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FriendlyNET FM2008/2009
42 User’s Manual
occurred, and it begins recalculating the spanning tree. The default setting
for Maximum Age is
15 seconds.
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 (before a new root bridge has been
selected), the network can be adversely affected. The default value for
Forward Delay is 5 seconds.
Note
: The above parameters (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 its new configuration. Increasing the values of these
timers will make the tree react more slowly to changes in topology, but will
make an unintended reconfiguration less likely. All of the bridges on the
network will use the values set by the root bridge. It is only necessary to
reconfigure that bridge if you wish to change the parameters.