From: Ahmed Mamoor Amimi (mamoor@xxxxxxxx)
Date: Tue Feb 12 2002 - 18:50:44 GMT-3
we can tell red wat to drop when there is a congestion
and in CAR we can tell that what is ur lower bursting limit and a bandwidth
as a late resort...
- its just like people working in a underground tunnel for cole.
- they are at there normal routine.
- if a little earth quake comes people work at norm.
- if some big one comes and emergency happens, for that management will open
an emergency gates and will let
the engineers go out first.
So that is same with CAR ....
-We define Bandwith in it as emergency path
- We define max burst and min burst
- if the burst is going below min burst then CAR wakes up
- and let the traffic that is allowed (QoS,CLP,DSCP,precedence) from the
bandwidth that is defined..
on the other hand for the story of WRED..... management will kill the
persons that are workers there and
let the engineer escape out.
That is allow the traffice that is marked as (dscp,precedence) and discard
other packets.
Please correct me if i am wrong.
-Mamoor
----- Original Message -----
From: roy bustos <roybustos@hotmail.com>
To: Ahmed Mamoor Amimi <mamoor@ieee.org>
Sent: Wednesday, February 13, 2002 2:04 AM
Subject: Re: CAR and WRED
> WRED only works with TCP and is based on congestion, it will randomly
drop
> packets once your load reaches congestion,
> CAR is a form of rate limiting, and will perform even without congestion.
>
> Roy
>
> ----- Original Message -----
> From: "Ahmed Mamoor Amimi" <mamoor@ieee.org>
> To: <ccielab@groupstudy.com>
> Sent: Tuesday, February 12, 2002 11:41 AM
> Subject: CAR and WRED
>
>
> > my thinking about CAR and WRED :
> >
> > CAR
> > By CAR u can set normal and max burst then tell if the rate drop from
> > normal then apply precedence or drop or ATM-CLP or QoS or trasmit.
> > General assumption:
> > set min xxx
> > max xxx
> > if min<flow of packet
> > then
> > drop or clp or prec or qos or transmit
> > end
> >
> >
> > WRED
> > Use the random-detect command to enable WRED, which randomly discards
> > packets during congestion based on IP precedence settings
> > General assumption:
> > if RED<flow of packet
> > then
> > {(set precedence 0-7) and (threshold 1-4096)}
> > or
> > set precedence to rsvp packets
> >
> >
> >
> > my thinking is that they both are some what same but CAR is more
flexible
> as
> > it gives u the upper and lower bond of limit
> > to traffic.
> >
> >
> > -Mamoor
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