set ns [new Simulator]

set n0 [$ns node]
set n1 [$ns node]

set f [open out.tr w]
$ns trace-all $f


# install a duplex link with WFQ queues at both ends
$ns duplex-link $n0 $n1 5Mb 2ms WFQ 10

# create an instance of the classifier suited for flow aggregation
set cl [new WFQAggregClassifier]

# install the classifier on the WFQ server at node $n0 heading at nt $n1
$ns wfqclassifier-install $n0 $n1 $cl 

# in this example we have a flow for each queue but
# more than one flow can be assigned to the same WFQ server queue(PGPS session)
$cl setqueue 0 3; # fid 0 -> WFQ server queue 3
$cl setqueue 1 4; # fid 1 -> WFQ server queue 4

#we set WFQ server queue weights
$cl setweight 3 .5; # WFQ server queue 3 has weight .5
$cl setlength 3 13; # WFQ server queue 3 has length 13 packets
$cl setweight 4 .2; # WFQ server queue 5 has weight .2
$cl setlength 4 20; # WFQ server queue 5 has length 20 packets


set udp0 [new Agent/UDP]
$ns attach-agent $n0 $udp0
$udp0 set fid_ 0; # this is the info used by WFQ classifier
set cbr0 [new Application/Traffic/CBR]
$cbr0 attach-agent $udp0

set udp1 [new Agent/UDP]
$ns attach-agent $n0 $udp1
$udp1 set fid_ 1; # this is the info used by WFQ classifier
set cbr1 [new Application/Traffic/CBR]
$cbr1 attach-agent $udp1

set null0 [new Agent/Null]
$ns attach-agent $n1 $null0

set null1 [new Agent/Null]
$ns attach-agent $n1 $null1

$ns connect $udp0 $null0
$ns connect $udp1 $null1

$ns at 1.0 "$cbr0 start"
$ns at 1.1 "$cbr1 start"


$ns at 3.0 "finish"

proc finish {} {
	global ns f 
	$ns flush-trace
	close $f

	exit 0
}

$ns run