I only see two examples on that page that are different.  The first is
on a 56k link, Bc=1000 and CIR=56000.  Bc/CIR = .0178, or basically
18ms.  I know that's higher than the recommended 10ms, but perhaps there
are drawbacks to lowering the Bc below 1000 that I'm not aware of.

The other example is on a 256k link.  Bc = 1000, CIR = 256000, so
Bc/CIR = .004, or 4ms.  This will set your Tc to the minimum of 10ms,
IIRC.

Regards,
John

>>> "Steven A. Ridder"  12/18/01 5:22:56 PM >>>
The bc info for the Frame-Relay traffic shaping info on that page is
wrong.
One should always target Bc to get a Tc of 10ms, but the config
examples are
more like a Bc of 36.4.  So you have the serialization delay time at
36.4,
but optimally you want 10ms.  The packets will be going out at 10ms (or
less
cause fragmentation ias correct) but the time interval the router uses
is at
36.4ms.
""John Neiberger""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Here is another link that deals with WAN QoS, including some items
that
> might not occur to you such as sizing the interface transmit ring.
>
>
http://www.cisco.com/univercd/cc/td/doc/product/voice/ip_tele/avvidqos/qoswa

n.htm
>
>
> HTH,
> John




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