From: Darren Johnson (dazza_johnson@yahoo.co.uk)
Date: Tue Oct 16 2007 - 12:10:06 ART
I cannot recall where I read this now. The only document I could find is here:
http://www.cisco.com/en/US/partner/tech/tk713/tk237/technologies_tech_note09186a00801e32e7.shtml
Check out 'excess burst' where it states "Generally, Be data is delivered with a lower probability than Bc, and the network treats it as discard eligible"
I know I read about it somewhere, but cannot recall where :-(
----- Original Message ----
From: Gregory Gombas <ggombas@gmail.com>
To: Darren Johnson <dazza_johnson@yahoo.co.uk>
Cc: ccielab@groupstudy.com
Sent: Tuesday, 16 October, 2007 3:13:50 PM
Subject: Re: Frame-relay traffic shaping.
Sounds good to me - not sure about the DE bit getting automatically
set on the BE bits though...do you have a link to that doc?
On 10/4/07, Darren Johnson <dazza_johnson@yahoo.co.uk> wrote:
> Hello all. I want to get this nailed once and for all.
>
> I have a serial line clocking at 128kbps. I configure
> FRTS as follows:
>
> CIR = 64000
> Bc = 8000
> Be = 8000
> MinCIR = 32000
>
> My understanding is this. I can send 8000 bits (Bc)
> per Tc. Tc = CIR/Bc, so I can send 8000 bits every
> 125ms. On a serial interface clocking 128kbps, this
> means that it will take only half of the Tc to send
> the Bc (128000/8 = 16000 bits can be sent every
> 125ms).
>
> So far so good. If I don't send any data for a full 1
> second (all 8 Tc), then I can use these for Be over
> the next Tc(s). The next second I transmit Bc (which
> takes half the Tc) but I can also send Be (8000 bits)
> becuase these were not used in previous Tc(s).
>
> If I understand this right, if I send no data in 1
> second, the next second I can send 16000 bits (Bc +
> Be) for each Tc = 128kbps.
>
> Additionally, the Be bits get the DE set to 1 by
> default. Is this correct?
>
> Hopefully someone can help confirm if I have nailed it
> or not :-)
>
> Dazzler
>
>
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