Methods, apparatus and data structures for preserving address and service level information in a virtual private network
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United States of America Patent
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Aug 14, 2012
Grant Date -
Jul 2, 2009
app pub date -
Feb 20, 2009
filing date -
Aug 31, 2000
priority date (Note) -
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Abstract
Supporting virtual private networks by using a new layer 3 address to encapsulate a network-bound packet so that its context information, from which a layer 2 (e.g., MAC) address can be derived, is preserved. If this encapsulation was not done, the layer 2 address would change over each segment of the network. Thus, the encapsulation preserves the concept of group identification, using at least a part of the context, over the entire network and not just at the edge of the network. If a packet is received from the network (to be forwarded to a customer), the layer 3 address that was added in the encapsulation is stripped off. The original layer 3 destination address may be used with a client device addressing table to determine a new context information, and a layer 2 (e.g., MAC) address of a destination client device.
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