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#class_note

SDN_concept

Practical Challenges

  • Scalability The controller needs to be responsible for many switches
  • Response time
  • Reliability The network should survive the failures of the controller and switches
  • Consistency If multiple controllers are used at the same time, they should behave consistently
  • Security Network vulnerable to attacks on the controller
  • Interoperability Should be able to co-work with legacy switches during transition period

OpenFlow

LBP: Learning Bridge Protocol

LLDP: Link Layer Discovery Protocol

Flow modify ->
controller packet out to add LLDP flows with output action ->
switch packet in to controller with LLDP response ->
spanning tree (keep alive!)