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Distributed Monitoring
CERNET's experience
Xing Li
2004-07-03
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CERNET Transport Network
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CERNET IP Backbone
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CERNET Statistics
38 GigaPops distributed in 36 cities, covering all the provinces in Mai
nland China.
– 11 national Pops are connected via multiple 2.5Gbps DWDM links
– 27 provincial Pops are connected via multiple 155Mbps SDH links
1,500 education and research institutions connected
– 300 campus networks connect to their nearest Pops via 100Mbps-1Gbps li
nks.
– 15 million users
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CERNET Distributed Measurement
Provide the high performance, reliable IP
backbone service
Survive from the network attack
Run based on self-funded model
Protect mission critical applications
produce research data
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Comparison of Current Data and Tools
Netflow Owamp (One-Way Latency) Iperf Traceroute SNMP Interface Statistics Internet2 Detective Multicast Beacon NTP Stratum 2 Server Ping/Traceroute V6 Destination
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Current Tools and Analysis Throughput
– SNMP interface
– passive monitoring
– httpd+wget
Delay and Loss– ICMP
Top 20– passive monitoring
Multicast– Beacon
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Passive Monitoring
R2.112410
R20.16509
M2.1
s
M2.2
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Performance
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Loss vs. Delay
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CERNET HTTP Performance
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Top20 Histogram
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Multicast Beacon Monitoring
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Correlation Analysis
Delay Matrix
Loss Matrix
Combined Pop Monitoring
Committed bandwidth http performance
Top 20 Warning
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CERNET Delay Matrix
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CERNET Loss Matrix
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Pop Monitoring
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Committed bandwidth http performance
Global Internet
CERNET
Cx
20M
1G
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Top20 Monitoring
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Other Tools and Activities Iperf NTP DNS BGP tcping Out of Order Packet Video Conference CCERT
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NTP
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Address and Domains Report
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IPv4/IPv6 BGP Analysis
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tcping
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Multicast Video Conference
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CCERT
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Comparison (1)
Netflow Owamp (One-Way Latency) Iperf Traceroute SNMP Interface Statistics Internet2 Detective Multicast Beacon NTP Stratum 2 Server Ping/Traceroute V6 Destination
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Comparison (2) Collection Today:
– Iperf (Throughput)– OWAMP (1-Way Latency, Lo
ss)– SNMP Data– Anonymized Netflow Data– Per Sender, Per Receiver, Per
Node Pair– IPv4 and IPv6
Collection in the Future– NTP (Data)– Traceroute– BGP Data– First Mile Analysis
Correlation Today:– “Worst 10” Throughputs
– “Worst 10” Latencies Correlation in the Future:
– 99th Percentile Throughput over Time
– Throughput/Loss for all E2E paths using a specific link
– Commonalities among first mile analyzers
– Sum of Partial Paths vs. Whole Path
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Comparison (3) Analysis Today:
– Throughput over Time
– Latency over Time
– Loss over Time
– Worrisome Tests? (Any bad apples in “Worst Ten”?)
– “Not the Network” (If “Worst Ten” is good enough)
Analysis in the Future:– Latency vs. Loss– How good is the network?– Do common first mile
problems exist?– Does a link have problems
that only manifest in the long-haul?
– Is the network delivering the performance required by a funded project?
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Future Work Expend to the CERNET member universities IPv6 New Tools Data library International collaboration
– APAN
– Abilene Observatory
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