Standard Representation of Domain-Sequence
draft-ietf-pce-pcep-domain-sequence-08

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Last updated 2015-04-30
Replaces draft-dhody-pce-pcep-domain-sequence
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PCE Working Group                                               D. Dhody
Internet-Draft                                                  U. Palle
Intended status: Experimental                        Huawei Technologies
Expires: November 1, 2015                                    R. Casellas
                                                                    CTTC
                                                          April 30, 2015

               Standard Representation of Domain-Sequence
                 draft-ietf-pce-pcep-domain-sequence-08

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 standard 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 Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on November 1, 2015.

Dhody, et al.           Expires November 1, 2015                [Page 1]
Internet-Draft                 DOMAIN SEQ                     April 2015

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   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)  . . . . . . . . . . . . . . .   7
       3.4.1.  Subobjects  . . . . . . . . . . . . . . . . . . . . .   8
         3.4.1.1.  Autonomous system . . . . . . . . . . . . . . . .   8
         3.4.1.2.  IGP Area  . . . . . . . . . . . . . . . . . . . .   8
       3.4.2.  Update in IRO specification . . . . . . . . . . . . .  10
       3.4.3.  IRO for Domain-Sequence . . . . . . . . . . . . . . .  10
     3.5.  Exclude Route Object (XRO)  . . . . . . . . . . . . . . .  12
       3.5.1.  Subobjects  . . . . . . . . . . . . . . . . . . . . .  12
         3.5.1.1.  Autonomous system . . . . . . . . . . . . . . . .  12
         3.5.1.2.  IGP Area  . . . . . . . . . . . . . . . . . . . .  13
     3.6.  Explicit Exclusion Route Subobject (EXRS) . . . . . . . .  14
     3.7.  Explicit Route Object (ERO) . . . . . . . . . . . . . . .  15
   4.  Other Considerations  . . . . . . . . . . . . . . . . . . . .  15
     4.1.  Inter-Area Path Computation . . . . . . . . . . . . . . .  15
     4.2.  Inter-AS Path Computation . . . . . . . . . . . . . . . .  17
       4.2.1.  Example 1 . . . . . . . . . . . . . . . . . . . . . .  18
       4.2.2.  Example 2 . . . . . . . . . . . . . . . . . . . . . .  20
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