METHOD AND SYSTEM FOR LOAD BALANCING IN A SOFTWARE-DEFINED NETWORKING (SDN) SYSTEM UPON SERVER RECONFIGURATION

摘要

In one embodiment, a method for load balancing in a software-define networking (SDN) system includes, upon receiving a packet, determining whether a matching entry for the packet in a server distribution table contains both a current and new server selection. If the matching entry contains both, it is determined whether there is a matching entry for the packet in a transient flow table, where the transient flow table maintains server selections when at least one of the plurality of servers is reconfigured. Upon determining that there is no matching entry for the packet in the transient flow table, the method determines whether the packet is a first packet of a traffic flow. If the packet is the first packet of a traffic flow, the packet is forwarded according to the new server selection of the matching entry in the server distribution table, and the transient flow table is updated.

主权项

1. A method implemented in a network device coupled to a software-defined networking (SDN) system, wherein the SDN system contains a set of network devices forwarding traffic flows and a SDN controller managing the set of network devices, the method comprising:
upon receiving a packet for load balancing among a plurality of servers, determining whether a matching entry for the packet in a server distribution table contains both a current and a new server selection; upon determining that the matching entry in the server distribution table contains both the current and new server selection, determining whether there is a matching entry for the packet in a transient flow table, wherein the transient flow table maintains server selections when at least one of the plurality of servers is reconfigured so that at least one of the traffic flows is to be load balanced from one server to another server; and upon determining that there is a matching entry for the packet in the transient flow table, forwarding the packet according to the matching entry in the transient flow table.