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About Bridging
Figure 2-3 Redundant bridging
Internal bridge software will automatically designate one bridge
as the “active” bridge and the other bridge as the “standby” or
blocking bridge, preventing multiple transmissions of the same
packet by both bridges.
This software implements what is called a
spanning tree algo-
rithm
and is commonly used in the configuration shown in Figure
2-3.
The two bridges talk to each other periodically, checking each
other’s status. If the active bridge goes down or the link between
it and either segment is lost, the standby bridge automatically
(after a short time period) reconfigures itself as the active bridge,
and inter-segment transmissions will continue normally.
For a complete description of all spanning tree configuration
parameters, see Chapter 3, “AsantéBridge 1012
Local Management.”