From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Fri Oct 04 2002 - 17:22:59 GMT-3
Chris,
Tc is 100ms, not 10. That's why "you can burst" for 100ms.
You can not burst to T1 speed for long. Actually, a T1 will always
transmit at T1 speed. Shape calculations are done every Tc,
you can get 12800 bits on your first chunk and if you do, then
just 6400 every 100ms thereafter.
Chris wrote:
> Ok, so now with the tc = 10 this makes a little more sense. 6400 bits * 10
> intervals is 64k, but how do they come up with it can burst to T-1 for 100
> ms?
>
>
> If I have 6400 * 10 intervals and I can burst an extra 6400 in the first
> interval that does not = T-1 speed.
>
> ----- Original Message -----
> From: "Larson, Chris" <CLarson@usaid.gov>
> To: "Larson, Chris" <CLarson@usaid.gov>; <ccielab@groupstudy.com>
> Sent: Friday, October 04, 2002 2:01 PM
> Subject: RE: Traffic Shaping
>
>
>
>>Also, the tc is ten here right? tc=cir/bc 64000/6400
>
> =
>
>>10
>>
>>
>>>-----Original Message-----
>>>From: Larson, Chris
>>>Sent: Friday, October 04, 2002 1:51 PM
>>>To: 'ccielab@groupstudy.com'
>>>Subject: Traffic Shaping
>>>
>>>I know this has been round and round, but I thought I got it until I
>>
> came
>
>>>across this
>>>
>>>In this example, a T1 line may be used for 100 milliseconds (ms) in a
>>>burst, but the long-term average is limited to 64 kbps. This
>>
> configuration
>
>>>example restricts the amount of load the system can induce on the
>>
> outbound
>
>>>network interface.
>>>interface serial 4/1:0
>>> traffic-shape rate 64000 6400 6400
>>>
>>>
>>>Can someone explain this to me. I thought the bc = 6400 * 8 intervals =
>>>51200
>>>If I can send an extra 6400 bits in the first interval that is still
>>
> only
>
>>>57600.
>>>
>>>
>>>
>>>
>>>
>>>Christopher Larson - CNE, MCP+I, CCNP + Security
>>>Open Systems Sciences Corp.
>>>USAID Information Resources Management (contractor)
>>>202 712 4559
>>>clarson@usaid.gov
>>
>
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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