Methods and devices to support mobility of a client across VLANs and subnets, while preserving the client's assigned IP address
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United States of America Patent
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Aug 23, 2011
Grant Date -
Aug 5, 2010
app pub date -
Apr 12, 2010
filing date -
Oct 15, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to methods and devices that support mobility of a client across a campus, particularly mobility across VLANs and subnets, while preserving the client's assigned IP address. Both layer 2 and layer 3 packets are supported. Mobility support most clearly applies to wireless clients, but could apply to other kinds of mobile connections, even to wired connections. A smart server is adapted to support multiple VLANs and to modify and redirect packets in sessions with a client that moves from one VLAN to another, preserving the client's assigned EP address. Two or more smart servers, in cooperation with a smart manger, modify packets and tunnel them between smart servers when a client that moves from one VLAN to another and from one smart server to another, again preserving the client's assigned IF address. A similar approach applies to support mobility of a client that moves between subnets that are supervised by two smart servers, with the second smart server acting on behalf of the first smart server and tunneling packets back and forth to the first smart server. Particular aspects of the present invention are described in the claims, specification and drawings.
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