| 摘要 |
<p>A communication system includes a redundancy network, which includes first and second switch apparatuses and employs a ring protocol or the like, and third switch apparatuses. The first and second switch apparatuses function logically as a signal switch apparatus (MLAG). Each third switch apparatus operates with link aggregation (LAG) being set between the third switch apparatus and the first and second switch apparatuses. When a failure occurs in communication between redundant ports of the first and second switch apparatuses, a fourth switch apparatus supporting the ring protocol performs control to put master and slave ports thereof into an open state and the second switch apparatus performs control to put user ports thereof into a blocking state.</p> |
