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20 Description of the Ring Protocol
Figure 20-13 Operation during shared link faults
(a) Master node operation for shared link monitoring rings
When a fault occurs on a shared link, the master node can no longer receive HC(M)s from
both directions, and a ring fault is detected. 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 operation for shared link non-monitoring rings
Because the master node in a shared link non-monitoring ring does not detect ring faults for
shared links, no fault operations are performed. Therefore, path switching does not occur
for transit nodes.
(2) Operation when recovery is detected
The following figure shows operation when recovery from a fault is detected for a shared
link.
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