US Patent No: 6,032,194

Number of patents in Portfolio can not be more than 2000

Method and apparatus for rapidly reconfiguring computer networks

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Abstract

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A method that rapidly reconfigures a computer network having a plurality of devices executing the spanning tree algorithm. First, one or more devices are configured and arranged so that one port, providing connectivity to the root, is in the forwarding state and the remaining ports, providing connectivity to the root, are in the blocked state. Next, one or more of the blocked ports are designated as back-up ports. Upon detection of a failure at the active forwarding port, one of the back-up ports immediately transitions from blocked to forwarding, thereby becoming the new active port for the device. Following the transition to a new active port, dummy multicast messages are transmitted, each containing the source address of an entity directly coupled to the affected device or downstream thereof. By examining the dummy multicast messages, other devices in the network learn to use to the new forwarding port of the affected device. Rapid reconfiguration of the network is also provided upon detection of a new or repaired link or device representing a better path toward the root. The method is also compatible with networks supporting virtual local area network (VLAN) designations and allows load balancing among different VLANs.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CISCO TECHNOLOGY, INC.SAN JOSE, CA13061

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dutt, Dinesh G Santa Clara, CA 37 1233
Gai, Silvano Vigliano d'Asti, IT 79 4860
McCloghrie, Keith San Jose, CA 54 3338

Cited Art Landscape

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* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (6)
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7,480,258 Cross stack rapid transition protocol 44 2003
7,864,708 Method and apparatus for forwarding a tunneled packet in a data communications network 3 2003
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8,885,688 Control message management in physical layer repeater 0 2006
8,095,067 Frequency translating repeater with low cost high performance local oscillator architecture 7 2006
8,023,885 Non-frequency translating repeater with downlink detection for uplink and downlink synchronization 15 2006
* 2007/0032,192 Frequency translating repeater with low cost high performance local oscillator architecture 13 2006
8,089,913 Physical layer repeater with selective use of higher layer functions based on network operating conditions 7 2007
* 2010/0002,620 REPEATER HAVING DUAL RECEIVER OR TRANSMITTER ANTENNA CONFIGURATION WITH ADAPTATION FOR INCREASED ISOLATION 13 2007
8,559,379 Method and apparatus for mitigating oscillation between repeaters 5 2007
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8,774,079 Repeater techniques for multiple input multiple output utilizing beam formers 3 2007
 
ANRITSU CORPORATION (2)
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* 2001/0021,177 Spanning tree bridge and route change method using the same 3 2001
 
ERICSSON AB (1)
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ALCATEL LUCENT (6)
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* 2006/0165,002 Port re-enabling by monitoring link status 15 2004
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7,957,324 Utilizing bandwidth in ring network using path cost and protection techniques 0 2008
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ALCATEL-LUCENT USA INC. (2)
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THOMSON LICENSING (2)
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HONEYWELL INTERNATIONAL INC. (1)
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DELL PRODUCTS L.P. (1)
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RPX CLEARINGHOUSE LLC (3)
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BROCADE COMMUNICATIONS SYSTEMS, INC. (5)
7,558,195 System and method for providing network route redundancy across layer 2 devices 44 2007
8,014,301 System and method for providing network route redundancy across layer 2 devices 8 2009
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8,654,630 Techniques for link redundancy in layer 2 networks 1 2010
8,593,987 System and method for providing network route redundancy across layer 2 devices 3 2011
 
NTT DOCOMO, INC. (1)
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SAUDI ARABIAN OIL COMPANY (1)
9,348,710 Proactive failure recovery model for distributed computing using a checkpoint frequency determined by a MTBF threshold 0 2014
 
FLUKE CORPORATION (1)
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* Cited By Examiner