Asante IntraCore 6524, Руководство пользователя

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Advanced Management
Page 4-4
Maximum Age
Each bridge should receive regular configuration BPDUs from the direction of
the root bridge. If the maximum age timer expires before the bridge receives
another BPDU, it assumes that a change in the topology has occurred, and it
begins recalculating the spanning tree.
Forward Delay
After a recalculation of the spanning tree, the Forward Delay parameter
regulates the delay before each port begins transmitting traffic. If a port begins
forwarding traffic too soon, the network can be adversely affected. The
permitted range of the Forward Delay is 4 to 30 seconds.
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Note: The Hello Time, Maximum Age, and Forward Delay
are constrained by the following formula:
(Hello Time + 1) <= Maximum Age <= 2 x (Forward Delay -1)
In general, reducing the values of these timers will make the
spanning tree react faster when the topology changes, but
may cause temporary loops as the tree stabilizes in a new
configuration. Lengthening the timers will make the tree
react more slowly to changes in configuration but will make
an unintended reconfiguration less likely. All of the bridges
in the tree must agree on the values of these timers, so each
bridge uses the ones advertised by the root.
Port Priority
If two ports are connected to the same segment, changing the Port Priority
increases or decreases the probability that either port will be chosen for
inclusion in the tree.