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Network Working Group                                       T. Dreibholz
Internet-Draft                                Simula Research Laboratory
Intended status: Experimental                           January 23, 2017
Expires: July 27, 2017


                   Handle Resolution Option for ASAP
               draft-dreibholz-rserpool-asap-hropt-20.txt

Abstract

   This document describes the Handle Resolution option for the ASAP
   protocol.

Status of This Memo

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

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   This Internet-Draft will expire on July 27, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Handle Resolution Option  . . . . . . . . . . . . . . . . . .   3
     2.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Reference Implementation  . . . . . . . . . . . . . . . . . .   3
   4.  Testbed Platform  . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Reliable Server Pooling defines protocols for providing highly
   available services.  The Aggregate Server Access Protocol (ASAP)
   provides session management and server selection for applications.
   Upon request for a server selection -- denoted as handle resolution
   -- an ENRP server returns a list of selected PE identities.  The
   number of PE identities to be returned is not specified by RSerPool.
   Furthermore the ASAP protocol does not contain a way for letting the
   requesting instance specify it.

   As shown in [Dre2006], [IJAIT2009], [IJHIT2008], selecting too many
   entries does not make sense for the application, but on the other
   hand also result in significant processing and network overhead.
   Furthermore, it has been shown in [LCN2005] that the number of
   requested elements is usually 1, but there are application cases
   where more PE identities have to be returned.  That is, there should
   be a possibility to specify the number of requested PE items upon a
   handle resolution.

1.1.  Scope

   The Handle Resolution option defined in this draft simply defines an
   option to let the PU-side specify the desired number of PE identities
   from the ENRP server.








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1.2.  Terminology

   The terms are commonly identified in related work and can be found in
   the Aggregate Server Access Protocol and Endpoint Handlespace
   Redundancy Protocol Common Parameters document RFC 5354 [RFC5354].

1.3.  Conventions

   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].

2.  Handle Resolution Option

2.1.  Definition

   The Handle Resolution MAY be used once in an ASAP Handle Resolution
   message sent from a PU to an ENRP server.  It is defined as follows.

      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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |        Type = 0x803f         |            Length=8            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                             Items                             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Items: 32 bits (unsigned integer)

   Contains the number of PE identities to be selected by the ENRP
   server.  Setting it to 0xffffffff denotes to obtain as many PE
   identities as possible.  A setting of 0 denotes to use the ENRP
   server's default value; this default MUST be used if there is no
   Handle Resolution option given.  The ENRP server SHOULD try to fulfil
   the request for the given number of items.

   Note, that the high-order bits of the type field are set to 10, which
   means "skip this parameter and continue processing" if this parameter
   type is not supported by the ENRP server.  This allows for
   interoperability with old implementations.

3.  Reference Implementation

   The RSerPool reference implementation RSPLIB can be found at
   [RSerPool-Website].  It supports the functionalities defined by
   [RFC5351], [RFC5352], [RFC5353], [RFC5354] and [RFC5356] as well as
   the options [I-D.dreibholz-rserpool-delay],
   [I-D.dreibholz-rserpool-enrp-takeover] and of course the option



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   defined by this document.  An introduction to this implementation is
   provided in [Dre2006].

4.  Testbed Platform

   A large-scale and realistic Internet testbed platform with support
   for the multi-homing feature of the underlying SCTP protocol is
   NorNet.  A description of NorNet is provided in [PAMS2013-NorNet],
   some further information can be found on the project website
   [NorNet-Website].

5.  Security Considerations

   Security considerations for RSerPool systems are described by
   [RFC5355].

6.  IANA Considerations

   This document does not require additional IANA actions beyond those
   already identified in the ENRP and ASAP protocol specifications.

7.  Acknowledgments

   The author would like to thank Nihad Cosic, Dirk Hoffstadt, Michael
   Kohnen, Jobin Pulinthanath and Xing Zhou for their support.

8.  References

8.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC5351]  Lei, P., Ong, L., Tuexen, M., and T. Dreibholz, "An
              Overview of Reliable Server Pooling Protocols", RFC 5351,
              DOI 10.17487/RFC5351, September 2008,
              <http://www.rfc-editor.org/info/rfc5351>.

   [RFC5352]  Stewart, R., Xie, Q., Stillman, M., and M. Tuexen,
              "Aggregate Server Access Protocol (ASAP)", RFC 5352,
              DOI 10.17487/RFC5352, September 2008,
              <http://www.rfc-editor.org/info/rfc5352>.







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   [RFC5353]  Xie, Q., Stewart, R., Stillman, M., Tuexen, M., and A.
              Silverton, "Endpoint Handlespace Redundancy Protocol
              (ENRP)", RFC 5353, DOI 10.17487/RFC5353, September 2008,
              <http://www.rfc-editor.org/info/rfc5353>.

   [RFC5354]  Stewart, R., Xie, Q., Stillman, M., and M. Tuexen,
              "Aggregate Server Access Protocol (ASAP) and Endpoint
              Handlespace Redundancy Protocol (ENRP) Parameters",
              RFC 5354, DOI 10.17487/RFC5354, September 2008,
              <http://www.rfc-editor.org/info/rfc5354>.

   [RFC5355]  Stillman, M., Ed., Gopal, R., Guttman, E., Sengodan, S.,
              and M. Holdrege, "Threats Introduced by Reliable Server
              Pooling (RSerPool) and Requirements for Security in
              Response to Threats", RFC 5355, DOI 10.17487/RFC5355,
              September 2008, <http://www.rfc-editor.org/info/rfc5355>.

   [RFC5356]  Dreibholz, T. and M. Tuexen, "Reliable Server Pooling
              Policies", RFC 5356, DOI 10.17487/RFC5356, September 2008,
              <http://www.rfc-editor.org/info/rfc5356>.

   [I-D.dreibholz-rserpool-delay]
              Dreibholz, T. and X. Zhou, "Definition of a Delay
              Measurement Infrastructure and Delay-Sensitive Least-Used
              Policy for Reliable Server Pooling", draft-dreibholz-
              rserpool-delay-18 (work in progress), July 2016.

   [I-D.dreibholz-rserpool-enrp-takeover]
              Dreibholz, T. and X. Zhou, "Takeover Suggestion Flag for
              the ENRP Handle Update Message", draft-dreibholz-rserpool-
              enrp-takeover-16 (work in progress), July 2016.

8.2.  Informative References

   [Dre2006]  Dreibholz, T., "Reliable Server Pooling - Evaluation,
              Optimization and Extension of a Novel IETF Architecture",
              March 2007, <https://duepublico.uni-duisburg-
              essen.de/servlets/DerivateServlet/Derivate-16326/
              Dre2006_final.pdf>.

   [IJAIT2009]
              Dreibholz, T. and E. Rathgeb, "Overview and Evaluation of
              the Server Redundancy and Session Failover Mechanisms in
              the Reliable Server Pooling Framework", International
              Journal on Advances in Internet Technology (IJAIT) Number
              1, Volume 2, Pages 1-14, ISSN 1942-2652, June 2009,
              <https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
              TDR/ReliableServer/Publications/IJAIT2009.pdf>.



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   [IJHIT2008]
              Dreibholz, T. and E. Rathgeb, "An Evaluation of the Pool
              Maintenance Overhead in Reliable Server Pooling Systems",
              SERSC International Journal on Hybrid Information
              Technology (IJHIT) Number 2, Volume 1, Pages 17-32,
              ISSN 1738-9968, April 2008, <https://www.wiwi.uni-
              due.de/fileadmin/fileupload/I-
              TDR/ReliableServer/Publications/IJHIT2008.pdf>.

   [LCN2005]  Dreibholz, T. and E. Rathgeb, "On the Performance of
              Reliable Server Pooling Systems", Proceedings of the IEEE
              Conference on Local Computer Networks (LCN) 30th
              Anniversary Pages 200-208, ISBN 0-7695-2421-4,
              DOI 10.1109/LCN.2005.98, November 2005,
              <https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
              TDR/ReliableServer/Publications/LCN2005.pdf>.

   [PAMS2013-NorNet]
              Dreibholz, T. and E. Gran, "Design and Implementation of
              the NorNet Core Research Testbed for Multi-Homed Systems",
              Proceedings of the 3nd International Workshop on Protocols
              and Applications with Multi-Homing Support (PAMS) Pages
              1094-1100, ISBN 978-0-7695-4952-1,
              DOI 10.1109/WAINA.2013.71, March 2013,
              <https://www.simula.no/sites/www.simula.no/files/
              publications/threfereedinproceedingsreference.2012-12-20.7
              643198512.pdf>.

   [RSerPool-Website]
              Dreibholz, T., "Thomas Dreibholz's RSerPool Page",
              Online: http://www.iem.uni-due.de/~dreibh/rserpool/, 2016,
              <http://www.iem.uni-due.de/~dreibh/rserpool/>.

   [NorNet-Website]
              Dreibholz, T., "NorNet -- A Real-World, Large-Scale Multi-
              Homing Testbed", Online: https://www.nntb.no/, 2016,
              <https://www.nntb.no/>.

Author's Address












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   Thomas Dreibholz
   Simula Research Laboratory, Network Systems Group
   Martin Linges vei 17
   1364 Fornebu, Akershus
   Norway

   Phone: +47-6782-8200
   Fax:   +47-6782-8201
   Email: dreibh@simula.no
   URI:   http://www.iem.uni-due.de/~dreibh/









































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