Domain Subobjects for the Path Computation Element Communication Protocol (PCEP)
RFC 7897
Internet Engineering Task Force (IETF) D. Dhody
Request for Comments: 7897 U. Palle
Category: Experimental Huawei Technologies
ISSN: 2070-1721 R. Casellas
CTTC
June 2016
Domain Subobjects
for the Path Computation Element Communication Protocol (PCEP)
Abstract
The ability to compute shortest constrained Traffic Engineering Label
Switched Paths (TE LSPs) in Multiprotocol Label Switching (MPLS) and
Generalized MPLS (GMPLS) networks across multiple domains has been
identified as a key requirement. In this context, a domain is a
collection of network elements within a common sphere of address
management or path computational responsibility such as an Interior
Gateway Protocol (IGP) area or an Autonomous System (AS). This
document specifies a representation and encoding of a domain
sequence, which is defined as an ordered sequence of domains
traversed to reach the destination domain to be used by Path
Computation Elements (PCEs) to compute inter-domain constrained
shortest paths across a predetermined sequence of domains. This
document also defines new subobjects to be used to encode domain
identifiers.
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 7841.
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/rfc7897.
Dhody, et al. Experimental [Page 1]
RFC 7897 Domain Subobjects for PCEP June 2016
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Detail Description . . . . . . . . . . . . . . . . . . . . . 6
3.1. Domains . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2. Domain Sequence . . . . . . . . . . . . . . . . . . . . . 6
3.3. Domain Sequence Representation . . . . . . . . . . . . . 7
3.4. Include Route Object (IRO) . . . . . . . . . . . . . . . 8
3.4.1. Subobjects . . . . . . . . . . . . . . . . . . . . . 8
3.4.1.1. Autonomous System . . . . . . . . . . . . . . . . 8
3.4.1.2. IGP Area . . . . . . . . . . . . . . . . . . . . 9
3.4.2. Update in IRO Specification . . . . . . . . . . . . . 10
3.4.3. IRO for Domain Sequence . . . . . . . . . . . . . . . 11
3.4.3.1. PCC Procedures . . . . . . . . . . . . . . . . . 11
3.4.3.2. PCE Procedures . . . . . . . . . . . . . . . . . 11
3.5. Exclude Route Object (XRO) . . . . . . . . . . . . . . . 13
3.5.1. Subobjects . . . . . . . . . . . . . . . . . . . . . 13
3.5.1.1. Autonomous System . . . . . . . . . . . . . . . . 14
3.5.1.2. IGP Area . . . . . . . . . . . . . . . . . . . . 14
3.6. Explicit Exclusion Route Subobject (EXRS) . . . . . . . . 16
3.7. Explicit Route Object (ERO) . . . . . . . . . . . . . . . 16
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1. Inter-Area Path Computation . . . . . . . . . . . . . . . 17
4.2. Inter-AS Path Computation . . . . . . . . . . . . . . . . 19
4.2.1. Example 1 . . . . . . . . . . . . . . . . . . . . . . 20
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