###Ryu Controller to implement controller,which prints out SPF table, between the switches, on any PacketIn Components like advertising or change in network topology. ###Algorithm:

• Controller continously collects data on all switches and ports connected.
• Controller runs LLDP checks on all and any topology changes.
• Right after any new LLDP updates parsed an SPF algorithm (Dijkstra, Bellman-Ford,or any other) is run on the data.
• SPF output is stored as well as printed out.

###Reference 1)Simple implementation of floyd-warhsall algorithm in Python https://gist.github.com/Ceasar/2474603

2)Class Notes mycontroller4.py from MyDrive https://www.dropbox.com/sh/9473n90i6o8e5of/AABvnngHL-HDfdu1k74ospY_a?dl=0