Re: SUA: CLDT: RC Parameter

Ilie,

In IPSP-SE model there is only one AS.

I think that you are trying to run two IPSP-DE nodes like SE.

Two AS's never communicate with each other directly, only via SGP
or SGPF, and even then, one AS is not aware whether another is an
AS or a regular SS7 node.

--brian

Ilie Glib wrote:                              (Wed, 31 May 2006 20:44:57)
> Hello Brian, May,
> 
> I think, in case of IPSP to IPSP model, there are two ASes (AS1 and
> AS2), one at each side. For SE-IPSP implies activation of both ASes
> via one ACTIVE message, the RC exchanged in the ACTIVE message shall
> identify both ASes. Consequently RC1 = RC2. Since RC values are
> allocated by SGPF, SGPF shall assign RC values consistently. Probably
> the only feasible way to assign RCs is by provisioning for SE model.
> 
> I have some doubts about the case when an IPSP serves multiple ASes
> and SE-IPSP model is in use. Is this situation possible, can AS1 talk
> to AS3 and AS4
> 
> IPSP1 ----------------------------- IPSP2
> 
> AS1 <---------------------------------> AS3
>                             |
> AS2                     --------------> AS4
> 
> 
> How can AS4 go inactive, while AS3 be active in SE model?
> 
> Thank you in advance
> 
> Ilie
> 
> On 5/31/06, Brian F. G. Bidulock <[email protected]> wrote:
> > Hi Howard,
> >
> > Please see comments below...
> >
> > May, Howard wrote:                            (Wed, 31 May 2006 10:53:12)
> > > Hi,
> > >
> > > The RC parameter is mandatory in CLDT messages.  Please can you check my
> > > understanding of how this parameter should be used in the three
> > > following situations.
> > >
> > > When a CLDT is sent from an SGP to an ASP the value this parameter
> > > should be set to is the RC of the AS the message is for.  The ASP may
> > > use this parameter for local distribution of the message.
> >
> > Yes.
> >
> > >
> > > When a CLDT is sent from an ASP to an SGP the value this parameter
> > > should be set to is the RC of the AS the message is from.  The SGP may
> > > use this parameter to determine the Network Context applicable to the
> > > CLDT.
> >
> > Yes, and any other restrictions or permissions that might be associated
> > with the AS at the SGP (such as calling party address).
> >
> > >
> > > When a CLDT is sent from an IPSP to an IPSP the value this parameter
> > > should be set to is the RC of the AS the message is for.  The IPSP may
> > > use this parameter for local distribution of the message.
> >
> > For SE-IPSP, the AS the message is for and the AS the message is from are
> > the same.  For DE-IPSP, because messages are essentially sent from the SGPF
> > to the ASPF in the criss-cross model, the AS is the As that the message is
> > for just as in the SGP->ASP case above.
> >
> > --brian
> >
> > --
> > Brian F. G. Bidulock
> > [email protected]
> > http://www.openss7.org/
> >
> > _______________________________________________
> > Sigtran mailing list
> > [email protected]
> > https://www1.ietf.org/mailman/listinfo/sigtran
> >
> 
> 
> -- 
> Ilie

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