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AS-level Multi-Path Routing

AS-level Multi-Path Routing. Presenter: Adriana Szekeres Vrije Universiteit Amsterdam/NLnet Labs. Contents. Introduction to AS-level multi-path routing Motivation of our work Our work Short presentation The experiments we conduct Preliminary results. Introduction. Introduction.

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AS-level Multi-Path Routing

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  1. AS-level Multi-Path Routing Presenter: Adriana Szekeres Vrije Universiteit Amsterdam/NLnet Labs

  2. Contents • Introduction to AS-level multi-path routing • Motivation of our work • Our work • Short presentation • The experiments we conduct • Preliminary results

  3. Introduction

  4. Introduction

  5. Introduction

  6. Introduction Problem: Disconnectivity during BGP’s convergence

  7. Introduction • AS-level Multi-Path Routing idea: • supply multiple paths • find the most disjoint paths from the one currently used (to cover a wide area of failures). AS-level Multi-Path Routing: nice to have, but it may come at some costs.

  8. Motivation • Number of ASes – almost doubled from 2004 • BGP faces scalability and stability problems

  9. Motivation • Number of ASes – almost doubled from 2004 • BGP faces scalability and stability problems • Reticence to new BGP enhancements

  10. Motivation • Number of ASes – almost doubled from 2004 • BGP faces scalability and stability problems • Reticence to new BGP enhancements Every new BGP addition should be carefully studied and tested

  11. Our work • Study the promises of the recently proposed AS-level multi-path routing methods (2009) • Resilient_BGP • each AS advertise a fail-over path to the AS through which it is routing • Multi-Process_BGP • run multiple BGP instances that advertise disjoint paths

  12. Experiments • Show: • impact on BGP’s scalability • the degree of fault tolerance • BGPsim simulator • can simulate more than 30.000 ASes • ran on DAS-4 cluster; using 33 nodes; 8 cores/node • CAIDA topologies from 2005 to 2010

  13. Preliminary results

  14. Preliminary results 2005 maximum node disjointness

  15. Preliminary results 2009 maximum node disjointness

  16. Conclusion • Importance: • BGP protocol designers and network operators: • impact on scalability • efficiency • Future work • further analyze the routing tables • more methods

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