Michael Thomas wrote:
>
> Brian E Carpenter writes:
> > Jim,
> >
> > It still isn't clear to me what the flow label adds to the semantics
> > used by existing 5-tuple QOS classifiers.
>
> It seems intuitively more efficient for a flow classifier
> to use a single host-defined flow identifier than having
> to walk a potentially long list of extension headers.
> Another advantage is that, sort of like diffserv, the
> host itself can decide what is to be grouped in a particular
> flow instead of requiring that it match the normal 5-tuple.
Just to make the point again: the 5-tuple has semantics that
allows a classifier to *classify* the traffic. Today at least,
the flow label has no such semantics - it's just plain bits.
That may help in IntServ but it's no use at all in DiffServ.
Brian
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