RE: M3UA notify message

Brian,

> -----Original Message-----
> From: Brian F. G. Bidulock [mailto:[email protected]]
> Sent: Friday, February 24, 2006 5:52 PM
> To: Tolga Asveren
> Cc: [email protected]
> Subject: Re: [Sigtran] M3UA notify message
>
>
> Tolga,
>
>
> Tolga Asveren wrote:
>    (Fri, 24 Feb 2006 16:55:17)
> > [TOLGA]Several points:
> > a)Internal message routing between SGPs won't buy you lossless
> failover if
> > SCTP association is down (one will loose some of the sent but
> unacknowledged
> > messages)-but yes it is a good thing, when did I say that one
> shouldn't have
> > it?-
>
> Message loss is far better than complete service outage.
[TOLGA]Did I say otherwise? I don't understand how you started to speak
about this internal routing issue at all. We are discussing the benefits of
SCTP multihoming. Using SCTP multihoming does not mean that one shouldn't
have internal message routing, they are not mutually exclusive I repeat what
I said, internal routing is a nice thing to have.
>
> > b)A properly designed network core has several mechanisms to deal with
> > failovers in a proper way. A few of the mechanisms described in 3.3 in
> >
> http://www.ietf.org/internet-drafts/draft-asveren-sigtran-m3uacons-00.txt
> > can be used for this purpose, and *are* actually used.
>
> Now you presume to tell others how to "properly" design their networks?
>
> An operator does not necessarily (and does not usually) have
> design control
> over all the networks that they use for transport, particularly
> in the Big I
> to which M3UA is applicable.
[TOLGA]I don't think people will deploy SIGTRAN in big-I Internet. That
people are not in control of the core network does not mean that they can
buy the QoS/VPN between two points they want.
>
> > c)If you can't provide a properly engineered IP network, you still can
> > deploy M3UA, you just need to keep the expectations about
> redundancy low,
> > and for certain cases that could be totally fine.
>
> With AS/ASP state coordination, an operator does not need to
> require that all
> the networks that it traverses be engineered to your content, and will yet
> experience higher redundancy at lower cost than your non-AS/ASP
> coordination
> approach.
[TOLGA]I repeat again, internal routing is important but not enough for real
carrier grade deployment, but of course people are free to use the toplogy
they want.
>
> --brian
>
> --
> Brian F. G. Bidulock
> [email protected]
> http://www.openss7.org/
>