RE: [PCN] Re: WG Review: Congestion and Pre-Congestion Notification(pcn)

["Georgios Karagiannis" <karagian at cs.utwente.nl>]

Hi Fred

I think that one of the goals of the PCN WG will be to investigate 
the implications of using ECN and/or DSCP for PCN encoding purposes.

Best Regards,
Georgios


> -----Original Message-----
> From: Fred Baker [mailto:fred at cisco.com] 
> Sent: dinsdag 20 februari 2007 15:31
> To: Georgios Karagiannis
> Cc: Pekka Savola; Black_David at emc.com; pcn at ietf.org; 
> iesg at ietf.org; ietf at ietf.org
> Subject: Re: [PCN] Re: WG Review: Congestion and 
> Pre-Congestion Notification(pcn)
> 
> 
> On Feb 20, 2007, at 8:15 AM, Georgios Karagiannis wrote:
> 
> > I assume that you also have no objection on using the DSCP 
> fields for 
> > this purpose.
> 
> actually, I do, at least in some ways that they might be 
> used. The AF service (RFC 2597) is specifically designed to 
> do as you say; EF isn't. setting the DSCP on an EF packet in 
> a way that nullifies its EF behavior to communicate the onset 
> of congestion mostly nullifies the EF service (which doesn't 
> actually do much of anything when there is no congestion to 
> perturb packet timing). So I would want any use of the DSCP 
> to be coordinated with the other services that the datagram hopes for.
> 



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