Sponsored by the National Science Foundation A Virtual Computer Networking Lab Mike Zink, Max Ott, Jeannie Albrecht GEC 23, June 16 th 2015

Sponsored by the National Science Foundation 2 GEC20 The “Traditonal” Networks Lab Each institution requires a set of hardware (switches, routers, cables, computers) Hardware outdates fairly quickly Certain aspects are vendor specific Equipment is unused for periods of time

Sponsored by the National Science Foundation 3 GEC20 The “Virtual” Networks Lab Use GENI infrastructure to teach lab Individual institutions don’t need hardware “Guide” students as much as needed Teach new technologies (e.g., OpenFlow) Downside: Students do not touch hardware Approach: Connect local HW to GENI where possible

Sponsored by the National Science Foundation 4 GEC20 GENI Technology GENI Portal GENI APIs GENI Racks GIMI Tools LabWiki

Sponsored by the National Science Foundation 5 GEC20 LabWiki as a Classroom Tool

Sponsored by the National Science Foundation 6 GEC20 LabWiki Core Plugin Your Plugin GENI CH/AM GENI CH/AM OMF iRODS Your Service Your Service GIMI Services PlanPrepareExecute LabWiki Architecture

Sponsored by the National Science Foundation 7 GEC20 GENI TestBed OML Server LabWiki iRODS 1.Instrument 2.Run 3.Collect 4.Plot 5.Save OML Client 6.Obtain Environment 0.Reserve Experimenter 2.Run 3.Collect 4.Plot 5.Save

Sponsored by the National Science Foundation 8 GEC20 Assignment I - Web Server Automatically set up web servers on GENI testbeds, install required programs and provides measurement tools. Web based dynamic Rspec tool,used to scale the number of servers and clients. Will create a topology with the server and client files present inside the respective VMs. OEDL script, which can be used to verify the functionality of the server. Auto-grading for instructors.

Sponsored by the National Science Foundation 9 GEC20 Assignment II - Data-Center Routing Teaches the basics of load balancing for servers in a data-center Algorithm can be round robin, throughput-based or random for routing through the OpenFlow switch Lessons learned: any- casting, how the packet destination is modified for routing, different algorithms for load balancing, data center technology

Sponsored by the National Science Foundation 10 GEC20 Assignment III - Multi-casting Teaches the basics of multicasting Out-of-band signal - used to send “Join” and “Leave” messages to an OpenFlow controller Functionality of the controller is verified through a layer 2 ping Lessons learned: multi- casting protocol, packet duplication, layer-2 ping application

Sponsored by the National Science Foundation 11 GEC20 Assignment IV – Learning Switch Teaches the basics of learning switch functionality used by Ethernet switches Learning switch implementation through Trema controller OEDL script to plot graph Lessons learned: learning switch functionality, using different metrics to plot graphs through labWiki

Sponsored by the National Science Foundation 12 GEC20 Learning Swicth A A’A’ B B’B’C C’C’ A A’ Source: A Dest: A’ MAC addr interface TTL Switch table (initially empty) A 1 60 A A’ frame destination unknown: flood A’ A  destination A location known: A’A’ 4 60 selective send  More info in chapter 5 of “Computer Networks”, Kurose & Ross

Sponsored by the National Science Foundation 13 GEC20 Assignment Topology N1 – N4: regular end systems Switch: VM with OVS installed  sw-based OF switch Trema-based OF controller running on Switch Goal: Implement learning switch and verify its correct behavior

Sponsored by the National Science Foundation 14 GEC20 Methodology Have students go through material in book Provide assignment instructions in LabWiki Provide experiment script in LabWiki that allows verification of learning switch Provide OF controller template for students to complete

Sponsored by the National Science Foundation 15 GEC20 Assignment V – IP Routing Teaches the very basics of IP routing Use ping to verify routing Can be easily extended: –Geographically distributed topology –Build routing mechanisms on top Lessons learned: static IP routing, forwarding, impact of route on RTT

Sponsored by the National Science Foundation 16 GEC20 Assignment VI – OF Load Balancer Teaches programming of OpenFlow controller No OpenFlow knowledge required Lessons learned: IP routing and forwarding

Sponsored by the National Science Foundation 17 GEC20 Assignment VII – DASH Video Teaches how to measure video quality Uses alternative paths to show impact of RTT on video quality Lessons learned: OpenFlow basics, DASH basics, network measurement ExoGENI

Sponsored by the National Science Foundation 18 GEC20 For Students Prepared experiment script (OEDL) –Read-only –Create copy or run as is Assignment –Execute experiment –Generate results –Write comments –Submit

Sponsored by the National Science Foundation 19 GEC20 For Educators Create Experiment Script (OEDL) –Unlimited update Create instructions (Wiki)

Sponsored by the National Science Foundation 20 GEC20 For Educators Auto checking –Custom event trigger –View submissions

Sponsored by the National Science Foundation 21 GEC20 Additional Information Video that demonstrates new LabWiki features: LW_Education_1080p.mp4 LW_Education_1080p.mp4 Demo tonight!