05825772 is referenced by 559 patents and cites 17 patents.

Method and apparatus providing connection-oriented services for packet switched data communications networks. Directory services include distributed discovery of MAC addresses and protocol alias addresses. Topology services include a link state topology exchange among switches, which provides each switch with a complete topology graph of the network. This enables an access switch receiving a data packet to determine a complete path from a source end system to a destination end system. Another service includes resolution of broadcast frames to unicast frames, in order to reduce the amount of broadcast traffic. Policy restrictions may be applied prior to connection setup. Path determination services enable multiple paths from a source to a destination. Connection management includes source routed mapping of connections on the desired path. A distributed call rerouting service is provided wherein if a link on an active path fails, each switch receives a topology change notification and unmaps any connection involving the failed link. A broadcast/unknown service provides restricted flooding of nonresolvable packets. Furthermore, connection-oriented switching is provided based on the source and destination MAC addresses as a connection identifier. Still further, resolution of networks outside the switch domain is enabled by access switches listening for network and server route advertisements and maintaining best routes to said networks and servers. The best route metrics may be combined with best path metrics to determine a path from a first access switch to an egress switch connected to the external network.

Title
Distributed connection-oriented services for switched communications networks
Application Number
559738
Publication Number
5825772
Application Date
April 2, 1996
Publication Date
October 20, 1998
Inventor
Michael Skubisz
Durham
NH, US
David L Cullerot
Manchester
NH, US
Chris Oliver
Rochester
NH, US
Brendan Fee
Nashua
NH, US
Kevin Yohe
Amherst
NH, US
David H Bahi
Manchester
NH, US
Philip Andlauer
Londonderry
NH, US
Theodore Len
Amherst
NH, US
Laura Kane
Merrimack
NH, US
David J Ruffen
Salem
NH, US
Thomas A Grant
Derry
NH, US
Kurt Dobbins
Bedford
NH, US
Agent
Wolf Greenfield & Sacks P C
Assignee
Cabletron Systems
NH, US
IPC
H04L 12/44
H04L 12/56
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