Hi all, By definition: When an OpenFlow switch receives a packet for the first time, for which it has no matching flow entries, it sends this packet to the controller. The controller then makes a decision on how to handle this packet.
But, can someone please clarify how does an OpenFlow controller (say NOX) detect an OpenFlow switch (before it sends its first packet to the controller) ? Precisely, let's say there is a network that comprises of 2 openflow switches that are attached to NOX. Now, to this exisitng network topology, when a third switch moves into it, what happens ( from the controller side and/or switch side) unless this third switch sends its first packet to the controller? Thanks in advance, Daniel
