![Huawei Quidway S3000-EI Series Operation Manual Download Page 195](http://html.mh-extra.com/html/huawei/quidway-s3000-ei-series/quidway-s3000-ei-series_operation-manual_169463195.webp)
Operation Manual - STP
Quidway S3000-EI Series Ethernet Switches
Chapter 1 MSTP Region-configuration
Huawei Technologies Proprietary
1-16
Forward Delay is the switch state transition mechanism. The spanning tree will be
recalculated upon link faults and its structure will change accordingly. However, the
configuration BPDU recalculated cannot be immediately propagated throughout the
network. The temporary loops may occur if the new root port and designated port
forward data right after being elected. Therefore the protocol adopts a state transition
mechanism. It takes a Forward Delay interval for the root port and designated port to
transit from the learning state to forwarding state. The Forward Delay guarantees a
period of time during which the new configuration BPDU can be propagated throughout
the network.
The switch sends Hello packet periodically at an interval specified by Hello Time to
check if there is any link fault.
Max Age specifies when the configuration BPDU will expire. The switch will discard the
expired configuration BPDU.
You can use the following command to configure the time parameters for the switch.
Perform the following configuration in system view.
Table 1-9
Configure the time parameters of a switch
Operation
Command
Configure Forward Delay on the switch.
stp
timer forward-delay centiseconds
Restore the default Forward Delay of
the switch.
undo stp
timer forward-delay
Configure Hello Time on the switch.
stp timer hello centiseconds
Restore the default Hello Time on the
switch.
undo stp timer hello
Configure Max Age on the switch.
stp
timer max-age centiseconds
Restore the default Max Age on the
switch.
undo stp timer
max-age
Every switch on the switching network adopts the values of the time parameters
configured on the root switch of the CIST.