Patent · US Expired

Apparatus and method for learning and filtering destination and source addresses in a local area network system

US5136580A · kind A · utility

210Cited by
6References
15Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 16, 1990
Grant dateAug 4, 1992
Priority date
Expiry dateMay 16, 2010

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04L45/7453
  • WIPO fieldDigital communication
  • WIPO sectorElectrical engineering

Abstract

An apparatus and method for learning and filtering destination and source addresses in a local area network (LAN) system is provided to facilitate the transfer of information packets from one local area network to another. The apparatus provides a link between two (or more) remotely located LANS through the use of a LAN bridge. The apparatus has a LAN controller interface, a microprocessor, a state machine and one or more content addressable memories which function to monitor an information packet received from the LAN. One such apparatus is connected to each of the LANs to be interfaced and each of these apparatus to each other in order to communicate messages between the LANs. Upon detection of an information packet, the apparatus examines both the source and destination addresses of the packet. The source address is compared to a dynamically generated table of source addresses and then compared to the incoming destination address. If the destination address is found in the table of source addresses, than the packet is destined for a node on the local LAN and thus will not be sent over the bridge between the two LANs. If, on the other hand, the destination address is not in the t…

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.