PCE-Based Computation Procedure to Compute Shortest Constrained Point-to-Multipoint (P2MP) Inter-Domain Traffic Engineering Label Switched Paths
RFC 7334
Internet Engineering Task Force (IETF) Q. Zhao
Request for Comments: 7334 D. Dhody
Category: Experimental Huawei Technology
ISSN: 2070-1721 D. King
Old Dog Consulting
Z. Ali
Cisco Systems
R. Casellas
CTTC
August 2014
PCE-Based Computation Procedure to Compute
Shortest Constrained Point-to-Multipoint (P2MP) Inter-Domain
Traffic Engineering Label Switched Paths
Abstract
The ability to compute paths for constrained point-to-multipoint
(P2MP) Traffic Engineering Label Switched Paths (TE LSPs) across
multiple domains has been identified as a key requirement for the
deployment of P2MP services in MPLS- and GMPLS-controlled networks.
The Path Computation Element (PCE) has been recognized as an
appropriate technology for the determination of inter-domain paths of
P2MP TE LSPs.
This document describes an experiment to provide procedures and
extensions to the PCE Communication Protocol (PCEP) for the
computation of inter-domain paths for P2MP TE LSPs.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This document is a product of the Internet Engineering
Task Force (IETF). It represents the consensus of the IETF
community. It has received public review and has been approved for
publication by the Internet Engineering Steering Group (IESG). Not
all documents approved by the IESG are a candidate for any level of
Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7334.
Zhao, et al. Experimental [Page 1]
RFC 7334 PCEP P2MP Inter-Domain Procedures August 2014
Copyright Notice
Copyright (c) 2014 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
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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 Simplified BSD License.
Zhao, et al. Experimental [Page 2]
RFC 7334 PCEP P2MP Inter-Domain Procedures August 2014
Table of Contents
1. Introduction ....................................................4
1.1. Scope ......................................................4
1.2. Requirements Language ......................................4
2. Terminology .....................................................5
3. Examination of Existing Mechanisms ..............................6
4. Assumptions .....................................................7
5. Requirements ....................................................8
6. Objective Functions and Constraints .............................9
7. P2MP Path Computation Procedures ...............................10
7.1. General ...................................................10
7.2. Core-Trees ................................................10
7.3. Optimal Core-Tree Computation Procedure ...................13
7.4. Sub-tree Computation Procedures ...........................15
7.5. PCEP Protocol Extensions ..................................15
7.5.1. Extension of RP Object .............................15
7.5.2. Domain and PCE Sequence ............................16
7.6. Using H-PCE for Scalability ...............................16
7.7. Parallelism ...............................................17
8. Protection .....................................................17
8.1. End-to-End Protection .....................................17
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