Re: [tequila/sls] comments on the TEQUILA draft by W. Almesberger

From: Marcus Brunner (brunner@ccrle.nec.de)
Date: Tue Oct 17 2000 - 10:36:17 CEST

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    Carlos Alberto Kamienski wrote:
    >
    > > > Carlos, Yves,
    > > >
    > > > In the context of the draft, the DSCP is a mean for a flow
    > > > specification. If it is signalled by the network, it is specified in the
    > > > offer from the network. The DSCP specifed in the SLS draft has in my
    > > > understanding nothing to do with the DSCP the packets are market in the
    > > > network. But it can be used for the traffic specification.
    > > >
    > >
    > > totally correct. DSCPs at the ingress link are just another way of
    > > indicating a to be differentiated flow.
    > > cheers
    > > Yves
    >
    > Why use the same name for a different think if this work is beginning from
    > scratch ? (there are no historical reasons for it).
    > Is it not a misuse, since the acronym DSCP has been defined by the
    > diffserv wg ?

    Yes, DSCP is defined by the DiffServ WG, but it is a IP header field
    previously named ToS field. If you like, we can also talk about the ToS
    field. If the service requester already has a DiffServ network, he wants
    to negotiate a service based on a set of ToS/DSCP fields.

    >
    > 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

    >
    > Regards,
    >
    > Carlos 

    -- 

    Dr. Marcus Brunner
C&C Research Laboratories
NEC Europe Ltd.

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