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Multicast in ns-2

Multicast in ns-2. 報告者 : 陳沐恩. Multicast 簡介. Multicast Routing. set ns [new Simulator] $ns multicast Or set ns [new Simulator – multicast on] set mproto <type> <type>: CtrMcast, DM, ST, BST. Multicast Routing. all nodes will contain multicast protocol agents

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Multicast in ns-2

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  1. Multicast in ns-2 報告者:陳沐恩

  2. Multicast 簡介

  3. Multicast Routing • set ns [new Simulator] $ns multicast Or set ns [new Simulator –multicast on] • set mproto <type> <type>:CtrMcast, DM, ST, BST

  4. Multicast Routing • all nodes will contain multicast protocol agents • set mrthandle [$ns mrtproto $mproto] • allocating a multicast address • set group [Node allocaddr] • define an agent and as a multicast source for the group • $udp1 set dst_addr_ $group • $udp1 set dst_port_ 0

  5. Multicast Routing • create a receiver agent • set rcvr [new Agent/LossMonitor] • specify which nodes join the group and when they want to join the group • $ns at 0.0 "$n1 join-group $rcvr $group" • make a node leave the group at a time • $ns at 1.6 "$n2 leave-group $rcvr $group"

  6. Multicast:Step1 • Scheduler , tracing , and topology # Create scheduler set ns [new Simulator] # Turn on multicast $ns multicast # Turn on Tracing set fd [new “mcast.nam” w] $ns namtrace-all $fd

  7. Multicast:Step2 • Topology # Create nodes set n0 [$ns node] set n1 [$ns node] set n2 [$ns node] set n3 [$ns node] # Create links $ns duplex-link $n0 $n1 1.5Mb 10ms DropTail $ns duplex-link $n0 $n2 1.5Mb 10ms DropTail $ns duplex-link $n0 $n3 1.5Mb 10ms DropTail

  8. Multicast:Step3 • Routing and group setup # Routing protocol: let’s run distance vector set mproto DM # Allocate group addresses set group1 [Node allocaddr] set group2 [Node allocaddr]

  9. Multicast:Step4 • Sender0 # Transport agent for the traffic source set udp0 [new Agent/UDP] $ns attach-agent $n1 $udp0 $udp0 set dst_addr_ $group1 $udp0 set dst_port_ 0 # Constant Bit Rate source #0 set cbr0 [new Application/Traffic/CBR] $cbr0 attach-agent $udp0 # Start at time 1.0 second $ns at 1.0 "$cbr0 start"

  10. Multicast:Step5 • Sender1 # Transport agent for the traffic source set udp1 [new Agent/UDP] $ns attach-agent $n3 $udp1 $udp1 set dst_addr_ $group2 $udp1 set dst_port_ 0 # Constant Bit Rate source #0 set cbr1 [new Application/Traffic/CBR] $cbr1 attach-agent $udp1 # Start at time 1.1 second $ns at 1.1 "$cbr1 start"

  11. Multicast:Step6 • Receiver with dynamic membership # Can also be Agent/Null set rcvr [new Agent/LossMonitor] # Assign it to node $n2 $ns at 1.2 "$n2 join-group $rcvr $group2" $ns at 1.25 "$n2 leave-group $rcvr $group2" $ns at 1.3 "$n2 join-group $rcvr $group2" $ns at 1.35 "$n2 join-group $rcvr $group1"

  12. Multicast:Step7 • End-of-simulation wrapper (as usual) $ns at 2.0 "finish" proc finish {} { global ns fd close $fd $ns flush-trace puts "running nam..." exec nam out.nam & exit 0 } $ns run

  13. 抽考題目 • 使用DM這個multicast protocol，讓所有node包含multicast protocol agent，並建立一個multicast的group，定義一個udp的agent給group當作multicast的來源端。 • 提供tcl，請依要求補上缺少的code(5行)

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