From: Chris (clarson52@comcast.net)
Date: Fri Oct 04 2002 - 17:52:10 GMT-3
RE: Traffic ShapingOk, I understand the statement better. I read it wrong I thought it was implying that it burst to T-1 for 100 ms, not just that it would burst.
Thanks for helping me with tc.
I was improperly labeling tc for the number of intervals.
----- Original Message -----
From: Gene_Thorne@doh.state.fl.us
To: clarson52@comcast.net ; CLarson@usaid.gov ; ccielab@groupstudy.com
Sent: Friday, October 04, 2002 4:14 PM
Subject: RE: Traffic Shaping
I think you are misinterpreting this example.
tc=bc/cir (not the other way 'round)
tc= 6400 b / (64000b/s) = 0.1 s = 100ms
So it is saying that the T1 may be used for 100ms in a burst (i.e. 1 interval), but the excess burst size during that interval is be or 6400 b. I don't think they mean to imply it bursts all the way to T1 speed; on the contrary, it explicity states that the example "restricts the amount of load the system can induce on the outbound network interface." That is the purpose of be, right?
-----Original Message-----
From: Chris [mailto:clarson52@comcast.net]
Sent: Friday, October 04, 2002 3:08 PM
To: Larson, Chris; ccielab@groupstudy.com
Subject: Re: Traffic Shaping
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
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