| 摘要 |
A plurality of bridges containing an own bridge and other bridges are connected to each other between respective ports thereof in a ring shape to configure a network containing a redundant route. When the own bridge has a blocking port, the bridge transmits a blocking advertisement containing its own address indicating that the port of the bridge has been transited to a blocking state, to the network by a broadcast packet. In the case where the own bridge does not have the blocking port, the bridge transmits a line failure notification to the other bridges having a blocking port when a line failure is sensed. When the own bridge has a blocking port and the line failure notification has been received from the other bridges, the bridge transmits a blocking release advertisement which indicates that the blocking port has been transited to a forwarding state and the blocking state has been released, to the network by a broadcast packet. When the own bridge has been received a blocking release advertisement packet, the bridge erases a forwarding database thereof.
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