The point is that when a packet crosses an administrative domain boundary,
the downstream ISP typically wants to reclassify the packet all over again,
i.e. does not accept the incoming DSCP as definitive. This was a very
clearly stated ISP requirement at the start of diffserv and is fundamental
in the diffserv architecture.
Brian
Michael Thomas wrote:
>
> Brian E Carpenter writes:
> > Thomas,
> >
> > The diffserv issue is that diffserv currently cannot properly classify packets
> > that are hidden by ESP headers. If it wasn't for that, I personally wouldn't
> > have gone near the flow label.
>
> Huh? I thought that one of the requirements for ESP was to
> copy the DSCP to the outer header. If I recall correctly,
> this bothers some people from a traffic analysis standpoint,
> but that seems to be part and parcel with QoS so that doesn't
> hold much water IMO.
>
> Mike
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