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B - 4 ONline Ethernet Bridge Module Installation and Operation Guide
designated bridge for the sample shown in Figure B-1 as it forwards
information from LAN 1 and LAN 2 to the Root Bridge (BRIDGE_4).
If BRIDGE_3 is told that it is not the designated bridge, it will go into
blocking state. In blocking state the bridge monitors the network but is not
involved in forwarding packets. BRIDGE_3 then would only become the
designated bridge with a change in the network, for example, if the
designated bridge fails or another bridge is added to the network that
would change the root path cost for BRIDGE_3.
Spanning Tree Example
Figure B-2 shows a Spanning Tree configuration with multiple Bridge
Modules.