| 摘要 |
A plurality of bridges are interconnected between respective ports thereof in a ring shape to configure a network containing a redundant route. When a bridge has a blocking port, the bridge transmits to the network a blocking advertisement containing information indicating that it has a blocking port and its address. When a bridge does not have a blocking port, the bridge transmits a line failure notification to other bridges having a blocking port when a line failure is sensed. When a bridge has a blocking port and the line failure notification has been received from other bridges, the bridge transmits to the network a blocking release advertisement indicating that the blocking port has been transited to a forwarding state and the blocking state has been released. When a bridge receives a blocking release advertisement packet, the bridge erases a forwarding database thereof.
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