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There are couple of steps to achieve the loadbalancer

1) Get the topology of the network 2) get the links between the nodes 3) for each link calculate the load, basically the link utilisation 4) do large flow detect by comparing to your threshold values. 5) for a link with high load, check if there is an alternative path using one of the routing algorithms 6) find the new path 7) program the flow table on the switch 8) the above steps can be done in while loop with some sleep

This is a simple loadblancer you can start with. use topology, routing interfaces.