METHOD, SYSTEM AND WIRELESS ROUTER APPARATUS SUPPORTING MULTIPLE SUBNETS FOR LAYER 3 ROAMING IN WIRELESS LOCAL AREA NETWORKS (WLANs)

摘要

A wireless router is provided which is configured to support a first subnet and a second subnet. The wireless router comprises a plurality of virtual wireless switches. Each virtual wireless switch comprises a plurality of access ports. The first subnet comprises a group of the access ports belonging to the first virtual wireless switch, and the second subnet comprises a second group of the access ports belonging to the second virtual wireless switch. The wireless router is configured to support layer 3 mobility when a client, having a client IP address from within the first subnet, roams from the first subnet to the second subnet, from the first to the second virtual wireless switch. The wireless router stores registration information associated with the client to allow a client to roam between the first subnet and the second subnet while keeping the client IP address. The wireless router uses the registration information to send packets to the client when the client has roamed to the second subnet.