Re: [Diffserv] "Critical" traffic in a DS Domain

Of course it's not just the DSCPs that matter, it's the end-to-end 
service (here we go again :-)).  The class selectors promise nothing 
about loss or delay, except in relative terms.  If you want to be sure of 
zero delay, zero loss, you need a service which provides that -- which 
you could implement with class selectors 6 and 7, or EF or AF.  You're 
feeding right into the per-domain behavior discussion that's been going 
on (see draft-ietf-diffserv-ba-def-01.txt).

At 11:16 05/03/2000 -0500, Brian E Carpenter wrote:
>Class Selector 6 or 7 (RFC 2474, section 4.2.2.2)
>
>     Brian
>
>"Wilson, Greg" wrote:
> >
> > All-
> >
> > What would be the best DS configuration for data that falls into a
> > "critical" category.  IE:  Network Control Traffic, Heartbeats, Error
> > Messages, or any other kind of data that directly controls the primary
> > functionality of a far-end, time sensitive device that is connected 
> to the
> > network.  This kind of traffic, if delayed or dropped, can cause 
> problems or
> > perceived problems with the affected devices.
> >
> > I am looking to find a PHB that focuses on this kind of "critical" 
> traffic.
> >
> > Thanks
> > -Greg Wilson
> > gwilson@necam.com

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