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.
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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