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An Approach to Universal Topology Generation

An Approach to Universal Topology Generation. Alberto Medina Anukool Lakhina Ibrahim Matta John Byers. http://www.cs.bu.edu/brite. Why Topology Generation?. To effectively engineer the Internet Open Question : Are topologies generated by existing models representative of the Internet?

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An Approach to Universal Topology Generation

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  1. An Approach to Universal Topology Generation Alberto MedinaAnukool LakhinaIbrahim Matta John Byers http://www.cs.bu.edu/brite

  2. Why Topology Generation? • To effectively engineer the Internet • Open Question: Are topologies generated by existing models representative of the Internet? • Our contribution is a universal topology generation framework

  3. Main Features of BRITE • Flexible: supports multiple generation models • Extensible: allows adding new generation models • Interoperable: allows use of topologies from other topology generators • Portable: implemented in Java and C++ • User Friendly: provides a GUI and configuration files.

  4. The Big Picture Configuration File (Parameters) SSF NS BRITE BRITE GENERATION Engine + output formats BRITE Min-Hop Paths BRITE ANALYSIS Engine GT-ITM Degree Freq Imported file formats Degree Rank NLANR Path Lengths Skitter

  5. BRITE Architecture Topology Graph Model Export Methods Model n Nodes NS BRITE Edges Model 1 SSF Model 2 ...

  6. BRIANA: The BRITE Analysis Engine • A repository of analysis routines for topologies • Allows researchers to share analysis routines and create benchmarks to compare topologies • Fully integrated with BRITE but can also be used independently

  7. Experimental Results NLANR Topology (04/98) BRITE Topology (Barabási-Albert Model) GT-ITM Topology (Flat)

  8. Visualizing BRITE Topologies A BRITE generated topology (5K nodes, 10K edges) visualized in Otter

  9. BRITE Topologies in Large-Scale Simulations • Large scale topological simulations are vital to verify abstractions and models of the Internet • SSFNet is a high performance (100K multi-protocol hosts and routers) simulation framework. #BRITE topology output to SSFNET’s DML formatNet [ frequency 1000000000 #1 nanosecond time resolution ….#ROUTERS ------------------------------------------------------- router [ id 0 graph [ProtocolSession [name ip use SSF.OS.IP] ProtocolSession [name ospf use SSF.OS.OSPF.sOSPF] ] interface [idrange [from 0 to 3] _extends .dictionary.100BaseT] ] ….#LINKS ------------------------------------------------------- link [ attach 0(1) attach 3760(1) delay 0.0 ] link [ attach 0(2) attach 1898(1) delay 0.0 ] … ] #end of NET Export to SSFNet A BRITE generated topology

  10. Future Directions • Produce annotated topologies • Create Internet Simulation Environments • Develop models for dynamic topologies • Devise a taxonomy of metrics for topology analysis • Use BRITE and BRIANA to evaluate Internet protocols and algorithms

  11. Publications • A. Medina, A. Lakhina, I. Matta, and J. Byers. An Approach to Universal Topology Generation. Submitted to MASCOTS 2001. April, 2001. • A. Medina, I. Matta, and J. Byers. On the Origin of Power Laws in Internet Topologies. ACM Computer Communications Review, April 2000. • A. Medina, I. Matta, and J. Byers. BRITE 1.0: A Flexible Generator of Internet Topologies. BU-CS-TR-2000-005. January 21, 2000. • A. Medina, A. Lakhina, I. Matta, and J. Byers. BRITE: Universal Topology Generation from a User's Perspective. BU-CS-TR-2001-003. April 05, 2001.

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