INTERNET-DRAFT L. Coene(Ed)
Internet Engineering Task Force Siemens
Issued: June 2002
Expires: December 2002
Relialeble Serverpool applicability statement
<draft-coene-rserpool-applic-00.txt>
Status of this Memo
This document is an Internet-Draft and is in full conformance with
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Abstract
This document describes the applicability of the Aggregate Server
Access Protocol(ASAP) and Endpoint Name Resolution Protocol(ENRP)
developed for relialeble serverpooling. Also some guidance is given
on the choice of underlying transport protocol(and corresponding
transport protocol mapping) for transporting application data and
ASAP/ENRP specific control data.
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Table of contents
Relialeble Serverpooling Applicability statement ............... ii
Chapter 1: Introduction ........................................ 2
Chapter 1.1: Scope ..... ....................................... 3
Chapter 1.2: Terminology ....................................... 3
Chapter 1.3: Contributors ...................................... 3
Chapter 2: Rserpool architecture ............................... 4
Chapter 2.1: Overview .......................................... 4
Chapter 2.2: ASAP/ENRP applicability ........................... 4
Chapter 2.3: Application and Control data Transport ............ 4
Chapter 2.4: Rserpool use between 2 pools ...................... 4
Chapter 3: Issues for Relialeble Serverpooling ................. 4
Chapter 3.1: State transfer between Pool Elements .............. 4
Chapter 4: Security considerations ............................. 5
Chapter 5: References and related work ......................... 5
Chapter 6: Acknowledgments ..................................... 6
Chapter 7: Author's address .................................... 6
1 INTRODUCTION
Relialable serverpooling provides protocols for providing higly
avialable services. Thie services are located in pool of redundant
servers and if a server fails, another server will take over. The
only requirement put on these servers belonging to the pool is that if
state is maintained by the server, this state must be transfered
to the other server taking over. The mechanism for transfering this
state information is NOT part of the Relialable server pooling
architecture and/or protocols and must be provided by other protocols.
The goal is to provide server based redundancy. Transport and
network level redundancy are handle by the transport and network layer
protcols.
The application may choose to distribute its traffic over the servers
of the pool conforming to a certain policy.
The application wishing to make use of Rserpool protocols may use
different transpoart layers(such as UDP, TCP and SCTP). However some
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Draft Rserpool Applicability Statement June 2002
transport layers may have restrictions build in in the way they
migth be operazting in the Rserpool architecture and its protocols.
1.1 Scope
The scope of this document is to explain the way that Reslialbale
server pool protocols have to be used to provide a higly available
service towards the application in the network.
1.2 Terminology
The terms are commonly identified in related work and can be found
in the Aggregate Server Access Protocol and Endpoint Name Resolution
Protocol Common Parameters document[RFCCOMM].
1.3 Contributors
The following people contributed to the document: L. Coene(Editor),
x, y and z.
2 Rserpool architecture
2.1 Overview
A overview of the relialable serverpool architecture is given in the
Rserpool architecture document[RFCARCH].
2.2 ASAP/ENRP applicability
2.3 Application and Control data Transport
2.4 Rserpool use between 2 pools
3 Issues for Relialeble Serverpooling
3.1 State transfer accoss the server pool
Rserpool protocols(ENRP and ASAP) do NOT provide any service for
transfering state information of a application from one Processing
Element(PE) to another.
4 Security considerations
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The protocols used in the Relialable serverpool architecture only
tries to increase the availability of the servers in the
network. Rserpool protocols does not contain any protocol mechanisms
which are directly related to user message authentication, integrity
and confidentiality functions. For such features, it depends on the
IPSEC protocols or on Trasnport Layer Security(TLS) protocols for
its own security and on the architecture and/or on security features
of its user protocols.
Rserpool architecture allows the use of different Transport
protocols for its application and control data exchange. Those
transport protocols may have mechanisms for reducing the risk of
blind denial-of-service attacks and/or masquerade attacks. If such
measures are required by the applications, then it is advised to
check the SCTP applicability statement[RFC3057] for guidance on this
issue.
5 References and related work
[RFC3237] Tuexen, M., Xie, Q., Stewart, R.R., Shore, M., Ong, L.,
Loughney, J., Stillman, M., "Requirements for Reliable Server
Pooling", January 2002
[RFCARCH] Tuexen, M., Xie, Q., Stewart, R.R., Shore, M., Ong, L.,
Loughney, J., Stillman, M., "Architecture for Reliable Server
Pooling", <draft-ietf-rserpool-arch-02.txt> , October 2002.
[RFCASAP] Stewart, R.R., Xie, Q., Stillman, M., "Aggregate Server
Access Protocol (ASAP)", <draft-ietf-rserpool-asap-03.txt>, work in
progress
[RFCENRP] Xie, Q., Stewart, R.R., Stillman, M., "Endpoint Name
Resolution Protocol (ENRP)", <draft-ietf-rserpool-enrp-03.txt>, work
in progress
[RFCCOMM] Stewart, R.R., Xie, Q., "Aggregate Server Access Protocol
and Endpoint Name Resolution Protocol Common Parameters",
<draft-ietf-rserpool-common-param-00.txt>, work in progress
[RFCSERV] Conrad, P., Lei, P., "Services Provided By Reliable Server
Pooling", <draft-conrad-rserpool-service-01.txt>, work in progress
[RFC2960] Stewart, R. R., Xie, Q., Morneault, K., Sharp, C. , ,
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Schwarzbauer, H. J., Taylor, T., Rytina, I., Kalla, M., Zhang,
L. and Paxson, V, "Stream Control Transmission Protocol", RFC2960,
October 2000.
[RF3257] Coene, L., Tuexen, M., Verwimp, G., Loughney, J., Stewart,
R. R., Xie, Q., Holdrege, M., Belinchon, M.C., and Jungmayer, A.,
"Stream Control Transmission Protocol Applicability statement",
RFCzzzz, April 2002.
6 Acknowledgments
The authors wish to thank X, Y and M. Stillman and many others
for their invaluable comments.
7 Author's Address
Lode Coene Phone: +32-14-252081
Siemens Atea EMail: lode.coene@siemens.atea.be
Atealaan 34
B-2200 Herentals
Belgium
Expires: December 2002
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