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.
