From: Ahmed Mamoor Amimi (mamoor@xxxxxxxx)
Date: Mon Jul 15 2002 - 23:43:52 GMT-3
i totally agree with u that Be is the burst and is send at the first
interval this is my same concept.... but that means that cco doc:
http://www.cisco.com/warp/public/125/traffic_shaping_6151.html
is wrong as there Be = 16000 which is (AR-CIR)*0.125 = (192000-64000)*0.125
= 16000
It should be Be = 128000
-Mamoor
----- Original Message -----
From: David Luu <wicked01@ix.netcom.com>
To: Ahmed Mamoor Amimi <mamoor@ieee.org>; Guoqi Cui <guoqicui@yahoo.com>;
Bruce Williams <bruce@williamsnetworking.com>; Lab Candidate
<labccie@yahoo.com>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, July 16, 2002 5:49 AM
Subject: Re: FRTS want to nail it down !!
> like i said in a previous post...
> "Be" sends excess data in the FIRST interval if there are enough tokens,
it
> does not send it in the other intervals
>
> take the bottom example...
> port speed = 64000bps
> cir = 32000bps
> mincir = 16000bps
> bc = 4000bps
> be = 32000bps
>
> first we will start off with "Bc", to get "Bc" we divide 1 second (1000ms)
> by the time interval (which is 125ms in this case), which is 1000ms
divided
> by 125ms = 8...this gives us 8 intervals, so a 32000bps cir divided by 8
> gives us a "Bc" of 4000bps
>
> again, "Be" sends excess data in the FIRST interval if there are enough
> tokens, it does not send it in the other intervals...to send data at the
> maximum rate the port can handle, we take the port speed of 64000bps minus
> the cir of 32000bps...this leaves us with 32000bps to send in the first
> interval...
>
> if we were to have a "Be" of 4000bps, the max rate we can send is cir + be
> (32000+4000), which equals 36000bps, remember that "Be" is only sent out
in
> the FIRST interval if there are available tokens
>
> with a Tc of 125ms, it gives us 8 intervals
> with a Tc of 10ms, it gives us 100 intervals
>
> once again i have to stress this, "Be" is only sent out in the FIRST
> interval if tokens are available...with a Tc of 125ms or 10ms, "Be" will
> still only be sent out ONE time every second (1000ms)
>
> hope this clears up any confusion you may have with "Be" and "Bc"
>
> At 01:33 AM 7/16/2002 +0500, Ahmed Mamoor Amimi wrote:
> >aaaahhhh !! atleast ur with me... heheheeh... this is what i have beening
> >saying but not getting a very difinite answer from the group why they
have
> >used 32000 as be in power session. if bc is multipy by 0.125 then be
should
> >also be multiply by 0.125 ... why 1 sec
> >
> >-Mamoor
> >
> >
> >----- Original Message -----
> >From: Guoqi Cui <guoqicui@yahoo.com>
> >To: Bruce Williams <bruce@williamsnetworking.com>; Lab Candidate
> ><labccie@yahoo.com>; Ahmed Mamoor Amimi <mamoor@ieee.org>
> >Cc: <ccielab@groupstudy.com>
> >Sent: Monday, July 15, 2002 9:49 PM
> >Subject: RE: FRTS want to nail it down !!
> >
> >
> > > The FRTS parameters are quite confusing.
> > > CIR, MINCIR is in unit of bps
> > > BC, BE is in unit of bits
> > >
> > > If BE is set as: port_speed minus-cir
> > > it will hava a unit of bps,
> > >
> > > Do Tc is assumed to be 1 sec?
> > >
> > > For this case( Tc=0.125 sec),
> > >
> > > BE should be set as 32000/8=4000.
> > >
> > >
> > > --- Bruce Williams <bruce@williamsnetworking.com>
> > > wrote:
> > > > If the available bandwidth is 32000, then dont we
> > > > still need to multiply it
> > > > by .0125 to get the bits per Tc?
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com
> > > > [mailto:nobody@groupstudy.com]On Behalf Of
> > > > Lab Candidate
> > > > Sent: Sunday, July 14, 2002 1:03 AM
> > > > To: Ahmed Mamoor Amimi
> > > > Cc: ccielab@groupstudy.com
> > > > Subject: Re: FRTS want to nail it down !!
> > > >
> > > >
> > > > Mamoor,
> > > >
> > > > This is obvious, since you said the port speed is
> > > > 64000 and cir is 32000,
> > > > if you want to utilized the most of your available
> > > > bandwidth for burst
> > > > purpose, the be would be equal to port_speed minus
> > > > cir, hence 32000 bps.
> > > >
> > > >
> > > >
> > > > I was reading the power-session 2002, here on page
> > > > 66 they have given the
> > > > values like :
> > > >
> > > > Port Speed: 64000 Bps
> > > > CIR : 32000 Bps (Average Rate of Traffic Without
> > > > Congestion)
> > > > Mincir: 16000 Bps (Average Rate of Traffic With
> > > > Congestion)
> > > > Bc: 4000 Bps (Amount of Data Sent Per Interval)
> > > > Be: 32000 Bps (Amount of Excess Allowed Once Credit
> > > > Has Built Up)
> > > >
> > > > interface Serial0
> > > > ip address 10.10.10.1 255.255.255.0
> > > > encapsulation frame-relay
> > > > frame-relay traffic-shaping
> > > > frame-relay class ccie
> > > >
> > > > map-class frame-relay ccie
> > > > frame-relay adaptive-shaping becn
> > > > frame-relay cir 32000
> > > > frame-relay mincir 16000
> > > > frame-relay bc 4000
> > > > frame-relay be 32000
> > > >
> > > > Can someone explain why Be = 32000 , why not Be =
> > > > 32000 * 0.125 = 4000
> > > >
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:36:31 GMT-3