aggregates (BAs) are mapped onto Label Switched
Paths (LSPs) so that he/she can best match the Diff-Serv, Traffic
Engineering and protection objectives within his/her particular
network. For instance, this solution allows the network
administrator to decide whether different sets of BAs are to be
mapped onto the same LSP or mapped onto separate LSPs.
Le Faucheur, et. al. Standards Track [Page 1]
RFC 3270 MPLS Support of Differentiated Services May 2002
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Terminology. . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 EXP-Inferred-PSC LSPs (E-LSP) . . . . . . . . . . . . . . . . . 6
1.3 Label-Only-Inferred-PSC LSPs (L-LSP). . . . . . . . . . . . . . 7
1.4 Overall Operations. . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Relationship between Label and FEC. . . . . . . . . . . . . . . 8
1.6 Bandwidth Reservation for E-LSPs and L-LSPs . . . . . . . . . . 8
2. Label Forwarding Model for Diff-Serv LSRs and Tunneling Models . 9
2.1 Label Forwarding Model for Diff-Serv LSRs . . . . . . . . . . . 9
2.2 Incoming PHB Determination. . . . . . . . . . . . . . . . . . .10
2.3 Outgoing PHB Determination With Optional Traffic Conditioning .11
2.4 Label Forwarding. . . . . . . . . . . . . . . . . . . . . . . .11
2.5 Encoding Diff-Serv Information Into Encapsulation Layer . . . .13
2.6 Diff-Serv Tunneling Models over MPLS. . . . . . . . . . . . . .13
3. Detailed Operations of E-LSPs. . . . . . . . . . . . . . . . . .22
3.1 E-LSP Definition. . . . . . . . . . . . . . . . . . . . . . . .22
3.2 Populating the `Encaps-->PHB mapping' for an incoming E-LSP . .23
3.3 Incoming PHB Determination On Incoming E-LSP. . . . . . . . . .23
3.4 Populating the `Set of PHB-->Encaps mappings' for an outgoing
E-LSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
3.5 Encoding Diff-Serv information into Encapsulation Layer On
Outgoing E-LSP. . . . . . . . . . . . . . . . . . . . . . . . .26
3.6 E-LSP Merging . . . . . . . . . . . . . . . . . . . . . . . . .27
4. Detailed Operation of L-LSPs. . . . . . . . . . . . . . . . . .28
4.1 L-LSP Definition. . . . . . . . . . . . . . . . . . . . . . . .28
4.2 Populating the `Encaps-->PHB mapping' for an incoming L-LSP . .28
4.3 Incoming PHB Determination On Incoming L-LSP. . . . . . . . . .30
4.4 Populating the `Set of PHB-->Encaps mappings' for an outgoing
L-LSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
4.5 Encoding Diff-Serv Information into Encapsulation Layer on
Outgoing L-LSP. . . . . . . . . . . . . . . . . . . . . . . . .33
4.6 L-LSP Merging . . . . . . . . . . . . . . . . . . . . . . . . .34
5. RSVP Extension for Diff-Serv Support . . . . . . . . . . . . . .34
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