Ideas for a Next Generation of the Reliable Server Pooling Framework
draft-dreibholz-rserpool-nextgen-ideas-15
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Thomas Dreibholz
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Network Working Group T. Dreibholz
Internet-Draft SimulaMet
Intended status: Informational March 13, 2021
Expires: September 14, 2021
Ideas for a Next Generation of the Reliable Server Pooling Framework
draft-dreibholz-rserpool-nextgen-ideas-15
Abstract
This document collects some idea for a next generation of the
Reliable Server Pooling framework.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 14, 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 2
1.2. Reliable Server Pooling . . . . . . . . . . . . . . . . . 2
1.3. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. What to Change in the Next Generation of RSerPool? . . . . . 3
2.1. Security Considerations . . . . . . . . . . . . . . . . . 4
2.2. IANA Considerations . . . . . . . . . . . . . . . . . . . 4
3. Reference Implementation . . . . . . . . . . . . . . . . . . 4
4. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
1.1. Abbreviations
o ASAP: Aggregate Server Access Protocol
o ENRP: Endpoint Handlespace Redundancy Protocol
o ID: Identifier
o MPTCP: Multi-Path Transmission Control Protocol
o PE: Pool Element
o PR: Pool Registrar
o PU: Pool User
o RSerPool: Reliable Server Pooling
o SCTP: Stream Control Transmission Protocol
o TCP: Transmission Control Protocol
o VNFPOOL: Virtual Network Function Resource Pooling
1.2. Reliable Server Pooling
Reliable Server Pooling (RSerPool) has been defined as RFCs in [1],
[2], [3], [4], [5], [6], [7], [8]. There is also a detailed
introduction provided by [16] as well as lots of further information
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material on [22]. RSerPool is therefore not introduced in more
detail here.
1.3. Scope
The scope of this document is to collect some ideas of what to
update/change for a next generation of the RSerPool framework. It is
a result of lessons learned with more than one decade of RSerPool
deployment (see also [17], [18], [19]) as well as ongoing discussions
on applying RSerPool for Virtual Network Function Resource
Pooling (VNFPOOL; as introduced in more detail in [15]).
2. What to Change in the Next Generation of RSerPool?
o ENRP servers denote the management systems in the context of
RSerPool. The term "server" is misleading, since ENRP servers are
actually ENRP peers. Literature on RSerPool -- for example [16]
-- therefore uses the more accurate term "Pool Registrar" (PR). A
future revision of RSerPool should also use this term. (The
RSerPool documents did not use "registrar" to avoid confusion with
SIP registrars.)
o Pool Element Identifiers (PE ID) and Pool Registrar
Identifiers (PR ID) are 32-bit random numbers used for the
identification of PEs and PRs. Since 64-bit CPUs are standard
since quite a long time, these IDs should be extended to 64 bits.
o ENRP uses the Internet-16 checksum defined in [9] to detect
handlespace inconsistencies. It is trivially possible to extend
the underlying algorithm to 32 bits, and the computation is more
efficient on today's CPUs. The checksum algorithm should
therefore be changed. (The Internet-16 checksum was finally
chosen in 2005 after long decisions to avoid any possible patent
issues. The trivial extension of Internet-16 to Internet-32 is
probably not an issue any more?)
o PR failures lead to possible concentration of all PUs and PEs at a
single PR. To achieve a better load balancing, the solution ENRP
Takeover Suggestion -- as defined in [14] -- should be included in
ENRP.
o For a Handle Resolution, a PR has to decide on how many PEs to
select. Selecting too many ones causes additional overhead (which
might be unnecessary), selecting too few ones may cause problems
for the applications. The extension Handle Resolution Option --
defined in [12] -- provides a possibility for the PU to specify
the amount of PEs to be selected. This possibility should be
integrated into ASAP.
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o RSerPool defines SCTP (defined in [10]) as transport protocol for
RSerPool. TCP and particularly Multi-Path TCP (MPTCP; see [11])
should be possible further transport protocols for all RSerPool
traffic. SCTP should still be the recommended choice, but
allowing TCP/MPTCP could make the deployment much easier. (SCTP
is superior, but it lacks of support in operating systems and
support by underlying network infrastructure, like firewalls and
middleboxes.)
2.1. Security Considerations
Security considerations for RSerPool can be found in [6].
2.2. IANA Considerations
This document introduces no additional considerations for IANA.
3. Reference Implementation
The RSerPool reference implementation RSPLIB, including example
applications, can be found at [22]. It supports the functionalities
defined by [2], [3], [4], [5] and [6] as well as the options [12],
[14] and [13]. An introduction to this implementation is provided in
[16].
4. Testbed Platform
NorNet is a large-scale and realistic Internet testbed platform with
support for Reliable Server Pooling as well as the underlying
transport protocols SCTP and MPTCP. A description of and
introduction to NorNet is provided in [19], [20], [21]. Further
information can be found on the project website [23].
5. Acknowledgments
The author would like to thank Randall R. Stewart, Michael Tuexen,
Ning Zong for their discussions and support.
6. References
6.1. Normative References
[1] Tuexen, M., Xie, Q., Stewart, R., Shore, M., Ong, L.,
Loughney, J., and M. Stillman, "Requirements for Reliable
Server Pooling", RFC 3237, DOI 10.17487/RFC3237, January
2002, <https://www.rfc-editor.org/info/rfc3237>.
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[2] Lei, P., Ong, L., Tuexen, M., and T. Dreibholz, "An
Overview of Reliable Server Pooling Protocols", RFC 5351,
DOI 10.17487/RFC5351, September 2008,
<https://www.rfc-editor.org/info/rfc5351>.
[3] Stewart, R., Xie, Q., Stillman, M., and M. Tuexen,
"Aggregate Server Access Protocol (ASAP)", RFC 5352,
DOI 10.17487/RFC5352, September 2008,
<https://www.rfc-editor.org/info/rfc5352>.
[4] Xie, Q., Stewart, R., Stillman, M., Tuexen, M., and A.
Silverton, "Endpoint Handlespace Redundancy Protocol
(ENRP)", RFC 5353, DOI 10.17487/RFC5353, September 2008,
<https://www.rfc-editor.org/info/rfc5353>.
[5] 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,
<https://www.rfc-editor.org/info/rfc5354>.
[6] 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, <https://www.rfc-editor.org/info/rfc5355>.
[7] Dreibholz, T. and M. Tuexen, "Reliable Server Pooling
Policies", RFC 5356, DOI 10.17487/RFC5356, September 2008,
<https://www.rfc-editor.org/info/rfc5356>.
[8] Dreibholz, T. and J. Mulik, "Reliable Server Pooling MIB
Module Definition", RFC 5525, DOI 10.17487/RFC5525, April
2009, <https://www.rfc-editor.org/info/rfc5525>.
[9] Braden, R., Borman, D., and C. Partridge, "Computing the
Internet checksum", RFC 1071, DOI 10.17487/RFC1071,
September 1988, <https://www.rfc-editor.org/info/rfc1071>.
[10] Stewart, R., Ed., "Stream Control Transmission Protocol",
RFC 4960, DOI 10.17487/RFC4960, September 2007,
<https://www.rfc-editor.org/info/rfc4960>.
[11] Ford, A., Raiciu, C., Handley, M., and O. Bonaventure,
"TCP Extensions for Multipath Operation with Multiple
Addresses", RFC 6824, DOI 10.17487/RFC6824, January 2013,
<https://www.rfc-editor.org/info/rfc6824>.
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[12] Dreibholz, T., "Handle Resolution Option for ASAP", draft-
dreibholz-rserpool-asap-hropt-27 (work in progress),
September 2020.
[13] 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-26 (work in progress), September 2020.
[14] Dreibholz, T. and X. Zhou, "Takeover Suggestion Flag for
the ENRP Handle Update Message", draft-dreibholz-rserpool-
enrp-takeover-24 (work in progress), September 2020.
[15] Zong, N., Dunbar, L., Shore, M., Lopez, D., and G.
Karagiannis, "Virtualized Network Function (VNF) Pool
Problem Statement", draft-zong-vnfpool-problem-
statement-06 (work in progress), July 2014.
6.2. Informative References
[16] 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>.
[17] Dreibholz, T. and E. Rathgeb, "A Powerful Tool-Chain for
Setup, Distributed Processing, Analysis and Debugging of
OMNeT++ Simulations", Proceedings of the 1st ACM/ICST
International Workshop on OMNeT++ ISBN 978-963-9799-20-2,
DOI 10.4108/ICST.SIMUTOOLS2008.2990, March 2008,
<https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
TDR/ReliableServer/Publications/OMNeTWorkshop2008.pdf>.
[18] Dreibholz, T., "Evaluation and Optimisation of Multi-Path
Transport using the Stream Control Transmission
Protocol", Habilitation Treatise, March 2012,
<https://duepublico.uni-duisburg-
essen.de/servlets/DerivateServlet/Derivate-29737/
Dre2012_final.pdf>.
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[19] 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/file/
threfereedinproceedingsreference2012-12-207643198512pdf/
download>.
[20] Dreibholz, T., "The NorNet Core Testbed - Introduction and
Status", Proceedings of the 1st International NorNet
Users Workshop (NNUW-1), September 2013,
<https://www.simula.no/file/simulasimula2124pdf/download>.
[21] Dreibholz, T., "The NorNet Core Testbed - An Experiment
Tutorial", Proceedings of the 1st International NorNet
Users Workshop (NNUW-1), September 2013,
<https://www.simula.no/file/simulasimula2130pdf/download>.
[22] Dreibholz, T., "Thomas Dreibholz's RSerPool Page",
Online: https://www.uni-due.de/~be0001/rserpool/, 2019,
<https://www.uni-due.de/~be0001/rserpool/>.
[23] Dreibholz, T., "NorNet - A Real-World, Large-Scale Multi-
Homing Testbed", Online: https://www.nntb.no/, 2019,
<https://www.nntb.no/>.
Author's Address
Thomas Dreibholz
Simula Metropolitan Centre for Digital Engineering
Pilestredet 52
0167 Oslo, Oslo
Norway
Phone: +47-6782-8200
Fax: +47-6782-8201
Email: dreibh@simula.no
URI: https://www.simula.no/people/dreibh
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