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(a) Operation for each node in a backup ring
1. A ring fault is detected due to no reception of HC(S)s.
The master node receives neither HC(M)s sent by itself from both directions nor
HC(S)s sent by shared nodes, and detects a ring fault. For details about master node
and transit node operation during ring fault detection, because operation is the same
as multi-ring operation, see (1) Operation when a fault is detected in 20.4.3
Operation for faults and restoration other than for shared links in a shared link
non-monitoring ring.
(b) Operation for each node in a shared link monitoring ring
2. Flush control frames are sent from shared nodes.
When shared nodes receive a flush control frame from the master node of the
backup ring, they send to the shared link monitoring ring only flush control frames
that clear the MAC address table.
3. The MAC address table is cleared.
Transit nodes receive flush control frames sent from shared nodes, and clear the
MAC address table.
20.5.5 Operation during multi-fault recovery
The following explains the operation for recovery from a multi-fault on a shared link
monitoring ring.
(1) Operation during partial recovery from a multi-fault
The following figure shows operation during partial recovery from a multi-fault in a shared
link monitoring ring.
Figure 20-25 Operation during partial recovery from a multi-fault
(a) Operation for each node in a shared link monitoring ring
1. Multi-fault recovery is detected.
A shared node receives a multi-fault monitoring frame sent from an opposing shared
node, and detects multi-fault recovery.
20 Description of the Ring Protocol
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