29.4 Overview of Multi-Ring Operation
The following explains multi-ring configurations, focusing on those with shared links. The multi-ring configuration without shared link is the same as that for single ring operation. For details, see "29.3 Overview of Single Ring Operation".
From this section on, HC is used to refer to a health check frame, HC(M) is used to refer to a health check frame sent by the master node, and HC(S) is used to refer to a health check frame sent by a shared node.