Bridged cryptographic VLAN
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United States of America Patent
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Apr 20, 2010
Grant Date -
Aug 21, 2008
app pub date -
Aug 20, 2007
filing date -
Dec 20, 2001
priority date (Note) -
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Abstract
The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
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