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) : C. Shen, et al.
Filename : draft-shen-sipping-avalanche-restart-overload-00.txt
Pages : 10
Date : 2009-11-20
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 Register-Restart header in registration
responses. Once an avalanche restart actually occurs, the clients
perform backoff based on the previously received Register-Restart
header value before sending out the first registration attempt.
Thus, the mechanism spreads all the initial client registration
requests and prevents them from overloading the registrar server.
Status of this Memo
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