PCE Working Group H. Chen
Internet-Draft D. Dhody
Intended status: Informational Huawei Technologies
Expires: November 1, 2013 April 30, 2013
The Applicability of the PCE to Computing Protection and Recovery Paths
for Single Domain and Multi-Domain Networks.
draft-chen-pce-protection-applicability-03
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.
A link or node failure can significantly impact network services in
large-scale networks. Therefore it is important to ensure the
survivability of large scale networks which consist of various
connections provided over multiple interconnected networks with
varying technologies.
This document examines the applicability of the PCE architecture,
protocols, and procedures for computing protection paths and
restoration services, for single and multi-domain networks.
This document also explains the mechanism of Fast Re-Route (FRR)
where a point of local repair (PLR) needs to find the appropriate
merge point (MP) to do bypass path computation using PCE.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
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This Internet-Draft will expire on November 1, 2013.
Copyright Notice
Chen & Dhody Expires November 1, 2013 [Page 1]
Internet-Draft Applicability of PCE to Protection April 2013
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Internet-Draft Applicability of PCE to Protection April 2013
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Domains . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1.1. Inter-domain LSPs . . . . . . . . . . . . . . . . . . 5
1.2. Recovery . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3. Requirements Language . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Path Computation Element Architecture Considerations . . . . . 7
3.1. Online Path Computation . . . . . . . . . . . . . . . . . 7
3.2. Offline Path Computation . . . . . . . . . . . . . . . . . 7
4. Protection Service Traffic Engineering . . . . . . . . . . . . 8
4.1. Path Computation . . . . . . . . . . . . . . . . . . . . . 8
4.2. Bandwidth Reservation . . . . . . . . . . . . . . . . . . 8
4.3. Disjoint Path . . . . . . . . . . . . . . . . . . . . . . 8
4.4. Service Preemption . . . . . . . . . . . . . . . . . . . . 8
4.5. Share Risk Link Groups . . . . . . . . . . . . . . . . . . 8
4.6. Multi-Homing . . . . . . . . . . . . . . . . . . . . . . . 8
4.6.1. Ingress and Egress Protection . . . . . . . . . . . . 9
5. Packet Protection Applications . . . . . . . . . . . . . . . . 9
5.1. Single Domain Service Protection . . . . . . . . . . . . . 10
5.2. Multi-domain Service Protection . . . . . . . . . . . . . 10
5.3. Backup Path Computation . . . . . . . . . . . . . . . . . 10
5.4. Fast Reroute (FRR) Path Computation . . . . . . . . . . . 10
5.4.1. Methods to find MP and calculate the optimal
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