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Next-Gen Network Measurement: HOPI Case Study

This presentation discusses the need for measurement and monitoring in next-generation networks, using the HOPI testbed as an example. It explores specific metrics, tools, and techniques for measuring network performance and offers suggestions for future research and collaboration.

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Next-Gen Network Measurement: HOPI Case Study

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  1. {“Next-Generation” Network} Measurement BoF Matt Zekauskas matt@internet2.eduVancouver Joint Techs19-July-2005

  2. Outline • My view of the problem in general • Tease out some specifics • HOPI as an example • …discussion throughout… • What do you do / What do you think? • (Is there anything Internet2 should be doing?)

  3. My view…

  4. “Next Generation”? • Looking at not-too-distant service offerings, based on • NLR L1 / L2 • Connections facilitated by Dragon / Cheetah… • Connections using the GLIF • HOPI • Ultralight, UltraScienceNet, …  circuits

  5. What should we do to measure these networks? • Operational planning • Debugging • Feedback to the control plane

  6. If you’re a RON • What are you doing today?

  7. Specifics…

  8. Measurement/Monitoring:A loss of functionality? • divide-and-conquer by adding active equipment • Statistics from routers (utilization, malformed data packets) • Convenient points for passive traces  A loss of visibility (personal bias: debugging performance problems)

  9. What can you get from L1? • Errors / errored frames • And ?

  10. If you live in an Ethernet world • Utilization • Errors • Possibility of injecting traffic parallel to other VLANs • Possibility of passive measurement by port replication • Packets tossed because of internal resource limits?

  11. What are the right metrics? • Use IP-based ones (packet oriented) • Latency • Loss • Throughput verification • Use telephony-based ones • Circuit setup time • Errored seconds • Whatever the ITU has been doing for years (need to investigate, don’t have any kind of systematic or exhaustive list)

  12. What are the right tools? • Could some passive measurement architecture, such as Lambdamon or PIANO, get us back some visibility?

  13. HOPI as an Example

  14. HOPI • As a testbed, it lives (mostly) in an Ethernet world • 10GE on NLR northern route • 10 or 1 GE to connectors • Can leverage Force10 switches • However • Can optically bypass Force10 • Southern route might be OC192

  15. Initial Thoughts • Collect control plane decisions (with reasoning?): state • Can query devices for “true state” • Collect link error indications • Use IP metrics • Pretest circuits before handoff (won’t catch end interfaces) • Leverage Force10 and collect utilization

  16. Initial Plan • Collect control plane decisions • Leverage Force10 statistics • “Router proxy” to examine switch state • Measurement machines • continuously/periodically… • signal network • measure resulting path (throughput, latency) • Cycle through full mesh of 5 HOPI nodes (will initially, at least, pre-compute schedule) • Exercise control plane as much as verifying circuits

  17. If you operate in this space • What do you do? • Two years from now, what do you wish the Internet2 measurement community had started working on in 2005?

  18. Follow on • The measurement SIG (nee WG) list is appropriate to start, we can create something more specific if it becomes necessary. • wg-measurement@internet2.edu • Subscribe via:https://mail.internet2.edu/wws/info/wg-measurement

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