Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2006-12-26
2006-12-26
Lee, Andrew C. (Department: 2616)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S400000, C370S401000
Reexamination Certificate
active
07154889
ABSTRACT:
A service provider's routers (PE1, P1, P2, PE2) provide connections between and share routing information with routers (CE1, CE2) of a customer virtual private network (VPN) as well as routers of other customers' VPNs, which may have overlapping address spaces. A service provider's edge router (PE1) informed by the customer's router (CE1) that it will forward packets to a given prefix notifies the other edge router (PE2) that PE1can forward packets to that address prefix if the destination is in the VPN to which CE1belongs. PE1also tells PE2to tag any thus-destined packets with a particular tag T3. PE2stores this information in a forwarding information base that it separately keeps for that VPN so that when PE2receives from a router CE2in the same VPN a packet whose destination address has that prefix, it tags the packet as requested. But PE2also tags it with a tag T2that the router P2to which PE2first sends it has asked PE2to apply to packets to be sent to PE1. P2routes the packet in accordance with T2, sending it to P1after replacing T2with a tag T1that P1has similarly asked P2to use. P1removes T1from the packet and forwards it in accordance with T1to PE1, which in turn removes T3from the packet and forwards it in accordance with T3to CE1. In this manner, only the edge routers need to maintain separate routing information for separate VPNs.
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Rekhter Yakov
Rosen Eric C.
Cesari and McKenna LLP
Cisco Technology Inc.
Lee Andrew C.
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