Network Engineering Session APAN Conference 2004 in Cairns July 4, 2004
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Transcript of Network Engineering Session APAN Conference 2004 in Cairns July 4, 2004
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Network Engineering SessionAPAN Conference 2004 in Cairns
July 4, 2004
e-VLBI Update and E2E Performance
Masaki Hirabaru David Lapsley Yasuhiro Koyama
NICT KoganeiJapan
MIT Haystack Observatory, USA
NICT KashimaSpace Center, Japan
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VLBI (Very Long Baseline Interferometry)de
lay
radio signal from a star
correlator
A/D clockA/D
Internet
clock
•e-VLBI geographically distributed observation, interconnecting radio antennas over the world
•Gigabit / real-time VLBI multi-gigabit rate sampling
High Bandwidth – Delay Product Network issue
ASTRONOMYGEODESY
~Gbps~Gbps
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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
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e-VLBI Network Configuration (Japan side)
NICT Koganei (north)
12GCF
TransPAC
OC192
GS4000
L2
203.181.248.200/30
203.181.194.48/28203.181.194.0/28
U-node
JGN IIJGN II
NICTKoganei (south)
KDDI Otemachi
GbE x2
OC48 (ATM)
L2
NICT Kashima (34m)
GbE x2
e-VLBI for TransPAC
U-node
Domestic VLBI network
OC48+GbE
L2
GbE x2
VLBI
1
vlbi2
vlbi-perf1
vlbi-bwctl
50
51
52
GbEGbE x2
koganei-perf1
koganei-perf2
2
3
GS4000
GS4000
49
201
202MS3 tpr2
OC192
GbE10G
tpr410G
PRO
JGN IIJGN II
NICT Kashima (main)
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From Kashima to Washington DC
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From Tokyo (perf5) to Washington DC (kame)
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KwangjuBusan
2.5G
Fukuoka
Korea
2.5G SONET
KORENTaegu
Daejon
10G
1G1G
1G
Seoul XP
Genkai XP
Kitakyushu
Kashima
1G
Fukuoka Japan
250km
1,000km2.5G
TransPAC
9,000km
4,000km
Los Angeles
Cicago
New York
MIT Haystack
10G
2.4G x2
APII/JGNII
Abilene
Koganei
1G
Indianapolis
100kmbwctl server
Network Diagram for e-VLBI 2004 planand TransPAC/I2 bwctl servers
1G x2
Tokyo XP
*Info and key exchange page needed like:http://e2epi.internet2.edu/pipes/ami/bwctl/
perf server
e-vlbi server
– Done 1 Gbps upgrade at Kashima
– Planned 2.5 Gbps upgrade at Haystack– Experiments using 1 Gbps and more – Using real-time correlation
JGNII
e-VLBI:
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E2E Measurement for High Bandwidth-Delay Product Network(backbone ~ access)
• 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/
Scheduled Test:
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
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TCP Peak Rate in Japan and Korea
Kashima - Tokyo
Busan - Tokyo
Fukuoka - Tokyo
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Plans
•The 3rd e-VLBI WorkshopOctober 6-7, 2004, Makuhari Japan
e-VLBI:
Performance test:• with Internet2/piPES
• will be a part of Global Observatory
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Backup
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bwctl – iperf wrapper
bwctld bwctld
bwctl
Host A
iperfiperf
Username &password
Run &response
Host B
NTP
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APAN JP Maps written in perl and fig2div