From: Casassa, Nathan (ncasassa@xxxxxxxxxxx)
Date: Sat Jan 06 2001 - 23:55:52 GMT-3
Is there a method or way to determine what the max frame size is in a RIF
with out memorizing the bit patterns and their corresponding max frame
sizes? For example, in the below patterns of the 3 frame size bits in the RC
field of a RIF, I don't see a mathematical pattern that can help me
determine what the max frame size is with out memorizing the bit pattern and
sizes. Anyone know how these sizes were derived?
000 516
001 1500
010 2052
011 4472
100 8144
101 11407
110 17800
111 64000
-----Original Message-----
From: Brian Hescock [mailto:bhescock@cisco.com]
Sent: Saturday, January 06, 2001 9:24 PM
To: ccielab@groupstudy.com
Subject: Re: Limiting Rate on Token Ring (fwd)
Dhans came up with the following; I thought everyone might want to see it.
Brian
---------- Forwarded message ----------
Date: Sat, 06 Jan 2001 18:23:58 -0800
From: Dhanaseker Kandhasamy <dkandhas@cisco.com>
To: Brian Hescock <bhescock@cisco.com>
Subject: Re: Limiting Rate on Token Ring
The way to go. Ineed GTS is the answer.
CIR = Bc/Tc
CIR = 1500000 bits/sec
Tc = 0.075 sec
Bc= Tc*CIR = 1500000*0.075 = 112500
traffic-shape rate 1500000 112500 112500
under TR should be sufficient
Other non-engg method is to try some values for be and be and look for sh
traffic-shape output and tune the values by iteration
Thanks !
Dhans
At 08:45 PM 1/6/01 -0500, you wrote:
>Good point. Have you tried Generic Traffic Shaping?
>
>On Sat, 6 Jan 2001, Dhanaseker Kandhasamy wrote:
>
> > Hi Brian,
> >
> > I was pulling out a whitepaper on CAR and the interesting fact is CAR
> works
> > only for IP.
> > The recommended burst size = rate *1.5 /8
> > Excess Burst is = 2*committed burst
> > Apparently those parameters are very vital.
> >
> > I think IFGs are fixed for ethernet and i don't see a config option
under
> > ethernet.
> > For TR , the closest i have seen is transmitter-delay (in microsec)
> >
> > any thoughts ?
> >
> > Thanks!
> > Dhans
> >
> > At 06:08 PM 1/6/01 -0500, you wrote:
> > >Dhanaseker,
> > > Hi, the reason I had mentioned it would depend on the protocol is I
> > >know you could do it with ipx and set the inter-packet delay for ipx. I
> > >don't know how you could do it with ip but there may be a way.
> > >
> > >Brian
> > >
> > >On Sat, 6 Jan 2001, Dhanaseker Kandhasamy wrote:
> > >
> > > > Hi Brian,
> > > >
> > > > I am not sure how to achieve the inter-packet delay. The closest
> hit is "
> > > > transmitter-delay 75000 ".
> > > >
> > > > Thanks!
> > > > Dhans
> > > >
> > > > At 03:22 PM 1/6/01 -0500, you wrote:
> > > > >You could use CAR to rate-limit it to 1.5Mb. Then dending on what
> protocol
> > > > >you're using you could set the inter-packet delay at 75ms
> (assuming that's
> > > > >what you meant).
> > > > >
> > > > >Brian
> > > > >
> > > > >On Sat, 6 Jan 2001, Dave wrote:
> > > > >
> > > > > > Does anyone know how to limit the speed on a token ring
interface,
> > > and =
> > > > > > at a specific interval at that ?? Say 1.5
> > > > > > MB at a 75MS interval ???
> > > > > >
> > > > > > thanks
> > > > > > dave
> > > > > >
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