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Sponsored by the National Science Foundation Using OpenFlow and Orbit to Achieve Mobility in a Heterogeneous Wireless Network Ryan Izard rizard@g.clemson.edu GREE-SC2014 Iowa State University
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Sponsored by the National Science Foundation 2 GREESC2014 Outline 1.A brief overview of software defined networking (SDN) and OpenFlow (OF) 2.OF controller and OF switch software components and interaction 3.The Floodlight (FL) OF controller 4.Achieving IP Mobility with OF 5.Tutorial / Walk-through
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Sponsored by the National Science Foundation 3 GREESC2014 What is Software Defined Networking and OpenFlow?
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Sponsored by the National Science Foundation 4 GREESC2014 Physical separation of network control plane from forwarding/data plane Network control –Centrally managed –Directly programmable Network infrastructure –Abstracted from applications What is SDN?
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Sponsored by the National Science Foundation 5 GREESC2014 Network Operating System API Feature A API Feature B API Feature C Packet Forwarding How Does SDN Work?
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Sponsored by the National Science Foundation 6 GREESC2014 Link between SDN control and infrastructure layers OF-enabled infrastructure communicates with an OF controller via the OF protocol What Is OpenFlow?
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Sponsored by the National Science Foundation 7 GREESC2014 OpenFlow Controller Network Services Custom Services Packet Forwarding User Applications APIs How Does OF Work?
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Sponsored by the National Science Foundation 8 GREESC2014 Basic SDN packet handling example
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Sponsored by the National Science Foundation 9 GREESC2014 User 1 User 2 Basic SDN packet handling example
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Sponsored by the National Science Foundation 10 GREESC2014 User 1 User 2 Basic SDN packet handling example
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Sponsored by the National Science Foundation 11 GREESC2014 OpenFlow Switches and Controllers
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Sponsored by the National Science Foundation 12 GREESC2014 1.Power On 2.Bootloader 3.OF-Enabled OS Data Path / Switching Hardware Control Path OpenFlow Flow Table time Bottom-Up: An OF-Enabled Switch
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Sponsored by the National Science Foundation 13 GREESC2014 Data Path / Switching Hardware Control Path Flow Table OpenFlow Hardware OS (e.g. Linux, Mac, Windows, etc.) Network Services Custom Services APIs OpenFlow Controller (e.g. Floodlight, NOX, etc.) OF Switch Connection to Controller
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Sponsored by the National Science Foundation 14 GREESC2014 Switch probes for controller –Configured with controller IP/port (6633/6653) –Connection established via TCP/TLS –Standalone or secure modes Controller can learn topology –Packet-out LLDP –Devices and other participating OF switches discovered and mapped OF Switch Connection to Controller
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Sponsored by the National Science Foundation 15 GREESC2014 Hardware OS (e.g. Linux, Mac, Windows, etc.) OpenFlow Controller (e.g. Floodlight, NOX, etc.) Hardware OS (e.g. Linux, Mac, Windows, etc.) Interface to Controller (e.g. REST) Application Requesting Controller Service(s) Network Services Custom Services APIs Application Connection to Controller
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Sponsored by the National Science Foundation 16 GREESC2014 Controller-dependent Floodlight provides REST API –JSON –Modify or query running configuration –Expandable with custom modules Options are vast with open-source –Customize controller APIs and behavior –User-application-independent (e.g. a transparent network service like SOS) Application Connection to Controller
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Sponsored by the National Science Foundation 17 GREESC2014 Open-source OF controller Sponsored and supported by Big Switch Networks Written in Java and easily used with Eclipse Modifiable and expandable to suit any application via modules Large developer community and support group The Floodlight OpenFlow Controller
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Sponsored by the National Science Foundation 18 GREESC2014 What is a Floodlight (FL) module? –FL service that reacts to switch/controller events, manages running switches, and/or manages controller configuration –Java package –FL ships with many modules, but custom modules are supported Modules can work collaboratively and be chained to achieve desired results Floodlight Modules
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Sponsored by the National Science Foundation 19 GREESC2014 1.Execute 2.Parse module list 3.Load modules 4.Start REST service 5.Start FL Provider Service (Core) time FL Provider Service FL Modules (e.g. Forwarding, DHCP, Your_Module, etc.) REST Service Floodlight Architecture
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Sponsored by the National Science Foundation 20 GREESC2014 Floodlight Architecture
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Sponsored by the National Science Foundation 21 GREESC2014 Off-the-shelf, the FL controller mimics traditional learning switch behavior for all connected switches Custom modules allow for advanced SDN applications/behaviors –SOS, HetNet Mobility, GENI Cinema, etc. –Add your custom modules here too! REST API allows third party apps to query and modify the running configuration of FL Customizing Floodlight Behavior
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Sponsored by the National Science Foundation 22 GREESC2014 How can Software Defined Networking and OpenFlow be Used to Achieve a Vertical Handover?
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Sponsored by the National Science Foundation 23 GREESC2014 Part I: Design/Setup –Use OpenFlow to perform L2 handoff Part II: Execute –Configure and initialize software and scripts –Execute handoff experiment Part III: Finish –Determine results –Kill processes –Shutdown node and logout
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Sponsored by the National Science Foundation 24 GREESC2014 Provide mobility for clients over IPv4 Entirely SDN and OF-based solution –Network-level Migration detection IP address assignment and management Packet routing –Client-level Packet routing Interface switching Transparent service to application Mobility Over Heterogeneous Networks
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Sponsored by the National Science Foundation 25 GREESC2014 Network-Level, Mobile IP: –Home/Foreign Agents OpenFlow Controller –Mobile IP tunnels OpenFlow flows –DHCP server on OpenFlow controller Client-Level, Vertical Handoff: –Change physical interface broken socket –Open vSwitch + Floodlight OF controller Manage the physical interfaces via SDN End-user sees “always-up” virtual interface Mobility Over Heterogeneous Networks
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Sponsored by the National Science Foundation 26 GREESC2014 Client Connects to WiMAX Client-Level
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Sponsored by the National Science Foundation 27 GREESC2014 Client Connects to WiMAX Network-Level
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Sponsored by the National Science Foundation 28 GREESC2014 Client Uses WiMAX Network Network-Level
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Sponsored by the National Science Foundation 29 GREESC2014 Client Migrates Network-Level
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Sponsored by the National Science Foundation 30 GREESC2014 Client Switches to WiFi Interface Client-Level
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Sponsored by the National Science Foundation 31 GREESC2014 Network Responds to Handover Network-Level
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Sponsored by the National Science Foundation 32 GREESC2014 Client Connection Rerouted to WiFi Network-Level
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Sponsored by the National Science Foundation 33 GREESC2014 Client-Level Mobility Over Heterogeneous Networks
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Sponsored by the National Science Foundation 34 GREESC2014
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Sponsored by the National Science Foundation 35 GREESC2014
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Sponsored by the National Science Foundation 36 GREESC2014 Part I: Design/Setup –Use OpenFlow to perform L2 handoff Part II: Execute –Configure and initialize software and scripts –Execute handoff experiment Part III: Finish –Determine results –Kill processes –Shutdown node and logout
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Sponsored by the National Science Foundation 37 GREESC2014 Configure Experiment Experiment is a simple ping to demonstrate a vertical handoff between a WiFi and a WiMAX interface on a node in the Orbit grid testbed Detailed instructions: –http://groups.geni.net/geni/wiki/GENIExperimenter/Tutorials/ WiMAXOpenFlowhttp://groups.geni.net/geni/wiki/GENIExperimenter/Tutorials/ WiMAXOpenFlow GREE-SC2014 group and node assignments: –http://tinyurl.com/greesc2014-d7-node-infohttp://tinyurl.com/greesc2014-d7-node-info
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Sponsored by the National Science Foundation 38 GREESC2014 Configure Experiment Enable WiMAX for your GENI project –Login to GENI at portal.geni.net –Scroll down to the Tools section and select WiMAX –Select the button to enable WiMAX for your project (GREESC14) –Click Submit –Note your username
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Sponsored by the National Science Foundation 39 GREESC2014 Configure Experiment You should be able to login to the Orbit testbed for your project –eval `ssh-agent –s` –ssh-add /path/to/private/key Open two separate terminal windows and in each SSH to Orbit –ssh username@console.grid.orbit-lab.org
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Sponsored by the National Science Foundation 40 GREESC2014 Configure Experiment Load AP image onto node –omf load -o 1200 -i rizard-greesc2014- ap.ndz -t node11-11 Load Server image onto node –omf load -o 1200 -i rizard-greesc2014- server.ndz -t node10-10 Load Client image onto node –omf load -o 1200 -i rizard-greesc2014- client.ndz -t Power off and boot nodes –omf tell -a offh -t node11-11,node10- 10, –omf tell -a on -t node11-11,node10- 10, Do NOT Complete at GREE- SC2014 It’s Already Been Done For You
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Sponsored by the National Science Foundation 41 GREESC2014 Configure Experiment Setup AP node (Already done for GREE-SC2014) –ssh root@node11-11 –Start:./gec20_setup_ap.sh Setup Server node (Already done for GREE-SC2014) –ssh root@node10-10 –Start:./StartupScripts/gec20_setup.sh –ARP:./StartupScripts/arp_add_list.sh Setup Client node – Your Turn! –ssh root@ –Disable Floodlight’s forwarding module –Configure startup and switching scripts –Start:./StartupScripts/gec20_setup.sh
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Sponsored by the National Science Foundation 42 GREESC2014 Part I: Design/Setup –Use OpenFlow to perform L2 handoff Part II: Execute –Configure and initialize software and scripts –Execute handoff experiment Part III: Finish –Determine results –Kill processes –Shutdown node and logout
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Sponsored by the National Science Foundation 43 GREESC2014 Execute Experiment 1)WiFi flows are installed as “initial flows” when setup script is run. 2)In a new terminal, start a ping to the server IP, 10.41.105.105. The packets will be switched out the WiFi interface. 3)Run the WiMAX switching script. The ping packets will be switched out the WiMAX interface../SwitchingScripts/gec20_switch_to_wimax.sh 4)You’ve performed a handoff! Want proof? View the flows and packet counts on each OVS bridge before and after an interface-switch. 5)Alternate inferfaces and switch back to WiFi../SwitchingScripts/gec20_switch_to_wifi.sh
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Sponsored by the National Science Foundation 44 GREESC2014 Part I: Design/Setup –Use OpenFlow to perform L2 handoff Part II: Execute –Configure and initialize software and scripts –Execute handoff experiment Part III: Finish –Determine results –Kill processes –Shutdown node and logout
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Sponsored by the National Science Foundation 45 GREESC2014 Teardown Experiment When the experiment is done, on the Client node stop the Floodlight controller, stop OVS:./StartupScripts/gec20_teardown.sh On the Server node:./StartupScripts/gec20_teardown.sh Exit all SSH connections to nodes and power off resources: omf tell -a offh -t all Exit Orbit console SSH connections.
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