關于 set class_ x?， set fid_ x? 網絡上有一些解釋。 http://blog.csdn.net/wanghui_one/archive/2009/03/12/3985331.aspx http://www.baisi.net/thread-3005681-1-32.html http://www.baisi.net/thread-31289-1-4.html 主要意思是 set class_ x跟nam中顏色設置有關，而set fid_ x是標注網絡流ID，跟著色無關。經在windows XP + cygwin + ns2.29下測試，set fid_ x 在nam中著色的優先級比set class_ x高。具體見后面的例子。 #Create a simulator object set ns [new Simulator]#Define different colors for data flows (for NAM) $ns color 1 Blue $ns color 2 Red#Open the NAM trace file set nf [open out.nam w] $ns namtrace-all $nf#Define a 'finish' procedure proc finish {} {global ns nf$ns flush-trace#Close the NAM trace fileclose $nf#Execute NAM on the trace fileexec nam out.nam &exit 0 }#Create four nodes set n0 [$ns node] set n1 [$ns node] set n2 [$ns node] set n3 [$ns node]#Create links between the nodes $ns duplex-link $n0 $n2 2Mb 10ms DropTail $ns duplex-link $n1 $n2 2Mb 10ms DropTail $ns duplex-link $n2 $n3 1.7Mb 20ms DropTail#Set Queue Size of link (n2-n3) to 10 $ns queue-limit $n2 $n3 10#Give node position (for NAM) $ns duplex-link-op $n0 $n2 orient right-down $ns duplex-link-op $n1 $n2 orient right-up $ns duplex-link-op $n2 $n3 orient right#Monitor the queue for link (n2-n3). (for NAM) $ns duplex-link-op $n2 $n3 queuePos 0.5#Setup a TCP connection set tcp [new Agent/TCP] $tcp set class_ 2 $ns attach-agent $n0 $tcp set sink [new Agent/TCPSink] $ns attach-agent $n3 $sink $ns connect $tcp $sink $tcp set fid_ 1#Setup a FTP over TCP connection set ftp [new Application/FTP] $ftp attach-agent $tcp $ftp set type_ FTP#Setup a UDP connection set udp [new Agent/UDP] $ns attach-agent $n1 $udp set null [new Agent/Null] $ns attach-agent $n3 $null $ns connect $udp $null $udp set fid_ 2#Setup a CBR over UDP connection set cbr [new Application/Traffic/CBR] $cbr attach-agent $udp $cbr set type_ CBR $cbr set packet_size_ 1000 $cbr set rate_ 1mb $cbr set random_ false#Schedule events for the CBR and FTP agents $ns at 0.1 "$cbr start" $ns at 1.0 "$ftp start" $ns at 4.0 "$ftp stop" $ns at 4.5 "$cbr stop"#Detach tcp and sink agents (not really necessary) $ns at 4.5 "$ns detach-agent $n0 $tcp ; $ns detach-agent $n3 $sink"#Call the finish procedure after 5 seconds of simulation time $ns at 5.0 "finish"#Print CBR packet size and interval puts "CBR packet size = [$cbr set packet_size_]" puts "CBR interval = [$cbr set interval_]"#Run the simulation $ns run 此例中只要改變 set fid_ x 中 'x'的值，在nam中對應網絡流的顏色必改變。而改變set class_ x 中 'x'的值，顏色不改變。當把set fid_ x 語句都注釋掉后，再把set class_ x 中的 'x' 值改為對應的顏色值，顏色隨之改變。再把set class_ x 都注釋掉，顏色都為黑色。

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