Advertisement

Humpty Dumpty: Putting iBGP Back Together Again

  • Ashley Flavel
  • Jeremy McMahon
  • Aman Shaikh
  • Matthew Roughan
  • Nigel Bean
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5550)

Abstract

Humpty Dumpty is the anthropomorphic nursery-rhyme egg broken into many pieces. Similarly, we have many pieces of measurement data to represent the current iBGP state. However, unlike the nursery-rhyme where the King’s men couldn’t put Humpty together again, we present a systematic approach to putting all the pieces of measured iBGP data together to obtain a more complete picture of a network’s routing state.

Our technique determines the decisions made by all routers in a network. It is efficient, has no assumptions about router configuration and is accurate. We present a case-study of a large Tier-2 ISP, finding for those routers with adequate measurement infrastructure, we consistently find the egress location for 99.9999% of (router, prefix) pairs. Further, for the 85% of routers without measurement infrastructure we predict their decisions. This technique has been successfully applied in a ‘what-if’ scenario and has future applications in the real-time analysis of routing decisions.

Keywords

iBGP Route prediction 

References

  1. 1.
    Feldmann, A., Greenberg, A., Lund, C., Reingold, N., Rexford, J., True, F.: Deriving Traffic Demands for Operational IP Networks: Methodology and Experience. IEEE/ACM Transactions on Networking (2001)Google Scholar
  2. 2.
    Zhang, Y., Roughan, M., Lund, C., Donoho, D.: Estimating Point-to-Point and Point-to-Multipoint Traffic Matrices: An Information-Theoretic Approach. IEEE/ACM Transactions on Networking 13(5), 947–960 (2005)CrossRefzbMATHGoogle Scholar
  3. 3.
    Teixeira, R., Shaikh, A., Griffin, T.G., Voelker, G.M.: Network Sensitivity to Hot-Potato Disruptions. In: ACM SIGCOMM (2004)Google Scholar
  4. 4.
    Flavel, A., Roughan, M., Bean, N., Shaikh, A.: Where’s Waldo? Practical Searches for Stability in iBGP. In: IEEE International Conference on Network Protocols (2008)Google Scholar
  5. 5.
    Buob, M., Meulle, M., Uhlig, S.: Checking for Optimal Egress Points in iBGP Routing. In: International Workshop on the Design of Reliable Communications Networks (2007)Google Scholar
  6. 6.
    Bates, T., Chandra, R., Chen, E.: BGP Route Reflection - An Alternative to Full Mesh IBGP, RFC 2796 (2000)Google Scholar
  7. 7.
    Feamster, N., Rexford, J.: Network-Wide Prediction of BGP Routes. IEEE/ACM Transactions on Networking 15(2), 253–266 (2007)CrossRefGoogle Scholar
  8. 8.
    Griffin, T., Wilfong, G.: On the Correctness of IBGP Configuration. In: ACM SIGCOMM (2002)Google Scholar
  9. 9.
    Feamster, N., Balakrishnan, H.: Correctness Properties for Internet Routing. In: Forty-third Allerton Conference on Communication, Control, and Computing (2005)Google Scholar
  10. 10.
    Vutukuru, M., Valiant, P., Kopparty, S., Balakrishnan, H.: How to Construct a Correct and Scalable iBGP Configuration. In: IEEE INFOCOM, Barcelona, Spain (April 2006)Google Scholar
  11. 11.
    Buob, M., Uhlig, S., Meulle, M.: Designing Optimal iBGP Route-Reflection Topologies. In: IFIP Networking (2008)Google Scholar
  12. 12.
    Bonaventure, O., Uhlig, S., Quoitin, B.: The Case for More Versatile BGP Route Reflectors, Work in progress, draft-bonaventure-bgp-route-reflectors-00.txt (2004)Google Scholar
  13. 13.
    Poduri, K., Alaettinoglu, C., Jacobson, V.: BST - BGP Scalable Transport. In: NANOG 27 (2003)Google Scholar
  14. 14.
    Caesar, M., Caldwell, D., Feamster, N., Rexford, J., Shaikh, A., van der Merwe, J.: Design and Implementation of a Routing Control Platform. In: Symposium on Networked Systems Design and Implementation (2005)Google Scholar
  15. 15.
    Quoitin, B., Uhlig, S.: Modeling the Routing of an Autonomous System with CBGP. IEEE Network Magazine, Special Issue on Interdomain Routing (2005)Google Scholar
  16. 16.
    Flavel, A.: BGP, Not As Easy As 1-2-3. Ph.D thesis, University of Adelaide (2009)Google Scholar
  17. 17.
    Shaikh, A., Greenberg, A.: OSPF Monitoring: Architecture, Design and Deployment Experience. In: Symposium on Networked Systems Design and Implementation (2004)Google Scholar
  18. 18.
    Mühlbauer, W., Maennel, O., Uhlig, S., Feldmann, A., Roughan, M.: Building an AS-Topology Model that Captures Route Diversity. In: ACM SIGCOMM (2006)Google Scholar

Copyright information

© IFIP International Federation for Information Processing 2009

Authors and Affiliations

  • Ashley Flavel
    • 1
  • Jeremy McMahon
    • 2
  • Aman Shaikh
    • 3
  • Matthew Roughan
    • 1
  • Nigel Bean
    • 1
  1. 1.School of Mathematical SciencesUniversity of AdelaideAustralia
  2. 2.TRC Mathematical ModellingUniversity of AdelaideAustralia
  3. 3.AT&T Labs - ResearchUSA

Personalised recommendations