Optimized forwarding for provider backbone bridges with both...

Details Optimized forwarding for provider backbone bridges with both... Optimized forwarding for provider backbone bridges with both...

2011-04-19

2011-04-19

Moore, Jr., Michael J (Department: 2467)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S428000

Reexamination Certificate

active

07929554

ABSTRACT:
In one embodiment, when a frame is directed to one or more customer instance ports (CIPs) of a switch having received the frame, the frame (a “local frame”) may be forwarded on the one or more CIPs based on only a customer space (C-space) lookup operation. Also, if the frame is not directed to any CIPs of the switch, the frame (a “transient frame”) may be forwarded on at least one or more provider backbone ports (PBPs) of the switch based on only a backbone space (B-space) lookup operation. For example, a unicast frame may be forwarded based on whether the frame terminates at the switch having received the frame (to a CIP of the switch), while a multicast frame may be forwarded based on determining whether an instance service identifier (I-SID) of the frame maps to a local VLAN ID (L-VID) at the switch (to any CIPs servicing that L-VID).

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