Reliable Server Pooling Policies
RFC 5356
Network Working Group T. Dreibholz
Request for Comments: 5356 University of Duisburg-Essen
Category: Experimental M. Tuexen
Muenster Univ. of Applied Sciences
September 2008
Reliable Server Pooling Policies
Status of This Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Abstract
This document describes server pool policies for Reliable Server
Pooling (RSerPool) including considerations for implementing them at
Endpoint Handlespace Redundancy Protocol (ENRP) servers and pool
users.
Table of Contents
1. Introduction ....................................................3
2. Conventions .....................................................3
3. Terminology and Definitions .....................................3
3.1. Load .......................................................3
3.2. Weight .....................................................3
4. Non-Adaptive Policies ...........................................4
4.1. Round Robin Policy .........................................4
4.1.1. Description .........................................4
4.1.2. ENRP Server Considerations ..........................4
4.1.3. Pool User Considerations ............................4
4.1.4. Pool Member Selection Policy Parameter ..............4
4.2. Weighted Round Robin Policy ................................5
4.2.1. Description .........................................5
4.2.2. ENRP Server Considerations ..........................5
4.2.3. Pool User Considerations ............................5
4.2.4. Pool Member Selection Policy Parameter ..............5
4.3. Random Policy ..............................................5
4.3.1. Description .........................................5
4.3.2. ENRP Server Considerations ..........................6
4.3.3. Pool User Considerations ............................6
4.3.4. Pool Member Selection Policy Parameter ..............6
4.4. Weighted Random Policy .....................................6
4.4.1. Description .........................................6
Dreibholz & Tuexen Experimental [Page 1]
RFC 5356 RSerPool Policies September 2008
4.4.2. ENRP Server Considerations ..........................6
4.4.3. Pool User Considerations ............................6
4.4.4. Pool Member Selection Policy Parameter ..............7
4.5. Priority Policy ............................................7
4.5.1. Description .........................................7
4.5.2. ENRP Server Considerations ..........................7
4.5.3. Pool Element Considerations .........................7
4.5.4. Pool Member Selection Policy Parameter ..............7
5. Adaptive Policies ...............................................8
5.1. Least Used Policy ..........................................8
5.1.1. Description .........................................8
5.1.2. ENRP Server Considerations ..........................8
5.1.3. Pool User Considerations ............................8
5.1.4. Pool Member Selection Policy Parameter ..............8
5.2. Least Used with Degradation Policy .........................9
5.2.1. Description .........................................9
5.2.2. ENRP Server Considerations ..........................9
5.2.3. Pool User Considerations ............................9
5.2.4. Pool Member Selection Policy Parameter ..............9
5.3. Priority Least Used Policy ................................10
5.3.1. Description ........................................10
5.3.2. ENRP Server Considerations .........................10
5.3.3. Pool User Considerations ...........................10
5.3.4. Pool Member Selection Policy Parameter .............10
5.4. Randomized Least Used Policy ..............................11
5.4.1. Description ........................................11
5.4.2. ENRP Server Considerations .........................11
5.4.3. Pool User Considerations ...........................11
5.4.4. Pool Member Selection Policy Parameter .............11
6. Security Considerations ........................................11
7. IANA Considerations ............................................12
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