Hierarchical Software-Defined Network Traffic Engineering Controller

摘要

Hierarchical Software Defined Network (SDN) architectures can be used to reduce complexity of traffic engineering in large or divers network environments. In hierarchical SDN architectures, a network is sub-divided into multiple regions, and each region is assigned to a different SDN controller. Network status information is collected and consolidated at a regional level, and fed upstream through the SDN control plane until it reaches a root SDN controller. The root-SDN controller computes cost-based parameters, which are distributed to regional SDN controllers for local provisioning. The cost-based parameters can include Lagrangian variables estimations or other parameters that constrain regional traffic engineering optimization in a manner that advances global traffic engineering objectives.

主权项

1. A method for operating hierarchical software defined network (SDN) controllers, the method comprising:
receiving, by a parent SDN controller, regional information from one or more child SDN controllers, wherein each of the one or more child SDN controllers are assigned a different region in a domain assigned to the parent SDN controller; computing cost-based parameters in accordance with the regional information; and sending, by the parent SDN controller, the cost-based parameters to the one or more child SDN controllers, wherein the cost-based parameters are configured to be used in performing distributed network resource allocation in each of the different regions of the domain.