Transcript Statistical Characteristics of Multicast Traffic on a

Multicast Traffic Monitoring on a
Nationwide Backbone Network
Tao He
New Generation Network (NGN) Lab.
Department of Electronic and Engineering
Tsinghua UNIV. P. R. China
[email protected]
August 2003
Outline
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Overview
Multicast Network Analysis Research
Basic Idea
Our Feature
Experimental Results
Where are we going
Summary
Overview
Deployment of IP Multicast in CERNET
PIM-SM, MBGP, MSDP
 Multicast Network Management
Traffic Management
Performance Monitoring
Capacity Planning
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Multicast Network Analysis
Research
K. Claffy at SDSC (Network
Measurement)
Multicast Traffic Analysis
 K. Almeroth at UCSB (Mantra)
Multicast Routing Information Analysis
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What’s the problem
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High Speed ? (what about 1000Mbps)
Router Affected ? (Performance
Influence to Router)
Too much Information means no
information (We could not handle)
What we want ?
Basic Idea
What’s important to us ?
cost-effective
ease of handling
reduce effect on network
 Better Solution
Traffic Analysis at coarse-grained level
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Basic Idea (cont.)
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Aggregate the packet for generating
small data sets – reduce the demand on
storage
Ignore some flow attributes to reduce
the complexity of post-processing –
considering the essence of multicast
traffic
Our Feature
Stream exists during a specified time
internal when traffic activity happens
 Three aspects:
directionality: unidirectional
endpoint granularity: host, IP block etc.
functional layer: based on transmission
protocols
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Our Feature (cont.)
More about the information of the
concept:
“A methodology for Analyzing Backbone
Network Traffic at Stream-Level”, Tao
He, Hui Zhang, Xing LI etc., ICCT’03,
Beijing P. R. China, April 2003.
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Experimental Results
Experimental Results (cont.)
Experimental Results (cont.)
Experimental Results (cont.)
Experimental Results (cont.)
Where are we going
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Develop the measurement system for
monitoring gigabyte Ethernet links
fine-grained and coarse-grained
analysis
Combination with multicast routing
information
Others (monitoring tools, security etc.)
Summary
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Little demand or large demand?
How to monitor and manage?
What should that be?
What’s the next?
Summary (cont.)
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Statistical Characteristics of IP Multicast
in CERNET shows that we should need
understand the essence of multicast
More tools adaptive to monitor
multicast network should be paid more
attention
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Thank you
Q&A?