Re: [RPRWG] RAH: Re: Minutes of Rate Ad Hoc meeting
Yiming,
speaking as a technical expert,
while I understand your desire to have LP packets dropped, be aware
that 802 has never had a MAC that drops packets from the medium
except due to a CRC errors.
From a compliance testing perspective, the issue of packet drops
would make it difficult (if not impossible) to provide a test
that proved compliance if packet drops were allowed. Remember,
if you can't test for compliance, it is not a standard.
I believe that proper use of reserved BW will remove any need to
drop packets. I look forward to seeing the simulation results
that show problems as a part of the RAH.
mike
> Yiming Yao wrote:
>
> Hans,
>
> The current draft of the RPR standard tries to achieve several objectives: high link utilization,
> guaranteed minimum jitter for reserved HP traffic, no packet loss on the ring, etc, and these
> objectives are conflicting to each other sometimes. One customer may want to disallow any LP
> packet drop on the ring even this means high jitter for the HP traffic; another may want to
> guarantee minimum jitter to HP traffic (carrying TDM) at risk of occasionally dropping some LP
> packets.
>
> My suggestion is that RPR provide a choice for the customer to make his/her decision in conflict
> resolution.
>
> I didn't assume the operator wants to adjust the total load/throughput. Maybe this can be done
> more easily if the above choice is provided.
>
> Regards,
>
> Yiming
>
> -----Original Message-----
> From: hans-j.reumerman@xxxxxxxxxxx [mailto:hans-j.reumerman@xxxxxxxxxxx]
> Sent: Friday, March 15, 2002 1:35 AM
> To: stds-802-17@xxxxxxxx
> Subject: [RPRWG] RAH: Re: Minutes of Rate Ad Hoc meeting
>
> > Yiming Yao: allow customer to choose between loss, jitter, and utilization
>
> Is the underlying assumption that the operator of the ring (=customer?) wants to
> adjust the total load/throughput? Would this be for loadbalancing purposes?
>
> regards,
> Hans
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Hans-Jürgen Reumerman
> Hans-J.Reumerman@xxxxxxxxxxx
> Digital Communications & networking pww.pfa.research.philips.com/dc/
> Philips Research Laboratories Phone: +49 241 6003 629
> Weisshausstr.2, 52066 Aachen, Germany Fax: +49 241 6003 519
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
Michael Takefman tak@xxxxxxxxx
Manager of Engineering, Cisco Systems
Chair IEEE 802.17 Stds WG
2000 Innovation Dr, Ottawa, Canada, K2K 3E8
voice: 613-254-3399 fax: 613-254-4867