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

A Virtual Computer Networking Lab

Mike Zink, Max Ott, Jeannie Albrecht

GEC 23,

June 16th 2015

Sponsored by the National Science Foundation 2GEC20

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 3GEC20

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 4GEC20

GENI Technology

• GENI Portal• GENI APIs• GENI Racks• GIMI Tools• LabWiki

Sponsored by the National Science Foundation 5GEC20

LabWiki as a Classroom Tool

Sponsored by the National Science Foundation 6GEC20

LabWiki CoreP

lugi

n

Yo

ur

Plu

gin

GENICH/AM

OMF iRODS YourService

GIMIServices

Plan Prepare Execute

LabWiki Architecture

Sponsored by the National Science Foundation 7GEC20

GENITestBed

OMLServer

LabWiki

iRODS

1.Instrument

2.Run

3.Collect

4.Plot

5.Save

OML Client

6.Obtain Automated

Environment

0.Reserve

Experimenter

2.Run

3.Collect

4.Plot

5.Save

Sponsored by the National Science Foundation 8GEC20

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 9GEC20

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 10GEC20

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 11GEC20

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 12GEC20

Learning Swicth

A

A’

B

B’ C

C’

1 2

345

6

A A’

Source: ADest: A’

MAC addr interface TTL

Switch table (initially empty)

A 1 60

A A’A A’A A’A A’A A’

• frame destination unknown:flood

A’ A

destination A location known:

A’ 4 60

selective send More info in chapter

5 of “Computer Networks”, Kurose & Ross

Sponsored by the National Science Foundation 13GEC20

Assignment Topology

• N1 – N4: regular end systems• Switch: VM with OVS installed

sw-based OF switch• Trema-based OF controller

running on Switch

https://github.com/trema/trema

Goal: Implement learning switch and verify its correct behavior

Sponsored by the National Science Foundation 14GEC20

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 15GEC20

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 16GEC20

Assignment VI – OF Load Balancer

• Teaches programming of OpenFlow controller

• No OpenFlow knowledge required

• Lessons learned: IP routing and forwarding

Total Traffic

Throughput

Sponsored by the National Science Foundation 17GEC20

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 18GEC20

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 19GEC20

For Educators

• Create Experiment Script (OEDL)– Unlimited update

• Create instructions (Wiki)

Sponsored by the National Science Foundation 20GEC20

For Educators

• Auto checking– Custom event trigger– View submissions

Sponsored by the National Science Foundation 21GEC20

Additional Information

• Video that demonstrates new LabWiki features:http://mytestbed.net/attachments/download/1208/LW_Education_1080p.mp4

• Demo tonight!