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Measurements on Layer 2 and OpenFlow Paths

Measurements on Layer 2 and OpenFlow Paths. Prasad Calyam , Ph.D. (PI) Arunprasath Selvadhurai , Sudarshan Rajagopalan , Saravanan Mohan Progress Update @ GEC14, July 2012. Infrastructure Measurement Slices in GENI. Conducting I&M related experiments on:

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Measurements on Layer 2 and OpenFlow Paths

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  1. Measurements on Layer 2 and OpenFlow Paths Prasad Calyam, Ph.D. (PI) ArunprasathSelvadhurai, SudarshanRajagopalan, Saravanan Mohan Progress Update @ GEC14, July 2012

  2. Infrastructure Measurement Slices in GENI • Conducting I&M related experiments on: • Monitoring GENI backbone and access networks carrying non-IP traffic • Monitoring of OpenFlow networks (“plastic slices”) • Using “OSU VMLab – Utah Emulab” VLAN as a testbed for experiments • End-to-end Path: OSU – OARnet– Internet2/NLR Meso-scale Backbone – Utah • Virtual Desktop Cloud (VDC) experiment slice was setup along with a parallel I&M slice using perfSONAR tools and OnTimeMeasure • Experiment slice was setup before GEC13 and has been active for experimentation; I&M slice functional since April • Use Cases • Run active measurements to check connectivity and performance as part of Layer 2/OpenFlowslice monitoring • Schedule experiment and active measurement traffic in a conflict-free manner, and use measurement intelligence for adaptation (e.g., load balancing)

  3. Experiment Slice Setup Details • Multi-domain federation involved in slice setup • OARnet domain (VLAN 1750) from OSU VMLab connected to Washington OpenFlow-enabled switch – verified connectivity using MAC address tables VLAN MAC ADDRESS TYPE INTERFACE 1750    000e.0c67.836e    DYNAMIC     Gi1/0/14 (from VMLabData Center) 1750    0012.e222.6fe6     DYNAMIC     Gi1/0/26 (from Washington Switch) • NLR and Internet2 domains providing Layer 2 connectivity (VLAN 3716) through the OpenFlowbackbone network across GENI • OpenFlowconnectivity between the OSU VMLab, and Utah data centers with the thin-clients (WAPG nodes) is enabled by making them part of TangoGENI’sOpenFlow VLAN 3716 in the IP subnet 10.42.116.x • NOX network controller was setup at pc32.emulab.net at Utah Emulab

  4. OSU VMLab – Utah EmulabTestbed

  5. Parallel I&M Slice Topology

  6. I&M Slice Setup Details • Evaluated setup of LAMP (custom linux image for GENI) for GENI nodes and perfSONAR-ps (Knoppix bootable CD image) for VMLab node • LAMP not supported on all node types in GENI – PG machine setup failed; in such cases we installed BWCTL and OWAMP tools separately “*** Node mapping precheck failed!*** Node mapping precheck failed! *** ERROR: mapper: Unretriable error. Giving up. seed = 1336171786 …………… …………… “Type precheck passed.   *** No possible mapping for pg51        OS 'GeniSlices/UBUNTU91-LAMP' (OS-2283) does not run on this hardware type! *** Node mapping precheck failed!”

  7. Test Scenarios • Run ‘IP Ping’ and ‘Layer 2 Ping’ to check connectivity • Investigate utility of Layer 2 tools (Layer 2 Ping or pingPlus, ARPing) compared to traditional IP Ping tool • Run VDC application on ‘OpenFlownetwork’ path and compare performance with ‘Internet’ path • Investigate improved performance of video stream playback and GUI application control due to Layer 2 paths • Run VDC application and measurement tools in ‘concurrent’ and ‘exclusive’ modes and compare performance • Motivate need for meta-scheduler in perfSONAR to integrate with experiment applications • Run VDC application ‘with’ and ‘without’ load balancing enabled with OpenFlow controller and compare performance • Motivate need for ‘routing engine’ and ‘service delivery’ capabilities of OpenFlow for Future Internet applications

  8. Test Scenario-2 Paths Evaluated Internet Path OpenFlow Network Path

  9. Test Scenario-2 Application Measurements GUI Applications consume more bandwidth and take higher task time in Internet path Video Applications consume more bandwidth and provide higher video quality in OpenFlow path

  10. Test Scenario-3 BWCTL Measurements • Ran VDC application and BWCTL TCP tool in ‘concurrent’ and ‘exclusive’ modes and compared performance (pg51 node results below) Application measurement resumed

  11. Conclusion • Lessons learnt • I&M needs to be a parallel slice for the experiment • Multi-domain Layer 2 connectivity testing is challenging and troubleshooting requires collaboration • Impact of I&M can be seen on the experiment if measurement conflict scheduling occurs • Sample OpenFlow slice RSpecs from GPO are helpful • Next steps to improve GENI I&M frameworks • Need to integrate ‘Meta-scheduler’ to orchestrate active measurements and multi-experiment traffic • Need to have easier methods for experimenters to: • Integrate application metrics (e.g., VDC experiment application) • Provide OpenFlow slice traffic visibility (e.g., topology visualization, interface configuration, interface/flow statistics)

  12. Thank you for your attention!

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