Method and apparatus for virtual overlay networks

Details Method and apparatus for virtual overlay networks Method and apparatus for virtual overlay networks

2006-08-22

2006-08-22

Lee, Andrew C. (Department: 2616)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S400000, C370S401000

Reexamination Certificate

active

07095740

ABSTRACT:
A method and apparatus for directing messages through a network wherein multiple tables for directing messages through the network are maintained and provided. Each table corresponds to a virtual private network and contains routing information specific to that virtual private network. A separate routing table is maintained for each VPN. In one embodiment the messages are forwarded using plain IP forwarding using a route table associated with the VPN. In another embodiment separate forwarding tables using labels are generated for each virtual private network. The messages are forwarded by looking up the label in the table corresponding to the VPN In a third embodiment, a single forwarding table is utilized where the table is built based on separate routing tables for each virtual private network.

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