| 摘要 |
A redundancy method in a network including an upper switch apparatus, middle switch apparatuses connected to the upper switch apparatuses via transmission lines and lower switch apparatuses each being connected to the middle switch apparatuses via transmission lines is provided. In the redundancy method, the upper switch apparatus has link aggregation setting for the transmission lines connected to the middle switch apparatuses, and each lower switch apparatus has link aggregation setting for the transmission lines connected to the middle switch apparatuses, and the upper switch apparatus and one of the lower switch apparatuses switches a traffic route from a transmission line that is failed and that is connected to one of the middle switches to another transmission line for which link aggregation is set with respect to the failed transmission line.
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