Re: Optional ASP-ID in M3UA

"Brian F. G. Bidulock" <[email protected]> Wed, 12 Mar 2008 01:02:45 -0600

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

Ambika,

Ambika Tripathy wrote:                   (Wed, 12 Mar 2008 12:19:33)
> 
>    Why there is ASPID in protocol and what is need then?

1. Two ASPs are implemetned, each as a separate process on the same host.
   Each connects to the same SGP using dynamic port allocation (e.g. binds
   to port 0).  The SGP cannot distinguish between them based on IP addresses
   (which are the same) nor port number (of which the SGP has no a priori
   knowledge).  In such a case the SGP can require an ASP-ID.

2. Four ASPs serve an AS, e.g. in loadshare mode.  The SG reports ASP
   failure in the AS.  The ASPs cannot know for certain to which ASP
   the SG refers unless they provide ASP-ID with ASP-UP.  Therefore, when
   the ASP provides ASP-ID in ASP-UP, the SG must store the value and use
   it when reporting ASP Failure in a NOTIFY message.

But both these situations are mentioned in the RFC.

--brian

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