Re: SP Status double endpoint

"Brian F. G. Bidulock" <[email protected]> Wed, 22 Aug 2007 04:20:45 -0600

Newsgroups	gmane.ietf.sigtran
Organization	http://www.openss7.org/
Message-ID	<[email protected]>

chen.puran,

[email protected] wrote:                      (Wed, 22 Aug 2007 08:59:12)
> thanks£¬brain
> 
> but£¬because of a distributed software system & Client/server Mode,When
> Server change The ASP Status
> 
> unexpectedly,it(RFC4666) can not inform Client to Change SP Status in the
> same way or Restore to correct Status.
> 
> it may cause Server to be In DOWN/INACTIVE ,Client to be In ACTIVE,And Can
> not restore to correctly Status.

Oh, yes it can: the unsolicited ASP-INACTIVE-ACK and unsolicited ASP-DOWN-ACK
procedures.  The SGP sends ASP-INACTIVE-ACK to push the ASP to the inactive
state for an AS and ASP-DOWN-ACK to push an ASP down.
> 
> maybe,SCTP is reliable,but interface between M3UA and SCTP is not.
> MTP3 have change and change back ,it is maybe more reliable than M3UA.

SCTP does not misorder messages delivered to the User, MTP does.  SCTP does
not drop messages in the middle, MTP does.

> 
> so,i think check every ASP STATUS in AS is very necessary,and in fact,we
> have encounter the ASP Status ERROR.

Not necessary.

--brian

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