Re: [ns] simulation EF PHB in nortel diffserv

[Sudhindra Suresh Bengeri <ssbenger@unity.ncsu.edu>]

Well the manual does not specifically mention how EF PHB coulb be
simulated. However I feel EF PHB can be simulated by having one Queue(0)
with only one precedence and setting the MRED mode to DROP

$dsredq setMREDMode DROP 0

the other queues can be used for AF or BE traffic.

could you please comment if I am right.

Thanks,
Sudhin.

On Wed, 4 Apr 2001, Xuan Chen wrote:

> I think EF is supported by nortel's implementations. You may find the
> documentation on their as well as the chapter on diffserv in ns manual is
> helpful. Thanks.
>
> -chen xuan
>
>
>  On Wed, 4 Apr 2001, Sudhindra Suresh Bengeri wrote:
>
> > Hi,
> >
> > I want to simulate EF PHB using nortel's diffserv implementation.
> > Specifically I want that packets violating their traffic profile to be
> > dropped, ie, when a packet's codepoint is downgraded it be dropped. I
> > don't want to change their implementation, hence am looking for doing this
> > configuration via tcl scripts.
> >
> > One way of doing it would be to use 2 queues, and use WRR, with a weight
> > of 0 to the second queue. And add PBH entry to add a packet with the
> > downgraded CP to the second queue. But this doesn't actually report
> > dropped packets, only that packets are never actually transmitted.
> >
> > Looking forward to your suggestions.
> >
> > Thanks,
> > Sudhin.
> >
> > ****************** Sudhindra Suresh Bengeri ********************
> > Graduate Research Assistant   | Home:                          |
> > to Dr. George N. Rouskas      | 2110, Gorman St.,              |
> > EGRC 454H, Computer Sci. dept.| Raleigh, NC - 27606            |
> > NCSU, Raleigh, NC 27695       | Ph. (919) 852-1961             |
> > (919)515-3655(P) / 515-7925(F)
> > My web projection: http://www4.ncsu.edu/~ssbenger
> >
> >
>
> --
> Xuan Chen
> USC/ISI
>
>

****************** Sudhindra Suresh Bengeri ********************
Graduate Research Assistant   | Home:                          |
to Dr. George N. Rouskas      | 2110, Gorman St.,              |
EGRC 454H, Computer Sci. dept.| Raleigh, NC - 27606            |
NCSU, Raleigh, NC 27695       | Ph. (919) 852-1961             |
(919)515-3655(P) / 515-7925(F)
My web projection: http://www4.ncsu.edu/~ssbenger