Standard Representation Of Domain-Sequence
draft-ietf-pce-pcep-domain-sequence-02

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Document Type Active Internet-Draft (pce WG)
Last updated 2013-02-18
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 India Pvt
Expires: August 5, 2013                                              Ltd
                                                             R. Casellas
                                             CTTC - Centre Tecnologic de
                                          Telecomunicacions de Catalunya
                                                                Feb 2013

               Standard Representation Of Domain-Sequence
                 draft-ietf-pce-pcep-domain-sequence-02

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 for P2P and P2MP scenarios.  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 IGP area or an Autonomous Systems.  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.  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 August 5, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dhody, et al.            Expires August 5, 2013                 [Page 1]
Internet-Draft                 DOMAIN SEQ                       Feb 2013

   This document is subject to BCP 78 and the IETF Trust's Legal
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Dhody, et al.            Expires August 5, 2013                 [Page 2]
Internet-Draft                 DOMAIN SEQ                       Feb 2013

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Detail Description . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.  Domains  . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.2.  Domain-Sequence  . . . . . . . . . . . . . . . . . . . . .  6
     3.3.  Standard Representation  . . . . . . . . . . . . . . . . .  7
     3.4.  Include Route Object (IRO) . . . . . . . . . . . . . . . .  8
       3.4.1.  Subobjects . . . . . . . . . . . . . . . . . . . . . .  8
       3.4.2.  Option (A): New IRO Object Type  . . . . . . . . . . . 10
         3.4.2.1.  Handling of the Domain-Sequence IRO object . . . . 11
       3.4.3.  Option B: Existing IRO Object Type . . . . . . . . . . 13
     3.5.  Exclude Route Object (XRO) . . . . . . . . . . . . . . . . 14
       3.5.1.  Subobjects . . . . . . . . . . . . . . . . . . . . . . 14
         3.5.1.1.  Autonomous system  . . . . . . . . . . . . . . . . 14
         3.5.1.2.  IGP Area . . . . . . . . . . . . . . . . . . . . . 15
     3.6.  Explicit Exclusion Route Subobject (EXRS)  . . . . . . . . 16
     3.7.  Explicit Route Object (ERO)  . . . . . . . . . . . . . . . 17
   4.  Other Considerations . . . . . . . . . . . . . . . . . . . . . 18
     4.1.  Inter-Area Path Computation  . . . . . . . . . . . . . . . 18
     4.2.  Inter-AS Path Computation  . . . . . . . . . . . . . . . . 20
       4.2.1.  Example 1  . . . . . . . . . . . . . . . . . . . . . . 20
       4.2.2.  Example 2  . . . . . . . . . . . . . . . . . . . . . . 22
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