From: Nick Shah (nshah@connect.com.au)
Date: Tue Sep 17 2002 - 23:35:55 GMT-3
Peng
just random-detect in interface configuration mode, ENABLES WRED.
random-detect with precedence and other parameters change the default
parameters.
The default parameters are : The weight factor is 9. For all precedences,
the mark probability denominator is 10, and maximum threshold is based on
the output buffering capacity and the transmission speed for the interface.
So if the question states that you jsut have to enable/use WRED, then
'random-detect' will suffice.
If the question states changing the default values or specific precedence
values, then you have to use both.
rgds
Nick
----- Original Message -----
From: "Peng Zheng" <zpnist@yahoo.com>
To: "Kris Keen" <kkeen@bigpond.net.au>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, September 18, 2002 11:53 AM
Subject: Re: Random Detect
> I received another solution:
>
> 1. enable random detect
>
> random-detect
>
> 2. random-detect precedence p min-threshold
> max-threshold
> mark-prob-denominator
>
> random-detect prededence X 40
> 100
> 40
>
>
> Which one is correct?
>
>
> --- Kris Keen <kkeen@bigpond.net.au> wrote:
> > Peng,
> >
> > The comands you want are:
> >
> > random-detect dscp (if you are using dscp) <dscp
> > value> <min thres> <max
> > thres> <drop rate>
> >
> > I believe this can be done with precedeance, you'd
> > need to match the source
> > ranges with an access list and define a policy map
> > tied to a class which
> > will define your drop rates.
> >
> > drop rate will be the number it will drop once your
> > thresholds are exceeded
> > for instance, drop 20 is drop 1 out of 20 packets.
> > The lower the value the
> > more aggresive the drops are
> > You can set also under the class a queue-limit, this
> > will define your queue
> > size.
> >
> > I do some work with DSCP but never Precedance, so I
> > guess this email is at
> > least pointing you in the right direction.
> >
> > here is a sample of a class we have defined for data
> >
> >
> > class DSCP-OUT-Data2
> > bandwidth percent 33
> > random-detect dscp-based
> > random-detect exponential-weighting-constant 6
> > random-detect dscp 18 15 28 15
> > random-detect dscp 20 1 13 3
> > queue-limit 200
> > fair-queue
> >
> >
> > As you can see, DSCP 20 which was set and matched
> > with an access list has a
> > more aggressive drop rate with smaller queue sizes
> > (0 to 1 packet, 1 to 13
> > packets and then when exceeded drop 1 in 3 packets.
> > DSCP 18 is less
> > aggresive.
> >
> > Hope that helps
> > Kris
> > ----- Original Message -----
> > From: "Peng Zheng" <zpnist@yahoo.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Wednesday, September 18, 2002 8:36 AM
> > Subject: Random Detect
> >
> >
> > > Hi,
> > >
> > > Asked to configure:
> > >
> > > Wred under some interface.
> > >
> > > requirement:
> > >
> > > 1) for specific precedence, for example, critical,
> > > specify drop 1 out of 40
> > >
> > > 2) minimum queue 40, maximum queue 100
> > >
> > >
> > > Thanks for help.
> > >
> > >
> > > Best Wishes,
> > > Peng Zheng
> > >
> > > __________________________________________________
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> >
>
>
>
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