Adaptive routing for asymmetrical topologies

A system comprising:

• a communication network comprising a controller and two or more switches, wherein:
• the communication network comprises, for each of the two or more switches, a set of routing paths from the switch to a destination node;
• the set of routing paths comprise:
• a first subset of routing paths converging at a node between the switch and the destination node;
• and
• a second subset of routing paths;
• and
• the controller allocates a data flow to a first routing path of the first subset of routing paths and a second routing path of the second subset of routing paths according to a target data flow rate common to the first routing path and the second routing path.

A method comprising:

• for each of two or more switches of a communication network:
• identifying a set of routing paths from the switch to a destination node based on a topology associated with the communication network, wherein the set of routing paths comprise a first subset of routing paths and a second subset of routing paths, and the topology comprises an indication of a convergence of the first subset of routing paths at a node between the switch and the destination node;
• and
• allocating a data flow to a first routing path of the first subset of routing paths and a second routing path of the second subset of routing paths according to a target data flow rate common to the first routing path and the second routing path.