US 11,750,502 B2
Detection of in-band software defined network controllers using parallel redundancy protocol
Tristan Lloyd Mullis, Pullman, WA (US); and Rhett Smith, Odessa, FL (US)
Assigned to Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed by Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed on Sep. 1, 2021, as Appl. No. 17/463,874.
Prior Publication US 2023/0066212 A1, Mar. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 45/24 (2022.01); H04L 45/74 (2022.01); H04L 9/40 (2022.01)
CPC H04L 45/24 (2013.01) [H04L 45/74 (2013.01); H04L 63/0227 (2013.01); H04L 63/166 (2013.01); H04L 63/20 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system operable to identify an in-band controller operating on a host in a software defined network (SDN), the host configured to use a parallel redundancy protocol (PRP), the system comprising:
a network in communication with the host, the network comprising a plurality of switches interconnected with a plurality of physical links; and
the in-band controller in communication with the network, the in-band controller comprising:
a PRP identification subsystem to:
generate at least one packet configured such that the network forwards the packet back to the in-band controller; and
analyze the at least one packet and determine that the packet conforms to PRP;
identify a first communication host in communication with the network and configured to operate using PRP; and
a traffic routing subsystem to create a plurality of PRP communication flows between the in-band controller and the first communication host.