Re: [ns] question on CBQ

[Carlos Alberto Kamienski <cak@cin.ufpe.br>]

> Dear all,
> I just begin using the ns to simulate the CBQ and can't find the reason of errors in my script.Please give me some suggestions.
> Please it is urgent.
> Thanks in advance!

rtproto DV generates packets with field fid_ = 0 and you didn't bind
any queue to fid_ 0. So, these packets arrive at the node and there is no
queue to put them in.

Carlos

>
>
> set ns [new Simulator]
> $ns rtproto DV
>
> set nf [open cbq.nam w]
> $ns namtrace-all $nf
> set tf [open cbq.tra w]
> $ns trace-all $tf
>
> #Create 4 nodes
> set n1 [$ns node]
> set n2 [$ns node]
> set n3 [$ns node]
> set n4 [$ns node]
>
> $ns color 1 red
> $ns color 2 blue
>
> $ns duplex-link $n1 $n3 2Mb 100ms DropTail
> $ns duplex-link $n2 $n3 2Mb 100ms DropTail
> $ns duplex-link $n3 $n4 2.2Mb 100ms CBQ
> set cbqlink [$ns link $n3 $n4]
>
> $ns duplex-link-op $n1 $n3 orient right-up
> $ns duplex-link-op $n2 $n3 orient right
> $ns duplex-link-op $n3 $n4 orient right
> $ns duplex-link-op $n3 $n4 queuePos 0
>
> #Set  two leaf classes: lowerClass1 and lowerClass2
> set topClass [new CBQClass]
> set lowerClass1 [new CBQClass]
> set lowerClass2 [new CBQClass]
> $topClass setparams none 0 0.80 auto 0 2 0
> $lowerClass1 setparams $topClass true 0.35 auto 1 1 0
> $lowerClass2 setparams $topClass true 0.35 auto 2 1 0
>
> set q1 [new Queue/DropTail]
> $q1 set limit_ 10
> set q2 [new Queue/DropTail]
> $q2 set limit_ 10
>
> $lowerClass1 install-queue $q1
> $lowerClass2 install-queue $q2
>
> $cbqlink insert $topClass
> $cbqlink insert $lowerClass1
> $cbqlink insert $lowerClass2
> $cbqlink bind $lowerClass1 1
> $cbqlink bind $lowerClass2 2
>
> #generate traffic from n1 , n2  to n4 via n3
> set null1 [new Agent/Null]
> $ns attach-agent $n4 $null1
> set s1 [new Agent/UDP]
> $ns attach-agent $n1 $s1
> $ns connect $s1 $null1
> set cbr1 [new Application/Traffic/CBR]
> $cbr1 set packetSize_ 750
> $cbr1 set interval_ 0.005
> $cbr1 attach-agent $s1
> $s1 set fid_ 1
>
> set s2 [new Agent/UDP]
> $ns attach-agent $n2 $s2
> $ns connect $s2 $null1
> set cbr2 [new Application/Traffic/CBR]
> $cbr2 set packetSize_ 750
> $cbr2 set interval_ 0.005
> $cbr2 attach-agent $s2
> $s2 set fid_ 2
>
> $ns trace-queue $n3 $n4 $sender
>
> proc finish {} {
> global ns nf tf
> $ns flush-trace
> close $nf
> exit 0
> }
>
> $ns at 0.1 "$cbr1 start"
> $ns at 0.1 "$cbr2 start"
> $ns at 2.0 "$cbr1 stop"
> $ns at 2.0 "$cbr2 stop"
>
> $ns run
>
> The error message is:
> ns: _o71 unknown-flow 3 2 0:
>     (_o71 cmd line 1)
>     invoked from within
> "_o71 cmd unknown-flow 3 2 0"
>     invoked from within
> "catch "$self cmd $args" ret"
>     (procedure "_o71" line 2)
>     (SplitObject unknown line 2)
>     invoked from within
> "_o71 unknown-flow 3 2 0"
>
> This script works correctly after i delete the line "$ns rtproto DV ".why? why??
>
>
>
>
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