Table of Contents
Advertisement
Figure 20-16 Operation for recovery from a ring fault other than for shared links in a shared
(a) Master node operation for shared link non-monitoring rings
When a ring fault has been detected, and either the master node receives an HC(M) that it
sent itself, or an HC(S) sent by shared nodes are received from both directions, recovery
from the ring fault is determined. As with a single ring, the following restoration operations
are performed:
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, restoration is not performed.
20.4.4 Faults and restoration other than for shared links in a shared link
monitoring ring
The following explains faults and restoration other than for shared links in a shared link
monitoring ring.
(1) Operation when a fault is detected
The following figure shows operation when a fault is detected other than for shared links in
a shared link monitoring ring.
link non-monitoring ring
20 Description of the Ring Protocol
369
Advertisement
Table of Contents
