29.6.3 Overview of Multiple Failure Monitoring Operations
Multi-faults are monitored on shared nodes placed at both ends of a shared link in a multi-ring configuration with shared links. A shared node sends a control frame (called a multiple failure monitoring frame) to monitor multiple failures of a shared link monitoring ring. Multi-fault monitoring frame reception is monitored on opposing shared nodes. Multiple failure monitoring frames are sent on a dedicated VLAN (called a multiple failure monitoring VLAN).
The following figure gives an overview of multi-fault monitoring operation.
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![[Figure Data]](./GRAPHICS/ZU117460.GIF)
- <Structure of this section>
(1) Operation of each node of the shared link monitoring ring
Since the operation of the master node and transit node of the shared link monitoring ring is the same as that of the multi-ring operation, refer to section 29.4.1, Operation when Ring is Normal (2), Shared Link Monitoring Ring.
For shared nodes, multi-faults for shared link monitoring rings are monitored. Shared nodes send multi-fault monitoring frames from both ring ports, and monitor whether multi-fault monitoring frames sent from both ring ports by opposing shared nodes are received within the pre-determined time.
(2) Behavior of each node in the backup ring
Since the operation of the master node and transit node of the backup ring is the same as that of the multi-ring operation, refer to section 29.4.1, Operation when Ring is Normal (1), Shared Link Non-Monitoring Ring.