Command Manual (For Soliton) – MSTP
H3C S3100 Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
1-56
period to synchronize with the state transition of the remote switches. This state
transition period is determined by the forward delay configured on the root bridge.
The forward delay setting configured on a root bridge applies to all non-root bridges.
As for the configuration of the three time-related parameters (namely, the hello time,
forward delay, and max age parameters), the following formulas must be met to prevent
frequent network jitter.
2 x (forward delay – 1 second) >= max age
Max age >= 2 x (hello time + 1 second)
You are recommended to specify the network diameter of the switched network and the
hello time by using the
stp root primary
or
stp root secondary
command. After that,
the three proper time-related parameters are automatically calculated by MSTP.
Related commands:
stp timer hello
,
stp timer max-age
,
stp bridge-diameter
.
Examples
# Set the forward delay to 2,000 centiseconds.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp timer forward-delay 2000
1.1.51 stp timer hello
Syntax
stp timer hello
centi-seconds
undo stp
timer hello
View
System view
Parameters
centi-seconds
: Hello time to be set, in the range of 100 to 1,000 (in centiseconds).
Description
Use the
stp timer hello
command to set the hello time of the switch.
Use the
undo stp timer hello
command to restore the hello time of the switch to the
default value.
By default, the hello time of the switch is 200 centiseconds.
A root bridge regularly sends out configuration BPDUs to maintain the stability of
existing spanning trees. If the switch does not receive BPDU packets in a specified
period, spanning trees will be recalculated because BPDU packets time out. When a
