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4 - 66 ONline Ethernet Bridge Module Installation and Operation Guide
As a reminder, this parameter at the local Bridge Module has no effect on
the operation of the network until the local bridge becomes the Root
Bridge. While the local bridge is a non-root bridge, it will function using the
Root Bridge's value for this parameter.
Note: If you choose to modify the spantree parameter default
values for forward_delay_time, hello_time, or listen_time,
you must use the following two formulas to calculate new
values:
1. 2 * (forward_delay_time - 1.0 seconds) >
listen_time
2. listen_time >
2 * (hello_time + 1.0 seconds)
The following two examples use the formulas with parameter default
values to calculate new values.
1. 2 * (15 seconds - 1.0 seconds) = 28 seconds >
20 seconds. Since
28 seconds is greater than the listen_time default value of 20
seconds, this setting is valid.
2. 20 seconds >
2 * (2 seconds + 1.0 second) = 6 seconds
Since 20 seconds is greater than 6 seconds, this setting is valid.