Network Working Group T. Dreibholz
Internet-Draft Simula Research Laboratory
Intended status: Experimental January 12, 2015
Expires: July 16, 2015
Handle Resolution Option for ASAP
draft-dreibholz-rserpool-asap-hropt-16.txt
Abstract
This document describes the Handle Resolution option for the ASAP
protocol.
Status of This Memo
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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, March 1997.
[RFC5351] Lei, P., Ong, L., Tuexen, M., and T. Dreibholz, "An
Overview of Reliable Server Pooling Protocols", RFC 5351,
September 2008.
[RFC5352] Stewart, R., Xie, Q., Stillman, M., and M. Tuexen,
"Aggregate Server Access Protocol (ASAP)", RFC 5352,
September 2008.
[RFC5353] Xie, Q., Stewart, R., Stillman, M., Tuexen, M., and A.
Silverton, "Endpoint Handlespace Redundancy Protocol
(ENRP)", RFC 5353, September 2008.
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[RFC5354] Stewart, R., Xie, Q., Stillman, M., and M. Tuexen,
"Aggregate Server Access Protocol (ASAP) and Endpoint
Handlespace Redundancy Protocol (ENRP) Parameters", RFC
5354, September 2008.
[RFC5355] Stillman, M., 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, September 2008.
[RFC5356] Dreibholz, T. and M. Tuexen, "Reliable Server Pooling
Policies", RFC 5356, September 2008.
[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-14 (work in progress), July 2014.
[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-12 (work in progress), July 2014.
8.2. Informative References
[Dre2006] Dreibholz, T., "Reliable Server Pooling - Evaluation,
Optimization and Extension of a Novel IETF Architecture",
March 2007, <http://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), Volume
2, Number 1, Pages 1-14, ISSN 1942-2652, June 2009,
<http://www.tdr.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), Volume 1, Number 2, Pages 17-32,
ISSN 1738-9968, April 2008, <http://www.tdr.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,
<http://www.tdr.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, <http://simula.no/publications/
threfereedinproceedingsreference.2012-12-20.7643198512/
simula_pdf_file>.
[RSerPool-Website]
Dreibholz, T., "Thomas Dreibholz's RSerPool Page", Online:
http://www.iem.uni-due.de/~dreibh/rserpool/, 2013,
<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/, 2014,
<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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