Domain Subobjects for the Path Computation Element Communication Protocol (PCEP)
RFC 7897

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06
• 07
• 08
• 09
• 10
• 11
• 12

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

Copyright Notice

   Copyright (c) 2016 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 Simplified BSD License.

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