Takeover Suggestion Flag for the ENRP Handle Update Message
draft-dreibholz-rserpool-enrp-takeover-24
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Network Working Group T. Dreibholz
Internet-Draft SimulaMet
Intended status: Experimental X. Zhou
Expires: March 13, 2021 Hainan University
September 09, 2020
Takeover Suggestion Flag for the ENRP Handle Update Message
draft-dreibholz-rserpool-enrp-takeover-24
Abstract
This document describes the Takeover Suggestion Flag for the
ENRP_HANDLE_UPDATE message of the ENRP protocol.
Status of This Memo
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This Internet-Draft will expire on March 13, 2021.
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Copyright (c) 2020 IETF Trust and the persons identified as the
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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. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
1.3. Conventions . . . . . . . . . . . . . . . . . . . . . . . 3
2. Takeover Suggestion Flag . . . . . . . . . . . . . . . . . . 3
2.1. Definition . . . . . . . . . . . . . . . . . . . . . . . 3
3. Reference Implementation . . . . . . . . . . . . . . . . . . 4
4. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
7.1. Normative References . . . . . . . . . . . . . . . . . . 4
7.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
Reliable Server Pooling as described in [RFC5351] defines protocols
for providing highly available services. The management component
used for pool administration is denoted as ENRP Server or Pool
Registrar (PR). Since a single ENRP server constitutes a single
point of failure, there must be multiple ENRP servers. Servers,
denoted as Pool Elements (PE), use an arbitrary ENRP server for
registration into the pool. The chosen ENRP server becomes the Home
ENRP Server, also denoted as Home PR (PR-H), of the PE. It is
responsible for making the PE identity known to the other ENRP
servers (by using ENRP_HANDLE_UPDATE messages) and also to monitor
the PE health (by using keep-alive messages).
As shown in [AINA2009], the following scenario leads to unbalanced
ENRP server workload: consider a set of multiple ENRP servers with
one subset being unreliable (for example, their network connection
has problems) and some reliable ENRP servers. After a while, the
reliable ENRP server will get the home ENRP server role for almost
all of the PEs, which results in high workload for this ENRP server.
Since the home ENRP server role is more computation-intensive (as
shown by [IJHIT2008]), this leads to highly unbalanced workload for
large RSerPool setups. This unbalanced workload remains, even when
the unreliable ENRP servers become reliable again (for example, when
the network problems have been solved).
1.1. Scope
The Takeover Suggestion Flag defined in this draft defines a flag for
the ENRP_HANDLE_UPDATE message. If the flag is set, the receiving
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