Setting The Timeout Factor Of The Bridge; Configure The Time Parameters Of A Switch - Huawei Quidway S6500 Series Operation Manual

Operation Manual - STP
Quidway S6500 Series Ethernet Switches

1.2.7 Setting the Timeout Factor of the Bridge

A bridge transmits hello packet regularly to the adjacent bridges to check if there is link
failure. Generally, if the switch doesn't receive the STP packets from the upstream
switch for 3 times of hello time, the switch will decide the upstream switch is dead and
will recalculate the topology of the network. Then in steady network, the recalculation
may be caused when the upstream is busy. In this case, user can redefine the timeout
interval to a longer time by define the multiple of hello time.
You can use the following command to set the multiple value of hello time of a specified
bridge.
Perform the following configurations in system view.
Table 1-9 Setting the Timeout factor of the bridge
Set the multiple value of hello time of a specified
bridge
Restore the default multiple value of hello time
It is recommended to set 5,6 or 7 as the value of multiple in the steady network.
By default, the multiple value of hello time of the bridge is 3.

1.2.8 Configure the Time Parameters of a Switch

The switch has three time parameters, Forward Delay, Hello Time, and Max Age.
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.
Operation
Huawei Technologies Proprietary
1-16
Chapter 1 MSTP Region-configuration
Command
stp timer-factor number
undo stp timer-factor