From: Kemal YILDIRIM (kemalhy@gmail.com)
Date: Fri May 05 2006 - 15:17:15 ART
Hi all,
Tc, is a time interval that BC and BE measured.
Also we migth think it as a window that we can measure the BC and BE values.
Assume that you can send more data over CIR if you have a proper service
contract.
The data that must sent over CIR value must be under a granular control.
You migth want to sent all of your data in a burst, but this is not what a
good behavior. Instead we need to send it in a more homogeneous form.
At the end of TC interval we would send the same amount data over CIR, but
using a small TC will form a more robust link.
Regards,
Kemal
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Nick
Griffin
Sent: Friday, May 05, 2006 8:50 PM
To: Mike O
Cc: ccielab@groupstudy.com
Subject: Re: FRTS question
Tc, is the rate at which the router needs to send per interval in order
to reach the CIR that you define, your rate for cir is defined in bits
per second, routers think milliseconds, hence the reasoning for the Tc
and intervals. If routers sent traffic only every second, think of the
delay that would create. The default Tc is 125ms. Check out the slide below:
http://www.internetworkexpert.com/resources/01700368.htm
Mike O wrote:
> The question asks that DLCI 100 conform to the ISP's CIR of 128000
> with a port speed of 512k and the rest of the DLCI's get the remaining
> bandwidth. DLCI 100 should not burst above 128k.
>
> I'm supposed to use the lowest Tc avaiable for DLCI 100 and the rest
> should use the default Tc.
>
>
> I've never really understood the Tc.
>
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