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Topology Discovery Correlating different network topology layers in heterogeneous environments Diederik Vandevenne Dennis Pellikaan February 8, 2013 Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 1 / 13

  1. Topology Discovery Correlating different network topology layers in heterogeneous environments Diederik Vandevenne Dennis Pellikaan February 8, 2013 Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 1 / 13

  2. Introduction Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 2 / 13

  3. Research question What are the challenges with the correlation of physical topology information based on LLDP and logical topology information? Working hypotheses LLDP is mature enough and widely implemented, which makes it a useful protocol for topology discovery in heterogeneous network environments All information needed to correlate the different network topology layers is available in the Management Information Base Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 3 / 13

  4. Link Layer Discovery Protocol LLDP Data Unit Chassis ID Port ID Time to Live Optional fields End of LLDPDU Operation modes Send only Receive only Send and receive Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 4 / 13

  5. Topology based on LLDP Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 5 / 13

  6. Ethernet with STP Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 6 / 13

  7. VLANs Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 7 / 13

  8. IP Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 8 / 13

  9. Complete Topology Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 9 / 13

  10. Implementation Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 10 / 13

  11. Findings Maturity of LLDP at SURFsara 124 devices 83% supports LLDP 9% does not support LLDP 8% unknown NOT all relevant information for topology discovery can be retrieved from standardized management information base objects Not all standardized MIB objects are supported by all vendors Some information can only be retrieved from proprietary MIB objects Device IDs (ChassisID, IP address) must be unique Layer two path finding might be needed to create a correct IP layer topology Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 11 / 13

  12. Conclussions Challenges of topology discovery LLDP is mature enough and widely implemented, which makes it a useful protocol for topology dis- covery purposes in heterogeneous network environ- ments All information needed to correlate the different network topology layers is available in the man- agement information base Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 12 / 13

  13. Questions? Diederik Vandevenne, Dennis Pellikaan Topology Discovery February 8, 2013 13 / 13

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