Re: Difference between Agent/UDP+Application/Traffic/CBR & Agent/CBR

[Tarik Alj <aljtarik@ozias.inrs-telecom.uquebec.ca>]

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> From: "Bancherdvanich Terdsak" <terdsak@ust.hk>
> To: <ns-users@mash.cs.berkeley.edu>
> Subject: Difference between Agent/UDP+Application/Traffic/CBR & Agent/CBR
> Date: Thu, 4 Nov 1999 22:50:36 +0800
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> 
> Hi, 
> 
> I am new in NS-2. I would like to ask what is the difference between
> 
> i) set udp0 [new Agent/UDP]
>    $ns attach-agent $n0 $udp0
>    set cbr0 [new Application/Traffic/CBR]
>    $cbr0 attach-agent $udp0

udp is a transport agent

> 
> ii) set cbr0 [new Agent/CBR]
>     $ns attach-agent $n0 $cbr0

cbr is for constant bit rate and is a traffic source. But this way of doing has 
been deprecated; you should use something like:

set cbr [new Application/Traffic/CBR]

An example of a cbr source over a udp agent would be:

set udp [new Agent/UDP]
$ns attach-agent $n0 $udp

set cbr [new Application/Traffic/CBR]
$cbr attach-agent $udp

set sink [new Agent/LossMonitor]
$ns attach-agent $n1 $sink

$ns connect $udp $sink

$ns at 0.0 "$cbr start"
$ns at 1.0 "$cbr stop"

as of ns-2.1b5.

> 
> Thank you
> 
> Terdsak
> 
> 

Tarik