From: Saru Vijayakumar (v_saru@hotmail.com)
Date: Tue Oct 08 2002 - 10:36:22 GMT-3
Here is a very good link from Cisco:
Here is how I understood this:
cir - The average rate you want to send traffic on a pvc in bps. This is
generally higher than guaranteed rate but less than Access Rate (AR) which
is the physical speed of the port.
mincir - Actual guaranteed rate obtained from a service provider in bps.
This value should be the min-rate you should drop to in the event of
congestion. Dropping below min-cir implies you are not getting the BW you
are paying for.
AR - This is Access Rate (physical speed of port) to which you can burst to
over very small time intervals Tc which is 1/8 sec for this scenario.
HTH.
>From: Giveortake@aol.com
>Reply-To: Giveortake@aol.com
>To: Svuillaume8@aol.com, ccielab@groupstudy.com
>Subject: Re: FRTS
>Date: Mon, 7 Oct 2002 21:27:23 EDT
>
>If thats what Jeff Doyle says, I say Jeff Doyle is wrong! But then again
>who am I (dumb guy who failed twice) That may be ok for certain
>situations,
>but does not cover all.
>
>I don't believe you can make a blanket statement like that listed below.
>Frankly its just wrong. It may be right in a "specific" scenerio but
>WRONG
>for another.
>
>CIR = Port physical speed
>Mincir= CIR ( cir provides by carrier)
>Bc= remote speed circuit /8
>Be<= port speed of the remote router
>
>Actually I think the blanket statements like this are killing people from
>understanding. What we need are a couple good scenerios to demonstrate
>real
>life situations such as over subscribing a head end, throttling back to
>certain transmit rates if BECN's received etc.......... Traffic shaping
>takes some math and some thought. Not memorize these four lines.
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