Command Manual - STP
Quidway S6500 Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-34
Example
# Set the Forward Delay of the device to 2000 centiseconds.
[Quidway] stp timer forward-delay 2000
1.1.37 stp timer hello
Syntax
stp timer hello
centi-senconds
undo stp timer hello
View
System view
Parameter
centi-senconds
: Specifies Hello Time value with an integer in the range of 100 to 1000
in units of centiseconds. By default, the Hello Time of the switch is 200 centiseconds.
Description
Using
stp timer hello
command, you can configure Hello Time of the switch. Using
undo stp timer hello
command, you can restore the default Hello Time.
The STP defines to transmit configuration BPDU regularly at an interval specified with
Hello Time to keep the spanning tree stable. If the switch receives no BPDU packets
for a period of time, it will recalculate the spanning tree upon the BPDU timeouts. The
root bridge transmits BPDU packets at an interval as you configured, while other
switches apply the Hello Time configured on the root bridge.
When configuring Hello time, Forward Delay and Max Age, remember to guarantee the
following equations:
2 * (Forward Delay -1.0 seconds) >= Max Age
Max Age >= 2 * (Hello Time + 1.0 seconds)
Only if the above-mentioned formulas are equal can the MSTP normally operate on the
entire network, otherwise, the network may flap frequently. You are recommended to
use the
stp instance root primary
command to specify the diameter of the switching
network, so that MSTP can automatically calculate and give the moderate values for
the time parameters.
For the related command, see
stp timer forward-delay, stp timer max-age, stp
bridge-diameter
.
Example
# Set Hello Time of the switch 300 centiseconds.
