Fujitsu Network Communications, Inc.

Bruce Pietsch

Jae Park

Roy McNeil

Jon Allingham

LAN interface logic ( ) receives frames from a LAN segment ( ), and frame transport logic ( ) transfers frames to and from an ATM network. Forwarding logic ( ) is used to (i) determine whether a mapping between a destination address (DA) and a virtual connection (VC) in the ATM network exists, (ii) forward frames containing a known DA to the frame transport logic for transfer to the ATM network, (iii) forward frames containing unknown DAs to the frame transport logic for transfer to a broadcast and unknown server (BUS ) in the ATM network, and (iv) pass unknown DAs to a LAN emulation client (LEC) processor ( , FIG. ) to resolve the address. The LEC processor creates a LAN emulation address resolution protocol (LE_ARP) request message containing the unknown DA, and the LE_ARP request message is transferred to a LAN emulation server (LES ). The LES returns an ATM address of a remote LEC via which the destination node can be reached. The LEC processor uses the ATM address to establish a new VC to the destination node, and provides the DA-VC mapping to the forwarding logic for use in forwarding subsequently received frames.

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Orangeburg, NY, United States of America

Bruce Pietsch