RE: Recommendation for SUA modifications

Tolga,

I agree with you.  There are many scenarios where it is not a good idea
to shutoff all data flow between ASP and SG.  We want to shut off or
reduce peer to peer data messages associated with a specific ASP.  Only
a peer-to-peer message will handle that scenario.

Regards,
Lincoln 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Tolga Asveren
Sent: Friday, October 14, 2005 11:02 AM
To: [email protected]
Subject: RE: [Sigtran] Recommendation for SUA modifications

Brian,

As far as I can see, SCTP congestion may not be good enough for cases:
a)Where there are I/O bound operations on ASP as part of application
logic -depending on latency on I/O operation, application can declare
itself congested, rather than waiting SCTP to detect it- b)If ASP-M3UA
and ASP-Service Logic are on different hosts/cards/blades etc..

For both of those cases, congestion will probably propogate down to the
SCTP level eventually, but it can be detected and SG can take proper
action earlier. Actually I believe even for the generic case,
application can detect congestion earlier than SCTP for most of the
situations and I think to have the option to communicate this as early
as possible is a nice thing to have.

    Thanks,
    Tolga

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Brian F. G. Bidulock
> Sent: Friday, October 14, 2005 10:46 AM
> To: Tolga Asveren
> Cc: [email protected]; [email protected]; [email protected]
> Subject: Re: [Sigtran] Recommendation for SUA modifications
>
>
> Tolga,
>
> What were the scenarios where SCTP flow control (arwnd) do not work?
>
> Could you detail them?
>
> I would like to capture them in my congestion draft.
>
> --brian
>
> Tolga Asveren wrote:                            (Fri, 14 Oct 2005
> 09:34:42)
> > Brian,
> >
> > On the big picture I agree with you that SSNM is meant to be
> used for SS7
> > network management, hence SCON is supposed to be used for SS7 
> > congestion procedures. OTOH, there is a need to notify congestion 
> > status
> of ASPs to SG
> > and right now it seems like we don't have a solution -actually
> till now the
> > supposed solution was relying on SCTP congestion but there are 
> > scenarios where this is not enough/does not work well-. I believe
> something needs to
> > be done to address that issue.
> > a)Either a new ASPTM
> > b) or overloading SCON
> >
> >     Thanks,
> >     Tolga
> >
>
> --
> Brian F. G. Bidulock
> [email protected]
> http://www.openss7.org/
>
> _______________________________________________
> Sigtran mailing list
> [email protected]
> https://www1.ietf.org/mailman/listinfo/sigtran
>



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