Marcus Brunner wrote:
>
> Carlos Alberto Kamienski wrote:
> >
> > I my opinion there should be a field in the SLS for specifying exactly the
> > service one has in mind. It may be a well-known service identifier or a
> > identifier that has just a peer-to-peer meaning. I cannot see a
> > negociation process where both sides are able to understand clearly other
> > side's idea of the service just by observing some fields in the SLS (for
> > any service one can ever imagine!).
>
> You are right, this makes it much easier for negotiation. On the other
> hand, have you well-known services in mind? The only "service" the
> DiffServ WG (they call it PDB) is currently looking at is the Virtual
> Leased Line (VLL). It uses the EF PDB in the network.
>
> But never the less, the well-known service needs to be specified with a
> SLS. So in my opinion the well-known service identifer is just a
> compression of the SLS for ease of negotiation.
>
> Marcus
Dear Marcus, dear all,
in a running project (AQUILA, see
http://www-st.inf.tu-dresden.de/aquila/)
we are defining (and implementing!) SLSs in a way which is very similar
to the approach defined in draft-tequila-diffserv-sls-00.txt.
What is interesting is that we found the need to have pre-defined
SLSs (we called it "Network Services" but the name can be misleading):
for ease of negotiation and implementation only a subset
of parameters can be specified, while the others are given by default
with reference to a small set of "well known services".
This is in perfect agreement with your idea that a well-known service
identifer is just a compression of the SLS for ease of negotiation.
We plan to send a contribution to this discussion with a draft
document in a short time (one or two weeks) to present our approach.
Best regards,
Stefano
--
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Stefano Salsano
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
E-mail : salsano@coritel.it URL : http://www.coritel.it
Tel. : +39 06 20410029 Address : Via di Tor Vergata, 135
Fax. : +39 06 20410037 00133 Roma - ITALY
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