RE: RFC 4666 M3UA - Reg Request Message

Brian,

Let me see if I understand correctly.  You are saying that we can
distribute load within an AS using LOADSEL.  Does this imply that all
CICs are covered.

For example, if the SG is receiving messages from OPC1 for CICs 1-3200
and OPC2 for CICs 1-3200, then there must be an AS that handles all of
these incoming IAMs.  Or, are you saying the SG has no ISUP knowledge,
and it is just looking at the CIC value and perhaps distributing load to
the AS that is registered to receive traffic from OPC1 for example.

Regards,
Lincoln


-----Original Message-----
From: Brian F. G. Bidulock [mailto:[email protected]] 
Sent: Monday, November 06, 2006 2:52 PM
To: Haresign Lincoln
Cc: Barry Nagelberg; [email protected]
Subject: Re: [Sigtran] RFC 4666 M3UA - Reg Request Message

Lincoln,

The LOADSEL draft provides just such a failover mechanism.

The SS7 network does not route on CIC, it performs load sharing of
messages over SS7 links based on SLS (which is part of the CIC).

ETSI TS 102 142 properly asserts that RKs should be no less than a Point
Code (with the exception that in ANSI networks where Alias point codes
are used per ANSI T1.113/2000 for the GTT function, distribution on SI
value is suitable).

In fact, all such CIC schemes are load sharing and not routing.
What is lacking in the M3UA RFCs (both of them) is the ASPs inability to
control the load selection algorithm to effect efficient call state
sharing and management.  The LOADSEL draft provides just such a
mechanism for CIC and the LOADGRP draft provide another level of
sophistication on the same load selector.

In your failover scenario, under LOADGRP it is even possible for the
ASPs to specify to which alternate ASP a given load selection fails over
to.  For both LOADSEL and LOADGRP, the SG does not need to understand
ISUP to perform its function, yet the ASPs have complete control over
management of call state by specifying to which ASPs the SG sends which
messages.

--brian

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