Re: Sigtran extension for network management and association changeover.

Xiangsong,

Xiangsong Cui wrote:                      (Thu, 04 Mar 2010 11:48:15)
> 
> http://tools.ietf.org/id/draft-cui-tsvwg-snm-ps-00.txt
> Abstract: 
>   Sigtran is widely applied in the telecommunication network but there 
>   are still some issues. This document briefly describes some concerned 
>   scenarios and presents the association changeover and Sigtran routing 
>   management problems. The goal of this document is to analyse the 
>   existing shortage of Sigtran and discuss the desirable improvements. 

I believe these issues were already addressed in the 3GPP Liaison
statement of April 2008.  Note that 3GPP (which you cite in the
document) does not permit M3UA RK's at granularity of less than
a signalling point code.

> 
> http://tools.ietf.org/id/draft-cui-tsvwg-assoc-changeover-00.txt
> Abstract:
>   Sigtran specifies association-level reliable transport for signaling 
>   using SCTP, but in some scenarios a single association failure's 
>   reliability mechanism is not sufficient to achieve telco reliability. 
>   This document specifies procedures for an SCTP association changeover 
>   solution which will enable applications to meet a higher degree of 
>   availability. Two generic changeover solutions are presented in this 
>   document. One is implemented inside the SCTP protocol stack and the 
>   other requires SCTP and ULP to work in collaboration. 

http://tools.ietf.org/html/draft-bidulock-sigtran-corid-05 provides
several mechanisms that are completely local and accomplish this
without protocol changes: neither in SCTP nor the UA.  UAs, such as
M3UA, provide CorrelationId/Ack, BEAT/Ack, and ASPTM on data streams
that already accommodate these procedures.

--brian

-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/