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20 Description of the Ring Protocol
Figure 20-17 Operation during ring faults other than for shared links in a shared link
(a) Master node operation for shared link monitoring rings
When a fault occurs in a shared link monitoring ring, the master node can no longer receive
HC(M)s from both directions, and detects a ring fault. As with a single ring, the following
fault operations are performed for the master node detecting the fault:
1. The VLAN status of the ring for data transfer is changed.
2. Flush control frames are sent.
3. The MAC address table is cleared.
4. The monitoring status is changed.
(b) Transit node operation for shared link monitoring rings
As with single rings, the following operations are performed when a flush control frame sent
from the master node is received:
5. Flush control frames are transferred.
6. The MAC address table is cleared.
(c) Master node and transit node (shared node) operation for shared link non-monitoring
rings
Because no faults occur within a shared link non-monitoring ring, fault operation is not
performed.
(2) Operation when recovery is detected
The following figure shows operation for recovery from a fault other than for shared links in
a shared link monitoring ring.
370
monitoring ring
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