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20 Description of the Ring Protocol
Figure 20-5 Multi-ring configuration
Each node in the ring runs as a single independent ring. Therefore, ring fault detection and
recovery detection are performed independently by each ring.
(3) Multi-ring configurations with shared links
The figure below shows the positions of the Switches in a multi-ring configuration with
shared links.
In this type of multi-ring configuration, neighboring rings are connected at two or more
nodes.
Figure 20-6 Multi-ring configuration with shared links
When multiple single rings are connected by multiple nodes, links are shared by multiple
rings. These links are called shared links, and multi-ring configuration with these links is
called a multi-ring configuration with shared links. On the other hand, when, as in (2),
multiple single rings are connected by a single node, because no shared links exist, this is
called a multi-ring configuration without shared links.
20.2.2 Control VLAN
In a network using the Ring Protocol, a special VLAN for sending and receiving control
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