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 August 2003

Outline 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

Multicast Network Analysis Research K. Claffy at SDSC (Network Measurement) Multicast Traffic Analysis K. Almeroth at UCSB (Mantra) Multicast Routing Information Analysis

What s the problem 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

Basic Idea (cont.) 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

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.

Experimental Results

Experimental Results (cont.)

Where are we going 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 Little demand or large demand? How to monitor and manage? What should that be? What s the next?

Summary (cont.) 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

Thank you Q & A ?