Methods, apparatus and data structures for preserving...

Details Methods, apparatus and data structures for preserving... Methods, apparatus and data structures for preserving...

2006-01-31

2006-01-31

Nguyen, Chau (Department: 2661)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S469000

Reexamination Certificate

active

06993026

ABSTRACT:
Supporting virtual private networks by using a new layer3address to encapsulate a network-bound packet so that its context information, from which a layer2(e.g., MAC) address can be derived, is preserved. If this encapsulation was not done, the layer2address 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 layer3address that was added in the encapsulation is stripped off. The original layer3destination address may be used with a client device addressing table to determine a new context information, and a layer2(e.g., MAC) address of a destination client device. If the client device addressing table does not include entries corresponding to the layer3destination address, an address resolution protocol (or “ARP”) may be broadcast to request such information or contents of inbound packets may be observed (snooping). The packet may then be forwarded to an aggregation device.

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