Mutual table for enhancing software and hardware switched...

Details Mutual table for enhancing software and hardware switched... Mutual table for enhancing software and hardware switched...

2007-07-31

2007-07-31

Perez-Gutierrez, Rafael (Department: 2112)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C709S240000

Reexamination Certificate

active

10314003

ABSTRACT:
The invention relates to a router or switch in a broadband network operating through packet flow forwarding. The router provides a CPU switched software flow (12) and a hardware switched accelerated flow (10) in accordance with Hierarchical Flow Forwarding (HEF) by utilizing a mutual flow table (20) partitioned into at least a hardware part (22), an intermediate part (24) and a software part (26) for flow forwarding. The table is examined on a regular basis determined by a time period, and sorted by the ratio of number of packets per time period. It is filled up with the highest ratios in the hardware part (22, 22a), the intermediate ratios in the intermediate part (24, 22a,26a) and the lowest ratios in the software part (26). Those packet flows that qualified for the intermediate flow (22a,26a) in a previous examining remain in their memory space if they still qualify for the intermediate part (24). This prevents the exchange between memory spaces (22a,26a) within the intermediate part of the table relieving the CPU from this workload.

REFERENCES:
patent: 5566170 (1996-10-01), Bakke et al.
patent: 6810427 (2004-10-01), Cain et al.
patent: 2003/0198189 (2003-10-01), Roberts et al.
H. Jonathan Chao, “Next Generation Routers”, Sep. 2002, Proceeding of the IEEE, vol. 90, Issue 9, pp. 1518-1558.

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