From: Nick Shah (nshah@connect.com.au)
Date: Wed Sep 18 2002 - 00:11:16 GMT-3
Peng,
Kris is using a 'class'. most likely a CBWFQ. You dont need to use a class
map to be able to use 'random detect'. In a simplistic situation as yours
you can apply it directly to the interface.
Nick
----- Original Message -----
From: "Peng Zheng" <zpnist@yahoo.com>
To: "Nick Shah" <nshah@connect.com.au>; "Kris Keen" <kkeen@bigpond.net.au>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, September 18, 2002 12:49 PM
Subject: Re: Random Detect
> I mean compare to Kris's solution. (attached)
>
>
> --- Nick Shah <nshah@connect.com.au> wrote:
> > 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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