Stp Timer Max-Age - H3C S5120-SI Series Command Reference Manual

View
System view
Default Level
2: System level
Parameters
time: Hello time in centiseconds, ranging from 100 to 1000 at the step of 100.
Description
Use the stp timer hello command to set the hello time of the device.
Use the undo stp timer hello command to restore the system default.
By default, the hello time is set to 200 centiseconds.
Hello time is the time interval at which MSTP-enabled devices send configuration BPDUs to maintain
spanning tree. If a device fails to receive configuration BPDUs within the set period of time, a new
spanning tree calculation process will be triggered due to timeout. The root bridge sends configuration
BPDUs at the interval of the hello time set through this command, while non-root bridges use the hello
time set on the root bridge.
The settings of the hello time, forward delay and max age timers must meet the following formulae, thus
avoiding frequent network changes:
2 × (forward delay – 1 second) ƒ max age
Max age ƒ 2 × (hello time + 1 second)
We recommend that you specify the network diameter of the switched network using the stp root
primary command and let MSTP automatically calculate optimal settings of these three timers.
Related commands: stp timer forward-delay, stp timer max-age, stp bridge-diameter.
Examples
# Set the hello time of the device to 400 centiseconds.
<Sysname> system-view
[Sysname] stp timer hello 400

stp timer max-age

Syntax
stp timer max-age time
undo stp timer max-age
View
System view
Default Level
2: System level
Parameters
time: Max age in centiseconds, ranging from 600 to 4000 at the step of 100.
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