Re: 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.

--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/