RFC 3385 (rfc3385) - Page 1 of 23
Internet Protocol Small Computer System Interface (iSCSI) Cyclic Redundancy Check (CRC)/Checksum Considerations
Alternative Format: Original Text Document
Network Working Group D. Sheinwald
Request for Comments: 3385 J. Satran
Category: Informational IBM
P. Thaler
V. Cavanna
Agilent
September 2002
Internet Protocol Small Computer System Interface (iSCSI)
Cyclic Redundancy Check (CRC)/Checksum Considerations
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
In this memo, we attempt to give some estimates for the probability
of undetected errors to facilitate the selection of an error
detection code for the Internet Protocol Small Computer System
Interface (iSCSI).
We will also attempt to compare Cyclic Redundancy Checks (CRCs) with
other checksum forms (e.g., Fletcher, Adler, weighted checksums), as
permitted by available data.
1. Introduction
Cyclic Redundancy Check (CRC) codes [Peterson] are shortened cyclic
codes used for error detection. A number of CRC codes have been
adopted in standards: ATM, IEC, IEEE, CCITT, IBM-SDLC, and more
[Baicheva]. The most important expectation from this kind of code is
a very low probability for undetected errors. The probability of
undetected errors in such codes has been, and still is, subject to
extensive studies that have included both analytical models and
simulations. Those codes have been used extensively in
communications and magnetic recording as they demonstrate good "burst
error" detection capabilities, but are also good at detecting several
independent bit errors. Hardware implementations are very simple and
well known; their simplicity has made them popular with hardware
Sheinwald, et. al. Informational