# US 7,466,711 B2 · Synchronous system and method for processing a packet

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- Number: US 7,466,711 B2
- Document ID: US7466711B2
- Status: Granted
- Kind: B2
- Application number: 10/742,064
- Filed: 2003-12-20
- Published: 2004-12-23
- Granted: 2008-12-16
- Earliest claimed: 2003-06-20
- Assignees: Accton Technology Corporation
- Inventors: Shiuh-Pyng Shieh; Yung-Zen Lai; Fu-Yuan Lee
- Web page: https://patentgrep.com/patent/US7466711B2

## CPC

- H04L 45/586: of virtual routers
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A system and method for synchronously processing a packet are disclosed, which improve the speed of processing the packet by using a load balancing mechanism. The system comprises a switch and a clustered architecture for processing the packet. The switch is for receiving and transmitting the packet. The clustered architecture contains packet processing devices and receives the packet from the switch. All packet processing devices can synchronously process the packet. Each packet processing device has a non-duplicate device number.

## Claims

### Claim 1

A packet processing method, comprising:
providing a plurality of packet processing devices and at least a switch;
having said plurality of packet processing devices to synchronously receive a packet having a sequence number and a security parameter index from said switch;
having said plurality of packet processing devices to synchronously record said sequence number on a table;
locating a security association according to said security parameter index;
selecting one of said plurality of packet processing devices according to a load balancing mechanism to continue to process said packet though said security association; and
delivering said packet to a destination wherein said load balancing mechanism comprises:
assigning a packet processing priority order to said plurality of packet processing devices; processing a plurality of said packets by using said plurality of packet processing devices in said packet processing priority order, and storing in each of said plurality of packet processing devices a data amount of each of said plurality of said packets; and assigning a new packet processing priority order to said plurality of packet processing devices according to a cumulative data amount stored in each of said plurality of packet processing devices, such that the lower the cumulative data amount, the higher a new priority position in said new packet processing priority order is given to a particular one of said plurality of packet processing devices with the cumulative data amount, and repeating said processing step by using said plurality of packet processing devices in said new packet processing priority order.

### Claim 2 (depends on 1)

The method of claim 1, wherein said load balancing mechanism comprises:
assigning a packet processing priority order to said plurality of packet processing devices;
processing said packet by one, with the highest priority position in said packet processing priority order, of said plurality of packet processing devices; and
circulating said packet processing priority order of said plurality of packet processing devices and repeating said processing step for following packets.