You missed my point: the Diffserv field is used for QoS flow aggregation
and not packet forwarding.
Alex
Michael Thomas wrote:
>
> Alex Conta writes:
> > If flow IDs are used for fast forwarding, without the ability to rewrite
> > them, it seems to me
> > that a router will not be able to aggregate flows.
>
> Boy, I may be missing something really stupid, but
> the DSCP seems like the obvious flow aggregation
> handle to me.
>
> Mike
> >
> > Alex
> >
> >
> > Michael Thomas wrote:
> > >
> > > Francis Dupont writes:
> > > > In your previous mail you wrote:
> > > >
> > > > flow label field is not part of AH calculation, but as RSVP already
> > > > requires it to be end-to-end (not hop-by-hop) i think we shouldn't
> > > > rewrite it in transit.
> > > >
> > > > => I don't read your argument as you. I'll say it should not be rewritten
> > > > in transit if RSVP is in use. A DiffServ edge router can rewrite it
> > > > in some situation (it is supposed to know what is RSVP and do the right
> > > > thing).
> > >
> > > Why would a diffserv router _want_ to rewrite a flow label?
> > > It can still rewrite the DSCP if it wants. The only thing
> > > that I've seen mentioned that could actually take advantage
> > > in the way you are mentioning is using the flow label for
> > > MPLS label swapping bits.
> > >
> > > Mike
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