From: Brian Dennis (brian@labforge.com)
Date: Thu Apr 17 2003 - 02:25:15 GMT-3
<Resending this post>
Here is what the "other" Brian is doing:
Bc = (64000 * 125)/1000
As opposed to:
Bc = (64000 * .125)
In this example he is saying Tc = 125ms and you are saying Tc = .125
seconds. They are both the same.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
Director of CCIE Training and Development - IPexpert, Inc.
Mailto: brian@ipexpert.net
Toll Free: 866.225.8064
Outside U.S. & Canada: 312.321.6924
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jonathan V Hays
Sent: Wednesday, April 16, 2003 6:00 PM
To: 'Brian McGahan'; ccielab@groupstudy.com
Cc: 'Mike Williams'
Subject: RE: MINCIR = CIR?
> -----Original Message-----
> From: Brian McGahan [mailto:brian@cyscoexpert.com]
> Sent: Wednesday, April 16, 2003 1:33 PM
> To: 'Jonathan V Hays'; ccielab@groupstudy.com
> Cc: 'Mike Williams'
> Subject: RE: MINCIR = CIR?
>
[snip]
> The following formulas hold true for Cisco's
> implementation of Frame-Relay Traffic Shaping:
>
> Bc = (CIR * Tc)/1000
> Be = ((AR - CIR) * Tc)/1000
>
Brian,
What units are you using to require division by 1000? Most Cisco
documents seem to give Bc= CIR * Tc.
http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_e
xample09186a00800942f8.shtml
See the document I cited in my earlier post (included above) under
"Nonconfigurable parameters - interval (Tc)" -
--- "The time interval during which you send the Bc bits in order to maintain the average rate of the CIR in seconds.Tc = Bc/CIR in seconds.
The range for Tc is between 10 ms and 125 ms." --- In the example given in the Cisco document, Bc is 8000 bits, CIR is 64000 bps, then Tc = 8000 bits / 64000 bps = 1/8 second.
Or if you use Bc = CIR * Tc, then Bc = 64000 bps * 1/8 second = 8000 bits.
What does dividing by 1000 get me?
Thanks.
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