Network Working Group T. Dreibholz
Internet-Draft University of Duisburg-Essen
Intended status: Standards Track June 6, 2007
Expires: December 8, 2007
Handle Resolution Option for ASAP
draft-dreibholz-rserpool-asap-hropt-00.txt
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Copyright (C) The IETF Trust (2007).
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Abstract
This document describes the Handle Resolution option for the ASAP
protocol.
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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 [7], [9], 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
[8] 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.
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 ietf-rserpool-common-
param [4]
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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.
2.2. Reference Implementation
The reference implementation based on the RSerPool prototype rsplib
can be found at [6].
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3. References
3.1. Normative References
[1] Tuexen, M., "Architecture for Reliable Server Pooling",
draft-ietf-rserpool-arch-12 (work in progress), November 2006.
[2] Stewart, R., "Aggregate Server Access Protocol (ASAP)",
draft-ietf-rserpool-asap-15 (work in progress), January 2007.
[3] Stewart, R., "Endpoint Handlespace Redundancy Protocol (ENRP)",
draft-ietf-rserpool-enrp-15 (work in progress), January 2007.
[4] Stewart, R., "Aggregate Server Access Protocol (ASAP) and
Endpoint Handlespace Redundancy Protocol (ENRP) Parameters",
draft-ietf-rserpool-common-param-11 (work in progress),
October 2006.
[5] Tuexen, M. and T. Dreibholz, "Reliable Server Pooling
Policies", draft-ietf-rserpool-policies-04 (work in progress),
March 2007.
3.2. Informative References
[6] Dreibholz, T., "Thomas Dreibholz's RSerPool Page",
URL: http://tdrwww.exp-math.uni-essen.de/dreibholz/rserpool/.
[7] Dreibholz, T., "Reliable Server Pooling -- Evaluation,
Optimization and Extension of a Novel IETF Architecture", Ph.D.
Thesis University of Duisburg-Essen, Faculty of Economics,
Institute for Computer Science and Business Information
Systems, URL: http://duepublico.uni-duisburg-essen.de/servlets/
DerivateServlet/Derivate-16326/Dre2006-final.pdf, March 2007.
[8] Dreibholz, T. and E. Rathgeb, "On the Performance of Reliable
Server Pooling Systems", Proceedings of the 30th IEEE Local
Computer Networks Conference, November 2005.
[9] Dreibholz, T. and E. Rathgeb, "Implementing the Reliable Server
Pooling Framework", Proceedings of the 8th IEEE International
Conference on Telecommunications, June 2005.
[10] Dreibholz, T. and E. Rathgeb, "An Application Demonstration of
the Reliable Server Pooling Framework", Proceedings of the 24th
IEEE Infocom, March 2005.
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Author's Address
Thomas Dreibholz
University of Duisburg-Essen, Institute for Experimental Mathematics
Ellernstrasse 29
45326 Essen, Nordrhein-Westfalen
Germany
Phone: +49-201-1837637
Fax: +49-201-1837673
Email: dreibh@exp-math.uni-essen.de
URI: http://www.exp-math.uni-essen.de/~dreibh/
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