Re: To BECN or not to BECN

From: Victor Cappuccio (vcappuccio@gmail.com)
Date: Wed Apr 02 2008 - 11:29:14 ART

hi, adding a little bit more, from what Jose told...

The same as shape adaptive min-rate using Class Based shaping, and the shape
fecn-adapt to create a Q922 frame, to tell the sender about congestion in
case of unidirectional flow.

The min cir (min rate) parameter in the router(config-pmap-c) shape
adaptive, specifies the minimum shaping rate that is allowed. If a router
receives any BECNs during the current time interval, the routers decreases
the transmition rate by 25% and this will continue going per BECNs received
(limited per time interval) until the traffic hits the min-rate, the routers
then takes 16 times intervals of receiving no BENCs to start to increase
traffic again, by (BE + BC)/16, thus, traffic takes much more to get back to
CIR that it did to drop to min-rate

Best Regards! 

-- 
Victor Cappuccio
www.vcappuccio.wordpress.com

On Tue, Apr 1, 2008 at 4:57 PM, Joseph Saad <joseph.samir.saad@gmail.com>
wrote:

> Know what it does exactly. "As per docCD". Cisco will be generous enough,
> I'd presume, to let you know exactly if it is required or not from the
> question wording.
>
>
> On Tue, Apr 1, 2008 at 6:48 PM, Joseph Brunner <joe@affirmedsystems.com>
> wrote:
>
> > It triggers the sender to slow down by seeing the de bit set by the FRS.
> >
> > You can always leave it off unless this functionality is called for. I
> > could
> > imagine it being "called for" if the question asked for FRTS and
> mentioned
> > "using MINCIR during periods of high utilization", etc.
> >
> > -Joe
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Andy
> > Cole
> > Sent: Tuesday, April 01, 2008 10:35 AM
> > To: groupstudy
> > Subject: To BECN or not to BECN
> >
> > That is the question,,
> >
> > Working on some practice labs and sometimes we use the "frame-relay
> > adaptive-shaping becn" some do not.  Questions are similar.
> > When should we be using BECN and when can we leave it off?
> > Should we enable it all the time?
> > Andy
> >
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