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Assignment #2

Assignment #2. Due Sunday Sept 17, 11:55pm. Objectives. Getting to know ns-2 Manipulate ns-2 as a black box. Configure/Script & run simulations based upon pre-existing ns-2 modules for Transport (TCP, UDP), and Queueing/buffer management (deficit round robin scheduling, FIFO DropTail)

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Assignment #2

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  1. Assignment #2 Due Sunday Sept 17, 11:55pm

  2. Objectives • Getting to know ns-2 • Manipulate ns-2 as a black box. • Configure/Script & run simulations based upon pre-existing ns-2 modules for • Transport (TCP, UDP), and • Queueing/buffer management (deficit round robin scheduling, FIFO DropTail) • Collect and interpret results from simulation • Understand what it means to say that scheme A is better than scheme B using simulation evidence. Shivkuma@ecse.rpi.edu

  3. Assignment #2 • Scenario: TCP/UDP bandwidth sharing analysis 1Mbps, 5ms n0 CBR/UDP, 0.1s ~ 5.0s 600Kbps, 10ms n3 n2 FTP/TCP, 0.1s ~ 5.0s 1Mbps, 5ms • DropTail • DRR n1 • TCP is expected to get a lower allocation when FIFO Droptail is used at n2. • Show this using ns-2 simulation. Shivkuma@ecse.rpi.edu

  4. Contd… • By using Deficit Round Robin (DRR) scheduling, we expect to isolate UDP from TCP • This should lead to a fairer bandwidth allocation than FIFO DropTail. • Show this using ns-2 simulation Shivkuma@ecse.rpi.edu

  5. Submission • Write ns2 script for each case (FIFO droptail & DRR) using the topology shown on Slide 3. • Metric: Percentage of link n2-n3 bandwidth obtained by TCP and UDP respectively. • Measure this using ns2 traces (the .tr file) & process it using a Perl/Awk script. • Repeat for the two cases (FIFO DropTail and DRR). • Submit: • Ns2 simulation script; • Post-processing program to process the trace (eg. Awk, perl, etc.); • Your analysis of capacity sharing at bottleneck link n2n3 of TCP and UDP sources, compared to what one would expect in each case. • All in text format. • Due Sunday Sept 17, 11:55pm Shivkuma@ecse.rpi.edu

  6. GRADUATE STUDENTS: Additional Task • Browse the ns-2 manual and David Harrison’s graphing tutorial. You need to be very comfortable with ns-2 for your research project. • ns-2: Briefly discuss the different ways in which the oTcl portion of ns-2 interfaces with the C++ portion (hooks, bindings, tracing, shadow objects, command methods, embedded tcl, instvar etc). • Graphing/Animation: Give an example of when animation more useful in eliciting performance information than what is possible with a collection of graphs? Vice-versa: when would you prefer graphs to animations? • Models: Briefly summarize the various model options available in ns-2 at the transport layer, application layer, routing layer and queue layer. Shivkuma@ecse.rpi.edu

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