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

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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI COMPUTER ENGINEERING CO., LTD.TOKYO59
HITACHI, LTD.TOKYO32320

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fukuda, Masashi Hadano, JP 22 102
Matsuo, Hideyuki Taga-gun, JP 6 95
Morimoto, Shigeki Atsugi, JP 24 465
Murakami, Toshihiko Fujisawa, JP 54 281
Sakoda, Hirpyuki Hadano, JP 1 73
Yoneno, Takunori Hadano, JP 2 84

Cited Art

Patent Info (Count) # Cites Year
 
ENTERASYS NETWORKS, INC. (3)
5,018,137 Transparent load sharing for parallel networks 93 1990
5,500,860 Router using multiple hop redirect messages to enable bridge like data forwarding 132 1991
5,195,181 Message processing system having separate message receiving and transmitting processors with message processing being distributed between the separate processors 68 1992
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,280,480 Source routing transparent bridge 189 1991
5,448,565 Multiport LAN bridge 85 1992
 
ERICSSON AB (1)
5,515,376 Communication apparatus and methods 229 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 393 1992
 
TELCORDIA TECHNOLOGIES, INC. (1)
4,706,080 Interconnection of broadcast networks 125 1985

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
CISCO TECHNOLOGY, INC. (23)
6,188,694 Shared spanning tree protocol 140 1997
6,628,624 Value-added features for the spanning tree protocol 81 1998
6,535,491 Method and apparatus for rapidly reconfiguring computer networks using a spanning tree algorithm 63 1999
6,388,995 Method and apparatus for rapidly reconfiguring computers networks executing the spanning tree algorithm 65 1999
6,678,241 Fast convergence with topology switching 68 1999
6,898,189 Restartable spanning tree for high availability network systems 35 2000
6,219,739 Spanning tree with fast link-failure convergence 62 2000
6,937,576 Multiple instance spanning tree protocol 50 2000
7,061,858 High availability architecture for network devices 44 2000
6,813,250 Shared spanning tree protocol 38 2000
7,013,347 Distance vector extension to the address resolution protocol 2 2001
7,177,946 Optimal sync for rapid spanning tree protocol 21 2001
6,976,088 Method and apparatus for rapidly reconfiguring bridged networks using a spanning tree algorithm 15 2002
7,342,877 Method and system for providing a loop-free ring topology 6 2003
7,602,706 Inter-ring protection for shared packet rings 2 2003
7,606,177 Value-added features for the spanning tree protocol 2 2003
7,428,237 Fast convergence with topology switching 12 2004
7,848,264 Method and apparatus for rapidly reconfiguring computer networks 4 2005
7,599,284 Restartable spanning tree for high availability network systems 6 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 0 2006
7,558,878 Optimal sync for rapid spanning tree protocol 1 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) 2 2007
 
SONY ELECTRONICS INC. (14)
5,940,597 Method and apparatus for periodically updating entries in a content addressable memory 37 1997
5,884,040 Per-packet jamming in a multi-port bridge for a local area network 60 1997
6,012,099 Method and integrated circuit for high-bandwidth network server interfacing to a local area network 18 1997
6,446,173 Memory controller in a multi-port bridge for a local area network 16 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 47 1998
6,816,490 Statistical learning technique in a multi-port bridge for a local area network 5 1999
6,751,225 Port within a multi-port bridge including a buffer for storing routing information for data packets received in the port 8 1999
6,744,728 Data pipeline timing optimization technique in a multi-port bridge for a local area network 3 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 5 1999
6,617,879 Transparently partitioned communication bus for multi-port bridge for a local area network 41 1999
6,363,067 Staged partitioned communication bus for a multi-port bridge for a local area network 12 1999
 
SUN MICROSYSTEMS, INC. (14)
6,246,680 Highly integrated multi-layer switch element architecture 67 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 142 1997
6,094,435 System and method for a quality of service in a multi-layer network element 163 1997
6,088,356 System and method for a multi-layer network element 154 1997
6,081,512 Spanning tree support in a high performance network device 135 1997
6,081,522 System and method for a multi-layer network element 101 1997
6,052,738 Method and apparatus in a packet routing switch for controlling access at different data rates to a shared memory 31 1997
6,049,528 Trunking ethernet-compatible networks 157 1997
6,044,087 Interface for a highly integrated ethernet network element 24 1997
6,044,418 Method and apparatus for dynamically resizing queues utilizing programmable partition pointers 33 1997
6,016,310 Trunking support in a high performance network device 101 1997
5,938,736 Search engine architecture for a high performance multi-layer switch element 189 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 6 2003
 
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 116 1996
6,195,351 Logical switch set 40 1998
6,330,229 Spanning tree with rapid forwarding database updates 72 1998
6,611,502 Spanning tree with rapid propagation of topology changes 24 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 42 2003
6,934,263 Spanning tree with protocol for bypassing port state transition timers 8 2004
 
FOUNDRY NETWORKS, LLC (6)
7,564,858 System and method for enabling a remote instance of a loop avoidance protocol 4 2003
7,558,205 System and method for detecting and isolating a remote loop 5 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 0 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
 
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 2 2003
 
CONEXANT SYSTEMS UK LIMITED (1)
6,111,858 Proxy-controlled ATM subnetwork 139 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 23 1999
 
OLLCOM A/S (1)
6,940,825 Spanning tree recovery in machine networks 3 2003
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
8,446,819 System and method for detecting and isolating a remote loop 0 2011