Multiplex communications – Network configuration determination – Using a particular learning algorithm or technique
Reexamination Certificate
2004-09-30
2009-02-24
Ngo, Ricky (Department: 2416)
Multiplex communications
Network configuration determination
Using a particular learning algorithm or technique
C370S252000, C370S408000, C709S252000
Reexamination Certificate
active
07496055
ABSTRACT:
A layer 2 loop detection apparatus includes a unit recognizing a topology of an L2 network at normal time by collecting MIB information including information concerning ports of a plurality of L2 switches from the plurality of L2 switches through SNMP communication; a unit discriminating, based on a topology recognition processing, a blocking port for traffic blocking and a disable port under a port disable state each set under a Spanning Tree Protocol (STP); a unit setting each of the blocking port and the disable port as a monitoring point and periodically monitoring a state thereof; and a unit performing detection of an L2 loop by re-collecting a part of the MIB information from the plurality of L2 switches through SNMP communication and re-recognizing the topology of the L2 network, the detection of the L2 loop detection being triggered by a change of a state of one of the blocking port and the disable port.
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Seigo Yoshino, Ethernet Switch Technology -Realization of Redundancy and Loop-free. Dec. 19, 2002 NTT Data Corporation pp. 1-41.
Mutoh Ryouichi
Nishi Tetsuya
Sugitani Kiichi
Fujitsu Limited
Katten Muchin & Rosenman LLP
Ngo Ricky
Sinkantarakorn Pao
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