User's Manual

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Note:
When no spanning-tree is set and a port has served as a root port, alternate port, master port
or backup port, the protocol information that this port receives in RSTP/MSTP mode will age
immediately and transfer to be a designated port, while the protocol information that this port
receives in SSTP/PVST mode will remain the original role for a certain period and then age after
the timer times out.
Note:
Every STP mode supports the BPDU Guard function on the port on which no spanning-tree is
set.
34.3.4 Settingthe Bridge Priority
You can choose the spanning-tree root of the network topology by changing the bridge priority of a switch.
Run the following commands to set the bridge priority of SSTP:
Command Purpose
spanning-tree sstp priority
value Modifies the bridge priority of the SSTP mode.
no spanning-tree sstp priority
Resumes the SSTP bridge priority to the
default value, 32768.
34.3.5 Setting the Hello Time
You can configure the hello time of the SSTP to decide the packet transmission's interval when the switch
works as the root.
Run the following commands to set the SSTP hello time.
Command Purpose
spanning-tree sstp hello-time
value Modifies the hello time in SSTP mode.
no spanning-tree sstp hello-time
Resumes the SSTP hello time to the default
value, 2 seconds.
34.3.6 Setting the Max Age
You can configure the SSTP max age to decide the maximum lifespan of the packet when the switch works as
the root.
Run the following commands to configure the SSTP max age.
Command Purpose
spanning-tree sstp max-age
value Modifies the Max Age of the SSTP mode.
no spanning-tree sstp max-age
Resumes the max age to the default value, 20
seconds.
34.3.7 Setting the Forward Delay
You can configure the forward delay time of the SSTP to decide the state change interval of all switches when
these switches works as the root.