Multicast Traffic Monitoring on a Nationwide Backbone Network

Tao HeNew Generation Network (NGN) Lab.

Department of Electronic and EngineeringTsinghua UNIV. P. R. China

hetao@serv.edu.cnAugust 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 ManagementTraffic ManagementPerformance MonitoringCapacity 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-effectiveease of handlingreduce effect on network Better SolutionTraffic 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: unidirectionalendpoint 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.)

Experimental Results (cont.)

Experimental Results (cont.)

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 ?