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20.3 Overview of single ring operation
20.3.1 Normal ring operation
The following figure shows normal operation for a single ring.
Figure 20-7 Normal ring operation
(1) Master node operation
To prevent fault misdetection due to one-way link faults, health check frames are sent from
two ring ports. Monitoring is performed to check that health check frames in both directions
are received within the pre-determined time. Data frame transfer is performed on the
primary port. Because the secondary port is logically blocked, data frame transfer and MAC
address learning are not performed.
(2) Transit node operation
Health check frames sent by the master node are not monitored on transit nodes. When a
health check frame is received, it is transferred to the next node in the ring. Data frame
transfer is performed on both ring ports.
20.3.2 Operation when a fault is detected
The following figure shows operation when a ring fault has been detected for a single ring.
20 Description of the Ring Protocol
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