CCAMP                                                     F. Le Faucheur
Internet-Draft                                              A. Narayanan
Intended status: Standards Track                             S. Dhesikan
Expires: April 21, 2011                                            Cisco
                                                        October 18, 2010


        RSVP Resource Sharing Remote Identification Association
             draft-ietf-ccamp-rsvp-resource-sharing-00.txt

Abstract

   The RSVP ASSOCIATION object allows to create association across RSVP
   path states or across Resv states.  Two association types are
   currently defined: recovery and resource sharing.  This document
   defines a new association type called "Resource Sharing Remote
   Identification".  It can be used by the sender to convey to the
   receiver the information that can then be used by the receiver to
   identify a downstream initiated resource sharing association.

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   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Conventions Used in This Document  . . . . . . . . . . . .  4
   2.  Resource Sharing Remote Identification Association . . . . . .  5
   3.  Security Considerations  . . . . . . . . . . . . . . . . . . .  7
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
     4.1.  Resource Sharing Remote Identification Association Type  .  8
   5.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . .  9
   6.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     6.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     6.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11





















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1.  Introduction

   The notion of association as well as the corresponding RSVP
   ASSOCIATION object are defined in [RFC4872] and [RFC4873] in the
   context of GMPLS (Generalized Multi-Protocol Label Switching)
   controlled label switched paths (LSPs).  In this context, the object
   is used to associate recovery LSPs with the LSP they are protecting.
   This object also has broader applicability as a mechanism to
   associate RSVP state, and [I-D.ietf-ccamp-assoc-info] defines how the
   ASSOCIATION object can be more generally applied.  [I-D.ietf-ccamp-
   assoc-info] also reviews how the association is to be provided in the
   context of GMPLS recovery.

   [RFC4872] defines the IPv4 ASSOCIATION object and the IPv6
   ASSOCIATION object.  In addition, [I-D.ietf-ccamp-assoc-info] defines
   the Extended IPv4 ASSOCIATION object and the Extended IPv6
   ASSOCIATION object.  These four forms of the ASSOCIATION object
   contain an Association Type field that indicates the type of
   association being identified by the ASSOCIATION object.  For example,
   Figure 1 illustrates the format of the IPv4 ASSOCIATION object.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |            Length             | Class-Num(199)|  C-Type (1)   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |       Association Type        |       Association ID          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                  IPv4 Association Source                      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                 Figure 1: IPv4 ASSOCIATION object format

   [RFC4872] and [RFC4873] define two association types: recovery and
   resource sharing.  Recovery type association is only applicable
   within the context of recovery ( [RFC4872] and [RFC4873]).  Resource
   sharing is generally useful and its general use is defined in section
   4.3.1 of [I-D.ietf-ccamp-assoc-info].  For non-recovery Usage (for
   example for resource sharing), [I-D.ietf-ccamp-assoc-info] defines,
   in section 4, the notion of upstream initiated association and
   downstream initiated association.  Upstream initiated association is
   represented in ASSOCIATION objects carried in Path messages and can
   be used to associate RSVP Path state across MPLS Tunnels / RSVP
   sessions.  Downstream initiated association is represented in
   ASSOCIATION objects carried in Resv messages and can be used to
   associate RSVP Resv state across MPLS Tunnels / RSVP sessions.




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   This document defines a new association type called "Resource Sharing
   Remote Identification".

1.1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].











































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2.  Resource Sharing Remote Identification Association

   We define here a new association type called the Resource Sharing
   Remote Identification.

   The Resource Sharing Remote Identification association is only
   defined for use in upstream initiated association.  Thus it can only
   appear in ASSOCIATION objects signaled in Path messages.

   The Resource Sharing Remote Identification association can be used by
   the sender to convey to the receiver (inside the Association Source
   and Association ID fields), information that can then be used by the
   receiver to identify an upstream initiated resource sharing
   association.  This is useful in upstream initiated resource sharing
   applications where the identification of the resource sharing
   association is not known a priori by the receiver, and instead is
   known by the sender (for example because the sender is in a better
   position to assign the association identification necessary to
   implement the desired resource sharing across RSVP sessions).

   [I-D.ietf-ccamp-assoc-info] discusses the rules associated with the
   processing of ASSOCIATION objects in RSVP messages.  In addition to
   generic rules applicable to all association types, a given
   association type may define type-specific processing rules.  The
   following type-specific association rule is defined for the Resource
   Sharing Remote Identification association type:

   o  The Resource Sharing Remote Identification association does not
      create any association across Path states.

   This is because the purpose of signaling an Resource Sharing Remote
   Identification association in the downstream direction is purely to
   convey identification information from the sender to the receiver
   that can be used by the receiver to establish an upstream initiated
   resource sharing association.

   Any implementation of the present specification MUST support the
   Resource Sharing Remote Identification association.

   On receipt of an ASSOCIATION object whose association type is
   Resource Sharing Remote Identification, the receiver MAY use the
   association identification information contained in the received
   ASSOCIATION object as the association identification information in
   an upstream initiated resource sharing association.

   On receipt of an ASSOCIATION object whose association type is
   Resource Sharing Remote Identification, an RSVP receiver proxy as
   defined in [RFC5945], SHOULD initiate an upstream initiated Resource



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   Sharing association whose association identification information is
   copied from the received ASSOCIATION object.  This behavior MAY be
   overridden by local policy on the receiver proxy.
















































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3.  Security Considerations

   TBD.
















































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4.  IANA Considerations

   IANA is requested to administer assignment of new values for
   namespaces in accordance with codepoints defined in this document and
   summarized in this section.

4.1.  Resource Sharing Remote Identification Association Type

   This document defines, in Section 2, a new association type.  Thus,
   IANA is requested to allocate the following entry in the Association
   Type registry found at
   http://www.iana.org/assignments/gmpls-sig-parameters/ :

      3 Resource Sharing Remote Identification (I) [this-document]

   There are no other IANA considerations introduced by this document.



































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5.  Acknowledgments

   We thank Lou Berger for his guidance in this work and in particular
   with respect to aligning it with the related CCAMP work on
   Association .














































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6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC4872]  Lang, J., Rekhter, Y., and D. Papadimitriou, "RSVP-TE
              Extensions in Support of End-to-End Generalized Multi-
              Protocol Label Switching (GMPLS) Recovery", RFC 4872,
              May 2007.

   [RFC4873]  Berger, L., Bryskin, I., Papadimitriou, D., and A. Farrel,
              "GMPLS Segment Recovery", RFC 4873, May 2007.

6.2.  Informative References

   [RFC5945]  Le Faucheur, F., Manner, J., Wing, D., and A. Guillou,
              "Resource Reservation Protocol (RSVP) Proxy Approaches",
              RFC 5945, October 2010.































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Authors' Addresses

   Francois Le Faucheur
   Cisco Systems
   Greenside, 400 Avenue de Roumanille
   Sophia Antipolis  06410
   France

   Phone: +33 4 97 23 26 19
   Email: flefauch@cisco.com


   Ashok Narayanan
   Cisco Systems
   300 Beaver Brook Road
   Boxborough, MAS  01719
   United States

   Email: ashokn@cisco.com


   Subha Dhesikan
   Cisco Systems

   Phone:
   Email: sdhesika@cisco.com

























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