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20 Description of the Ring Protocol
Figure 20-15 Operation during a ring fault other than for shared links on shared link
(a) Master node operation for shared link non-monitoring rings
The master node of a shared link non-monitoring ring detects a ring fault when it receives
neither the two-way HC(M) sent by itself nor the HC(S) sent by a shared node. As with a
single ring, the following 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 and shared node operation for shared link non-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 monitoring rings
Because no faults occur within a shared link monitoring ring, fault operation is not
performed.
(2) Operation when recovery is detected
The following figure shows operation when a fault is restored other than for shared links in
a shared link non-monitoring ring.
368
non-monitoring rings
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