US Patent No: 5,761,435

Number of patents in Portfolio can not be more than 2000

Multiprocessor bridge having storage for spanning tree operation mode information indicating whether each port of the bridge is operable under spanning tree protocol

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Abstract

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A multiprocessor bridge construction allows ports that are operable under a spanning tree protocol to coexist with ports that are inoperable under the spanning tree protocol, thus making it possible to improve the frame-repeating capability of the bridge, to equip the bridge with a large number of ports, and to divide the spanning tree topology into a plurality of portions to be managed.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI COMPUTER ENGINEERING CO., LTD.TOKYO59
HITACHI, LTD.TOKYO31556

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fukuda, Masashi Hadano, JP 29 111
Matsuo, Hideyuki Taga-gun, JP 7 104
Morimoto, Shigeki Atsugi, JP 27 526
Murakami, Toshihiko Fujisawa, JP 67 346
Sakoda, Hirpyuki Hadano, JP 1 79
Yoneno, Takunori Hadano, JP 2 90

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ENTERASYS NETWORKS, INC. (3)
5,018,137 Transparent load sharing for parallel networks 97 1990
5,500,860 Router using multiple hop redirect messages to enable bridge like data forwarding 138 1991
5,195,181 Message processing system having separate message receiving and transmitting processors with message processing being distributed between the separate processors 84 1992
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,280,480 Source routing transparent bridge 199 1991
5,448,565 Multiport LAN bridge 91 1992
 
ERICSSON AB (1)
5,515,376 Communication apparatus and methods 239 1993
 
ROCKSTAR BIDCO, LP (1)
5,490,252 System having central processor for transmitting generic packets to another processor to be altered and transmitting altered packets back to central processor for routing 421 1992
 
TELCORDIA TECHNOLOGIES, INC. (1)
4,706,080 Interconnection of broadcast networks 136 1985

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
CISCO TECHNOLOGY, INC. (25)
6,188,694 Shared spanning tree protocol 169 1997
6,628,624 Value-added features for the spanning tree protocol 94 1998
6,535,491 Method and apparatus for rapidly reconfiguring computer networks using a spanning tree algorithm 73 1999
6,388,995 Method and apparatus for rapidly reconfiguring computers networks executing the spanning tree algorithm 86 1999
6,678,241 Fast convergence with topology switching 79 1999
6,898,189 Restartable spanning tree for high availability network systems 42 2000
6,219,739 Spanning tree with fast link-failure convergence 70 2000
6,937,576 Multiple instance spanning tree protocol 66 2000
7,061,858 High availability architecture for network devices 61 2000
6,813,250 Shared spanning tree protocol 52 2000
7,013,347 Distance vector extension to the address resolution protocol 3 2001
7,177,946 Optimal sync for rapid spanning tree protocol 25 2001
6,976,088 Method and apparatus for rapidly reconfiguring bridged networks using a spanning tree algorithm 24 2002
7,342,877 Method and system for providing a loop-free ring topology 7 2003
7,602,706 Inter-ring protection for shared packet rings 4 2003
7,606,177 Value-added features for the spanning tree protocol 5 2003
7,428,237 Fast convergence with topology switching 15 2004
7,848,264 Method and apparatus for rapidly reconfiguring computer networks 10 2005
7,599,284 Restartable spanning tree for high availability network systems 11 2005
8,165,043 Multiple instance spanning tree protocol 0 2005
7,995,499 Minimizing spanning-tree protocol event processing and flooding in distribution networks 1 2006
7,558,878 Optimal sync for rapid spanning tree protocol 3 2007
8,077,709 Redundancy at a virtual provider edge node that faces a tunneling protocol core network for virtual private local area network (LAN) service (VPLS) 5 2007
8,650,285 Prevention of looping and duplicate frame delivery in a network environment 0 2011
8,650,286 Prevention of looping and duplicate frame delivery in a network environment 0 2011
 
SONY ELECTRONICS INC. (14)
5,940,597 Method and apparatus for periodically updating entries in a content addressable memory 39 1997
5,884,040 Per-packet jamming in a multi-port bridge for a local area network 69 1997
6,012,099 Method and integrated circuit for high-bandwidth network server interfacing to a local area network 19 1997
6,446,173 Memory controller in a multi-port bridge for a local area network 21 1998
6,256,313 Triplet architecture in a multi-port bridge for a local area network 10 1998
6,301,256 Selection technique for preventing a source port from becoming a destination port in a multi-port bridge for a local area network 15 1998
6,157,951 Dual priority chains for data-communication ports in a multi-port bridge for a local area network 17 1998
6,308,218 Address look-up mechanism in a multi-port bridge for a local area network 52 1998
6,816,490 Statistical learning technique in a multi-port bridge for a local area network 10 1999
6,751,225 Port within a multi-port bridge including a buffer for storing routing information for data packets received in the port 10 1999
6,744,728 Data pipeline timing optimization technique in a multi-port bridge for a local area network 4 1999
6,738,384 Technique for optimizing cut-through for broadcast and multi-cast packets in a multi-port bridge for a local area network 7 1999
6,617,879 Transparently partitioned communication bus for multi-port bridge for a local area network 48 1999
6,363,067 Staged partitioned communication bus for a multi-port bridge for a local area network 13 1999
 
SUN MICROSYSTEMS, INC. (14)
6,246,680 Highly integrated multi-layer switch element architecture 76 1997
6,128,666 Distributed VLAN mechanism for packet field replacement in a multi-layered switched network element using a control field/signal for indicating modification of a packet with a database search engine 163 1997
6,094,435 System and method for a quality of service in a multi-layer network element 169 1997
6,088,356 System and method for a multi-layer network element 184 1997
6,081,512 Spanning tree support in a high performance network device 141 1997
6,081,522 System and method for a multi-layer network element 120 1997
6,052,738 Method and apparatus in a packet routing switch for controlling access at different data rates to a shared memory 32 1997
6,049,528 Trunking ethernet-compatible networks 192 1997
6,044,087 Interface for a highly integrated ethernet network element 25 1997
6,044,418 Method and apparatus for dynamically resizing queues utilizing programmable partition pointers 34 1997
6,016,310 Trunking support in a high performance network device 116 1997
5,938,736 Search engine architecture for a high performance multi-layer switch element 194 1997
6,061,362 Interface for a highly integrated ethernet network element 30 1999
7,339,900 Method and apparatus for preventing spanning tree loops during traffic overload conditions 8 2003
 
FOUNDRY NETWORKS, LLC (8)
7,564,858 System and method for enabling a remote instance of a loop avoidance protocol 13 2003
7,558,205 System and method for detecting and isolating a remote loop 9 2003
7,822,049 System and method for enabling a remote instance of a loop avoidance protocol 3 2005
7,944,816 System and method for detecting and isolating a remote loop 1 2009
7,856,490 System and method for multiple spanning tree protocol domains in a virtual local area network 1 2009
8,345,699 System and method for enabling a remote instance of a loop avoidance protocol 0 2010
8,817,666 System and method for multiple spanning tree protocol domains in a virtual local area network 0 2010
8,446,819 System and method for detecting and isolating a remote loop 0 2011
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (7)
5,878,232 Dynamic reconfiguration of network device's virtual LANs using the root identifiers and root ports determined by a spanning tree procedure 130 1996
6,195,351 Logical switch set 48 1998
6,330,229 Spanning tree with rapid forwarding database updates 77 1998
6,611,502 Spanning tree with rapid propagation of topology changes 28 1999
6,771,610 Spanning tree with protocol for bypassing port state transition timers 12 1999
6,697,339 High availability spanning tree with rapid reconfiguration with alternate port selection 49 2003
6,934,263 Spanning tree with protocol for bypassing port state transition timers 10 2004
 
NEC CORPORATION (4)
6,003,137 Virtual group information managing method in bridge for network connection 24 1997
7,280,488 Communication device, network system using same, and method of constructing spanning tree 3 2002
7,136,390 Communication apparatus, communication system, and communication control method 1 2002
7,532,588 Network system, spanning tree configuration method and configuration program, and spanning tree configuration node 3 2003
 
FORTINET, INC. (2)
8,565,115 Adaptive load balancing 3 2012
8,660,007 Performing rate limiting within a network 0 2013
 
CONEXANT SYSTEMS UK LIMITED (1)
6,111,858 Proxy-controlled ATM subnetwork 171 1997
 
FUJITSU LIMITED (1)
6,813,238 Cable modem and cable modem system 3 1999
 
INTEL CORPORATION (1)
6,628,661 Spanning tree recovery in computer networks 25 1999
 
OLLCOM A/S (1)
6,940,825 Spanning tree recovery in machine networks 6 2003
 
Other [Check patent profile for assignment information] (1)
8,873,424 Adaptive load balancing 0 2013