3Com Switch 4200G Configuration Guide

The mCheck Configuration 135
A lower port priority value indicates a higher port priority. If all the ports of a switch
have the same port priority value, the port priorities are determined by the port
indexes. Changing the priority of a port will cause spanning tree regeneration.
You can configure port priorities according to actual networking requirements.
Configuration example
1 Configure the port priority of GigabitEthernet1/0/1 port in spanning tree instance 1 to
be 16.
■ Configure in system view.
<S4200G> system-view
System View: return to User View with Ctrl+Z.
[4200G] stp interface GigabitEthernet1/0/1 instance 1 port priority 16
■ Configure in Ethernet port view.
<S4200G> system-view
System View: return to User View with Ctrl+Z.
[4200G] interface GigabitEthernet1/0/1
[4200G-GigabitEthernet1/0/1] stp instance 1 port priority 16
Point-to-point
Link-Related
Configuration
Refer to “Point-to-point Link-Related Configuration”.
MSTP Configuration Refer to “MSTP Configuration”.
The mCheck
Configuration
As mentioned previously, ports on an MSTP-enabled switch can operate in three
modes: STP, RSTP, and MSTP. A port on an MSTP-enabled switch automatically toggles
to the STP/RSTP mode when an STP-/RSTP-enabled switch is connected to it. But
when the STP-/RSTP-enabled switch is disconnected from the port, the port cannot
automatically toggle back to the MSTP mode and still remains in the STP/RSTP mode.
In this case, you can force the port to toggle to the MSTP mode by performing the
mCheck operation on the port.
Prerequisites MSTP runs normally on the switch.
Configuration Procedure You can perform the mCheck operation in the following two ways.