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-03.txt
Pages : 10
Date : 2011-12-15
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.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-shen-soc-avalanche-restart-overload-03.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-shen-soc-avalanche-restart-overload-03.txt
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