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Network Engineering Session APAN Conference 2004 in Cairns July 4, 2004

Explore e-VLBI advancements, gigabit sampling, and UT1-UTC experiments. Learn about network configurations, tests, and future upgrades in the VLBI world.

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Network Engineering Session APAN Conference 2004 in Cairns July 4, 2004

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  1. e-VLBI Update and E2E Performance Network Engineering Session APAN Conference 2004 in Cairns July 4, 2004

  2. VLBI (Very Long Baseline Interferometry) • e-VLBI geographically distributed observation, interconnecting radio antennas over the world • Gigabit / real-time VLBI multi-gigabit rate sampling radio signal from a star delay High Bandwidth – Delay Product Network issue A/D clock A/D clock ~Gbps ~Gbps Internet correlator ASTRONOMY GEODESY

  3. Two Recent Experiments of UT1-UTC Estimation • July 23 4am-6am JST (tsev7) Kashima was connected at 100M.NIC hardware error was reported. • July 30 4am-6am JST (tsev8)Kashima was upgraded to 1G through JGN II 10G link.All processing done in ~4.5 hours (last time ~21 hours)Average ~30 Mbps transfer by bbftp (under investigation) test experiment

  4. 1 Gbps 1 Gbps Koganei 12GCF 1 Gbps

  5. e-VLBI Network Configuration (Japan side) KDDI Otemachi JGN II TransPAC 10G GS4000 tpr4 10G GbE MS3 tpr2 GS4000 NICT Kashima (main) 202 GbE x2 U-node L2 NICT Koganei (north) OC192 OC192 Domestic VLBI network JGN II OC48 (ATM) 203.181.248.200/30 OC48+GbE NICTKoganei (south) GbE x2 U-node NICT Kashima (34m) GbE x2 GS4000 50 L2 VLBI L2 vlbi2 GbE GbE x2 49 PRO vlbi-bwctl 201 51 12GCF vlbi-perf1 1 52 2 203.181.194.0/28 koganei-perf1 203.181.194.48/28 3 koganei-perf2 e-VLBI for TransPAC

  6. From Kashima to Washington DC

  7. From Tokyo (perf5) to Washington DC (kame)

  8. Network Diagram for e-VLBI 2004 planand TransPAC/I2 bwctl servers Seoul XP 10G Korea Kashima 100km Daejon bwctl server JGNII KOREN perf server 1G Taegu Tokyo XP 2.5G Kwangju Busan Koganei e-vlbi server 1G 1G 250km 2.5G SONET TransPAC APII/JGNII 1G x2 2.5G Kitakyushu 1,000km 9,000km Cicago MIT Haystack 1G 1G Fukuoka Abilene 2.4G x2 Genkai XP Fukuoka Japan 10G 4,000km New York Los Angeles Indianapolis e-VLBI: • Done 1 Gbps upgrade at Kashima • Planned 2.5 Gbps upgrade at Haystack • Experiments using 1 Gbps and more • Using real-time correlation *Info and key exchange page needed like: http://e2epi.internet2.edu/pipes/ami/bwctl/

  9. E2E Measurement for High Bandwidth-Delay Product Network(backbone ~ access) Scheduled Test: • UDP – not TCP friendly • TCP – Long time to get average (~ 30 minutes) Depends on TCP implementations • TCP peak rate (Slow start) • Available bandwidth • http://mrtg.koganei.itrc.net/mrtg/tcp/ On-Demand Test: • iperf only – difficult to see the reason • iperf (bwctl) with web100 kernel • TCP behavior • http://mrtg.koganei.itrc.net/cgi-bin/web100plot.cgi?server=203.181.194.51

  10. TCP Peak Rate in Japan and Korea Kashima - Tokyo Fukuoka - Tokyo Busan - Tokyo

  11. Plans e-VLBI: • The 3rd e-VLBI WorkshopOctober 6-7, 2004, Makuhari Japan Performance test: • with Internet2/piPES • will be a part of Global Observatory

  12. Backup

  13. bwctl – iperf wrapper Host A Host B iperf iperf Run & response bwctld bwctld Username & password bwctl NTP

  14. APAN JP Maps written in perl and fig2div

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