Stp Timer Forward-Delay; Stp Timer Hello - H3C S5120-SI Series Command Reference Manual

stp timer forward-delay

Syntax
stp timer forward-delay time
undo stp timer forward-delay
View
System view
Default Level
2: System level
Parameters
time: Forward delay in centiseconds, ranging form 400 to 3000 at the step of 100.
Description
Use the stp timer forward-delay command to set the forward delay timer of the device.
Use the undo stp timer forward-delay command to restore the system default.
By default, the forward delay timer is set to 1,500 centiseconds.
In order to prevent temporary loops, a port must go through an intermediate state, the learning state,
before it transitions from the discarding state to the forwarding state, and must wait a certain period of
time before it transitions from one state to another to keep synchronized with the remote device during
state transition. The forward delay timer set on the root bridge determines the time interval of state
transition.
If the current device is the root bridge, the state transition interval of the device depends on the forward
delay value configured through this command; for a non- root bridge, its state transition interval is
determined by the forward delay timer 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 hello, stp timer max-age, stp bridge-diameter.
Examples
# Set the forward delay timer of the device to 2,000 centiseconds.
<Sysname> system-view
[Sysname] stp timer forward-delay 2000

stp timer hello

Syntax
stp timer hello time
undo stp timer hello
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