Applicability of the Path Computation Element (PCE) to Point-to-Multipoint (P2MP) MPLS and GMPLS Traffic Engineering (TE)
RFC 5671
Document | Type | RFC - Informational (October 2009; No errata) | |
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Authors | Adrian Farrel , Seisho Yasukawa | ||
Last updated | 2018-12-20 | ||
Replaces | draft-yasukawa-pce-p2mp-app | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5671 (Informational) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ross Callon | ||
Send notices to | (None) |
Network Working Group S. Yasukawa Request for Comments: 5671 NTT Category: Informational A. Farrel, Ed. Old Dog Consulting October 2009 Applicability of the Path Computation Element (PCE) to Point-to-Multipoint (P2MP) MPLS and GMPLS Traffic Engineering (TE) Abstract The Path Computation Element (PCE) provides path computation functions in support of traffic engineering in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. Extensions to the MPLS and GMPLS signaling and routing protocols have been made in support of point-to-multipoint (P2MP) Traffic Engineered (TE) Label Switched Paths (LSPs). This document examines the applicability of PCE to path computation for P2MP TE LSPs in MPLS and GMPLS networks. It describes the motivation for using a PCE to compute these paths and examines which of the PCE architectural models are appropriate. 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) 2009 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the BSD License. Yasukawa & Farrel Informational [Page 1] RFC 5671 PCE for P2MP MPLS and GMPLS TE October 2009 Table of Contents 1. Introduction ....................................................2 2. Architectural Considerations ....................................4 2.1. Offline Computation ........................................4 2.2. Online Computation .........................................4 2.2.1. LSR Loading .........................................5 2.2.2. PCE Overload ........................................6 2.2.3. PCE Capabilities ....................................6 3. Fragmenting the P2MP Tree .......................................7 4. Central Replication Points ......................................8 5. Reoptimization and Modification .................................9 6. Repair .........................................................10 7. Disjoint Paths .................................................11 8. Manageability Considerations ...................................11 8.1. Control of Function and Policy ............................11 8.2. Information and Data Models ...............................11 8.3. Liveness Detection and Monitoring .........................12 8.4. Verifying Correct Operation ...............................12 8.5. Requirements on Other Protocols and Functional Components ................................................12 8.6. Impact on Network Operation ...............................13 9. Security Considerations ........................................13 10. Acknowledgments ...............................................13 11. References ....................................................13 11.1. Normative References .....................................13 11.2. Informative References ...................................13 1. Introduction The Path Computation Element (PCE) defined in [RFC4655] is an entity that is capable of computing a network path or route based on a network graph and of applying computational constraints. The intention is that the PCE is used to compute the path of Traffic Engineered Label Switched Paths (TE LSPs) within Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. [RFC4655] defines various deployment models that place PCEs differently within the network. The PCEs may be collocated with the Label Switching Routers (LSRs), may be part of the management system that requests the LSPs to be established, or may be positioned as one or more computation servers within the network. Requirements for point-to-multipoint (P2MP) MPLS TE LSPs are documented in [RFC4461], and signaling protocol extensions for setting up P2MP MPLS TE LSPs are defined in [RFC4875]. In this Yasukawa & Farrel Informational [Page 2]Show full document text