RE: AS concepts and Relay in SUA and M3UA

Brian,

> -----Original Message-----
> From: Brian F. G. Bidulock [mailto:[email protected]]
> Sent: Friday, December 16, 2005 2:38 PM
> To: Tolga Asveren
> Cc: [email protected]
> Subject: Re: [Sigtran] AS concepts and Relay in SUA and M3UA
> 
> 
> Tolga,
> 
> SCCP also supports relay from SCCP-User to SCCP-User.  An SUA IPSP
> must also support this, regardless of where you think it is
> functionally situated.
[TOLGA]Do you mean relaying between two local SCCP-Users?
> 
> --brian
> 
> Tolga Asveren wrote:                                              
>    (Fri, 16 Dec 2005 13:46:48)
> > Brian,
> > 
> > > -----Original Message-----
> > > From: Brian F. G. Bidulock [mailto:[email protected]]
> > > Sent: Friday, December 16, 2005 1:52 PM
> > > To: Tolga Asveren
> > > Cc: SIGTRAN
> > > Subject: Re: [Sigtran] AS concepts and Relay in SUA and M3UA
> > >
> > >
> > > Tolga,
> > >
> > > Well, no.  Unlike MTP, where the transfer function is only optionally
> > > equipped at specific interior nodes in the network (STPs), SCCP relay
> > > is possible at all nodes in the network (including 
> endpoints).  Therefore
> > > M3UA can treat the network as point to point (i.e. like all 
> F-links with
> > > no STPs) but SUA cannot treat the network as having no relay points.
> > [TOLGA]Yes, I agree that SCCP itself has transfer capability, 
> but SUA-IPSP
> > does not have SCCP layer, it just provides the same interface 
> as SCCP to its
> > users. I don't think that SUA MUST support relaying can be concluded
> > directly from the transport functionality of SCCP. OTOH, I agree that
> > relaying is a useful concept even in IP-transport case from
> > management/maintenence etc... point of view, both for SUA and M3UA.
> > >
> > > Therefore, SUA IPSPs must support relay to support SCCP-Users.
> > [TOLGA]I believe for SUA, all the relationship between SUA-Relay and
> > SUA-IPSP should be thought/defined carefully. My point of view 
> is that SUA
> > IPSP does not support relaying. There is no SCCP layer in an 
> SUA-IPSP, OTOH
> > a SUA-SG has SCCP layer. My undertsanding is:
> > SUA-Relay ==> SG-SG for SUA (based on SCCP constructs), 
> supports relaying.
> > SUA-IPSP ==> Direct communication between two SUA users, does 
> not support
> > relaying.
> > 
> > Let me reiterate that this is just my own understanding ;-)
> > 
> 
> -- 
> Brian F. G. Bidulock
> [email protected]
> http://www.openss7.org/
>