A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : A Mechanism for Session Initiation Protocol (SIP)
Avalanche Restart Overload Control
Author(s) : Charles Shen
Henning Schulzrinne
Arata Koike
Filename : draft-shen-soc-avalanche-restart-overload-06.txt
Pages : 9
Date : 2013-08-10
Abstract:
When a large number of clients register with a SIP registrar server
at approximately the same time, the server may become overloaded.
Near-simultaneous floods of SIP SUBSCRIBE and PUBLISH requests may
have similar effects. Such request avalanches can occur, for
example, after a power failure and recovery in a metropolitan area.
This document describes how to avoid such overload situations. Under
this mechanism, a server estimates an avalanche restart backoff
interval during its normal operation and conveys this interval to its
clients through a new Restart-Timer header in normal response
messages. Once an avalanche restart actually occurs, the clients
perform backoff based on the previously received Restart-Timer header
value before sending out the first request attempt. Thus, the
mechanism spreads all the initial client requests and prevents them
from overloading the server.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-shen-soc-avalanche-restart-overload
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-shen-soc-avalanche-restart-overload-06
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-shen-soc-avalanche-restart-overload-06
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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