US Patent No. 9,350,661


Patent No. 9,350,661
Issue Date May 24, 2016
Title Aggregation Network With Centralized Control
Inventorship James M. Murphy, Alameda, CA (US)
Abhijit K. Choudhury, Cupertino, CA (US)
Pradeep Sindhu, Los Altos Hills, CA (US)
Ina Minei, Mountain View, CA (US)
Jayabharat Boddu, Los Altos, CA (US)
Assignee Juniper Networks, Inc., Sunnyvale, CA (US)

Claim of US Patent No. 9,350,661

1. A centralized controller in communication with a plurality of aggregation nodes, edge routers, and access nodes of a network,
wherein the centralized controller comprises:
a topology module that executes a software defined networking (SDN) protocol to receive topology information from the edge
routers, wherein the topology module receives a plurality of messages flooded by one or more of the access nodes and the aggregation
nodes, wherein each respective message of the plurality of messages specifies a respective list of interfaces for the access
nodes and the aggregation nodes traversed by the respective message,

wherein the centralized controller establishes a respective control channel with each of the aggregation nodes based on the
lists of interfaces specified by the messages flooded by the aggregation nodes; and

a path computation module (PCM) that computes forwarding information for one or more transport data channels in accordance
with the topology information, wherein the transport data channels are for transporting network packets between the access
nodes and the edge routers via the aggregation nodes,

wherein the centralized controller outputs one or more messages to the aggregation nodes via the respective control channels
to communicate and install within each of the aggregation nodes the forwarding information for configuring forwarding planes
of the aggregation nodes to forward the network packets on the one or more transport data channels.