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2 × (forward delay – 1 second) >= max age,
Max age >= 2 × (hello time + 1 second).
You are recommended to specify the network diameter of the switched network and the hello time
parameter by using the stp root primary or stp root secondary command. After that, the three proper
time-related parameters are automatically determined by MSTP.
Related commands: stp timer forward-delay, stp timer hello, stp bridge-diameter.
Examples
# Set the max age to 1,000 centiseconds.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp timer max-age 1000
stp timer-factor
Syntax
stp timer-factor number
undo stp timer-factor
View
System view
Parameters
number: Hello time factor to be set, in the range of 1 to 10.
Description
Use the stp timer-factor command to set the timeout time of a switch in the form of a multiple of the
hello time.
Use the undo stp timer-factor command to restore the hello time factor to the default value.
By default, the hello time factor of the switch is 3.
A switch regularly sends protocol packets to its neighboring devices at the interval specified by the hello
time parameter to test the links. Generally, a switch regards its upstream switch faulty if the former does
receive any protocol packets from the latter in a period three times of the hello time and then initiates the
spanning tree recalculation process.
Spanning trees may be recalculated even in a steady network if an upstream switch is always busy. You
can configure the hello time factor to a larger number to avoid this problem. Normally, the timeout time
can be four (or more) times of the hello time. For a steady network, the timeout time can be five to seven
times of the hello time.
Examples
# Set the hello time factor to 7.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp timer-factor 7
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