Bridge-like internet protocol router

Details Bridge-like internet protocol router Bridge-like internet protocol router

1990-06-29

1994-05-03

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, 34082502, H04J 302

Patent

active

053094379

ABSTRACT:
A device and related method for coupling segments of an extended local area network (LAN) in such a way that message traffic employing inter-network protocols such as TCP/IP will be handled without the difficulties usually associated with bridges, and without the complexity and expense of full IP router capability. The device operates like a bridge for non-TCP/IP traffic. For TCP/IP traffic it operates in a bridge-like manner but maintains a database associating extended LAN segment addresses with port numbers in the device, so that packets can be automatically forwarded over a spanning tree connecting the network segments. A host computer in any network segment can address others in different network segments of the extended LAN as though all were in a single LAN. The device of the invention functions to block the flow of ARP messages and to generate ARP replies that render the device of the invention transparent to hosts within the extended LAN. The device is also transparent to true IP routers, which may still be used to effect communication with points outside the extended LAN.

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IEEE Project 802 draft on Local and Metropolitan Area Networks, MAC Bridges, P802.1d/Dg, Jul. 14, 1989.

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