Huawei Quidway S9300 Configuration Manual page 218

8 MSTP Configuration
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp bridge-diameter diameter
The network diameter is set.
Step 3 Run:
stp timer forward-delay forward-delay
The forward delay of the S9300 is set.
It is recommended that you run the stp bridge-diameter command to set the network diameter
instead of setting the forward delay directly. The S9300 calculates the optimal forward delay
according to the network diameter.
By default, the forward delay is 1500 centiseconds, that is, 15 seconds.
To prevent frequent network flapping, make sure that the Hello time, forward delay, and max
age conform to the following formulas:
l
l
Step 4 Run:
stp timer hello hello-time
The Hello time of the S9300 is set.
It is recommended that you run the stp bridge-diameter command to set the network diameter
instead of setting the Hello time directly. The S9300 calculates the optimal Hello time according
to the network diameter.
By default, the Hello time is 200 centiseconds, that is, 2 seconds.
Step 5 Run:
stp timer-factor timer-factor
The timer factor that is used to calculate the timeout interval of the S9300 according to the Hello
time is set.
The timeout interval is calculated through the following formula: Timeout interval = 3 x Hello
time x Timer factor. If the S9300 does not receive the BPDU from the upstream S9300 within
the timeout interval, the S9300 considers that the upstream S9300 has failed and recalculates
the spanning tree.
Sometimes, the S9300 does not receive the BPDU from the upstream S9300 because the
upstream S9300 is busy. In this case, the spanning tree should not be recalculated. Therefore, to
save network resources, you should set a longer timeout interval on a stable network.
On a stable network, the recommended timer factor range is 5 to 7.
By default, the timer factor is 3.
Step 6 Run:
8-16
2 x (Forward delay - 1.0 second) >= Max age
Max age >= 2 x (Hello time + 1.0 second)
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Quidway S9300 Terabit Routing Switch
Configuration Guide - Ethernet
Issue 03 (2009-08-20)