Patent ID: 9094285
Filing Date: 2015-07-28
Classification: H04L

Abstract:
1. A method for a first controller in a first subnetwork to automatically discover a second controller of a second subnetwork, said first subnetwork further comprising at least a first switch and said second subnetwork further comprising at least a second switch, said method as implemented in said first controller comprising the steps of: a) receiving a message from said first switch identifying activation of a first port, which is due to establishment of a connection between said first port in said first switch and a second port in said second switch; b) generating a Controller-Advertisement message carrying information required to identify and access said first controller; c) forwarding said generated Controller-Advertisement message from said first controller to said first switch, said first port in said first switch further forwarding said Controller-Advertisement message to said second port in said second switch, said second switch further forwarding said Controller-Advertisement message to said second controller along with an identification of said second port over which said Controller-Advertisement message was received; wherein said second controller in said second subnetwork identifies said first controller in said first subnetwork based on said information carried in said Controller-Advertisement message, and said second controller generating a Controller Information Base (CIB) entry containing said information required to identify and access said first controller.