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rfc3270 - Network Working Group F Le Faucheur Editor...

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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]
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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 5.1 Diff-Serv related RSVP Messages Format. . . . . . . . . . . . .34 5.2 DIFFSERV Object . . . . . . . . . . . . . . . . . . . . . . . .35 5.3 Handling DIFFSERV Object. . . . . . . . . . . . . . . . . . . .37 5.4 Non-support of the DIFFSERV Object. . . . . . . . . . . . . . .40 5.5 Error Codes For Diff-Serv . . . . . . . . . . . . . . . . . . .40 5.6 Intserv Service Type. . . . . . . . . . . . . . . . . . . . . .41 6. LDP Extensions for Diff-Serv Support . . . . . . . . . . . . . .41 6.1 Diff-Serv TLV . . . . . . . . . . . . . . . . . . . . . . . . .42 6.2 Diff-Serv Status Code Values. . . . . . . . . . . . . . . . . .44 6.3 Diff-Serv Related LDP Messages. . . . . . . . . . . . . . . . .44 6.4 Handling of the Diff-Serv TLV . . . . . . . . . . . . . . . . .46
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