1 / 29

NS-2 Tutorial - Part 2 -

NS-2 Tutorial - Part 2 -. Choe, Hyun Jung (Stella) Spring 2008 Networks II Department of Computer Science and Engineering The University of Texas at Arlington. GTA Office Hours. Mon day and Thu rsday 2:30 PM ~ 3:30 PM NH 239 choe@uta.edu. Outline. Simulation Examples

rocco
Download Presentation

NS-2 Tutorial - Part 2 -

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NS-2 Tutorial - Part 2 - Choe, Hyun Jung (Stella) Spring 2008 Networks II Department of Computer Science and EngineeringThe University of Texas at Arlington

  2. GTA Office Hours Monday and Thursday 2:30 PM ~ 3:30 PM NH 239 choe@uta.edu

  3. Outline • Simulation Examples • Visualization: nam, xgraph • Analysis example: awk • Project • Overview • Submission Guideline • Q & A

  4. Simulation Examples

  5. simple.tcl #Create a simulator object set ns [new Simulator] #Open the NAM trace file set nf [open out.nam w] $ns namtrace-all $nf # Open trace file set tf [open out.tr w] $ns trace-all $tf

  6. #Define a 'finish' procedure proc finish {} { global ns nf $ns flush-trace #Close the trace file close $nf exit 0 }

  7. #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

  8. #Setup a TCP connection set tcp [new Agent/TCP] $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

  9. #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

  10. #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"

  11. #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

  12. TCP: Default Parameters # max bound on window size Agent/TCP set window_ 100 # congestion windows Agent/TCP set cwnd_ 10 # initial/reset value of cwnd Agent/TCP set windowInit_ 1 # MSS size Agent/TCP set packetSize_ 1500

  13. NAM #Define a 'finish' procedure proc finish {} { global ns nf $ns flush-trace #Close the trace file close $nf #Execute NAM on the trace file exec nam out.nam & exit 0 }

  14. awk Set awkCodeTr { if ( NF == 12 ) { event =$1 time = $2 if (event = “d”) { dropCount += 1; print time, dropCount >> “drop.a”; } } }

  15. XGRAPH • execxgraph -bb -tk -x time -y lossRatio -bg White -geometry 540x405 /tmp/team3/fs.xg &

  16. Using Variables set testTime 60.0 …… …… …… $ns at $testTime “$cbr0 stop” $ns at $testTime “$cbr1 stop” $ns at $testTime “tcp stop” $ns at [expr $testTime + 1.0] “finish”

  17. DiffServ • To provide QoS by dividing traffic into different categories, scheduling packetsaccordingly • Major components • Policy • Edge router • Core router • Implementation • virtual queues, causing packets from one virtual queue to be dropped morefrequently than packets from another.

  18. DiffServ Configuration • $dsredq set numQueues_ 1 • $dsredq setNumPrec 2 • $dsredq configQ 0 1 10 20 0.10 • $dsredq setSchedularMode WRR • $ns simplex-link $edge $core 10Mb 5ms dsRED/edge • $ns simplex-link $core $edge 10Mb 5ms dsRED/core

  19. # Set DS RED parameters from Edge to Core: set qEC [[$ns link $edge $core] queue] $qEC meanPktSize $packetSize $qEC set numQueues_ 1 $qEC setNumPrec 2 $qEC addPolicyEntry [$s1 id] [$dest id] TokenBucket 10 $cir0 $cbs0 $qEC addPolicyEntry [$s2 id] [$dest id] TokenBucket 10 $cir1 $cbs1 $qEC addPolicerEntry TokenBucket 10 11 $qEC addPHBEntry 10 0 0 $qEC addPHBEntry 11 0 1 $qEC configQ 0 0 20 40 0.02 $qEC configQ 0 1 10 20 0.10

  20. # Set DS RED parameters from Core to Edge: set qCE [[$ns link $core $e1] queue] $qCE meanPktSize $packetSize $qCE set numQueues_ 1 $qCE setNumPrec 2 $qCE addPHBEntry 10 0 0 $qCE addPHBEntry 11 0 1 $qCE configQ 0 0 20 40 0.02 93 $qCE configQ 0 1 10 20 0.10

  21. Project

  22. Phase 1 • Purpose • To be familiar with NS2 • To master how to configure network topology • Steps • Setup system environment • Run specified two example files • Establish specified network topology • Establish traffic flows • Submit your file • You are free to experiment various parameters if your simulation satisfies requirements, specified topology and traffic flows!

  23. Phase 2 • Purpose • To know how to trace/monitor/analyze simulation results • To understand different characteristics of TCP and UDP congestion control • Requirements • Simulate your program with specified parameter values • Generate result graphs to verify the performance • Compare and analyze the results • Make a comprehensive analysis report

  24. Host 1 Host 4 Host 2 Host 5 Host 3 Host 6 R2 R1 R4 R5 R6 R3 2 Mbps, 10ms 1 Mbps, 10ms 5 Mbps, 5/10ms Topology

  25. Phase 3 • Purpose • To help the student master the concepts and practices quality of service (QoS) and traffic management • Requirement • Use Differentiated Service modules • Try to satisfy specified QoS requirements

  26. Phase 4 • Purpose • To help the student master the concepts and practices of traffic engineering • To compare and analyze the relationship of measured performance metrics • Requirement • Measure additional QoS metrics • Compare the results

  27. Submission Format • Analysis Report • *.ps or *.pdf • Readme • *.txt • phase#_last name.* • phase4_choe.tcl, phase4_choe.ps, phase4_choe.tar.gz

  28. Compression • mkdir phase1 • cp files phae1 • tar –cvf project.tar ./phase1 • gzip phase1.tar • phase1.tar.gz • choe@uta.edu • Please DO NOT include trace files!

  29. Hard Deadline • Hard copy • to Gergely Záruba prior to the beginning of class on the due date • Soft copy • to choe@uta.eduprior to the beginning of class on the due date • Late submissions will receive 10% (of the total possible grade) deduction. They will also be amortized 20% (of the total possible grade) each day after the assignment was due.

More Related