Distributed packet data with centralized snooping and header pro

Details Distributed packet data with centralized snooping and header pro Distributed packet data with centralized snooping and header pro

1997-12-17

2000-12-12

Nguyen, Chau

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370402, H04L 1254

Patent

active

061608092

ABSTRACT:
A packet processing system or router is disclosed that has at least one central packet-header processor, a packet broadcast bus, and local packet controllers that communicate with each other and the central packet-header processor via the packet broadcast bus. Packets received by media access controllers are passed to the associated local packet controllers and then broadcast on the packet broadcast bus. These broadcast packets are stored in packet buffer memories of the controllers, and the processor snoops for at least headers of the broadcast packets. The headers are analyzed and the processor issues forwarding instructions concerning the broadcast packets to the local packet controllers. As a result, the packet data only traverses the bus once. Only a relatively short forwarding decision is generated after the packets are broadcast and this can occur on a separate control bus, if desired. Thus, by employing centralized snooping for packet header processing coupled with distributed packet data at local controller, bus bandwidth is reduced by one-half over previous centralized configurations in which every packet traversed the bus at least twice.

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