3com MSR 20-20 참조 매뉴얼

instance instance-id: Enables output of port state transition information for the 
specified instance. The minimum value of instance-id is 0, representing the CIST, 
and the maximum value of this argument depends on the specific device model.

Use the stp port-log command to enable output of port state transition 
information for the specified instance or all instances.

Use the undo stp port-log command to disable output of port state transition 
information for the specified instance or all instances.

Whether this function is enabled by default depends on the specific device model.

# Enable output of port state transition information for instance 2.

<Sysname> system-view

[Sysname] stp port-log instance 2

%Aug 16 00:49:41:856 2006 Sysname MSTP/3/PDISC: Instance 2’s Etherne

t1/1 has been set to discarding state!

%Aug 16 00:49:41:856 2006 Sysname MSTP/3/PFWD: Instance 2’s Ethernet

1/2 has been set to forwarding state! 

// The information mentioned above shows that in instance 2, that state of both 
Ethernet 1/1 and Ethernet 1/2 has changed to forwarding.

stp [ instance instance-id ] port priority priority

undo stp [ instance instance-id ] port priority

Ethernet interface view, port group view

instance instance-id: Sets the priority of the current port(s) in a particular 
spanning tree instance. The minimum value of instance-id is 0, representing the 
CIST, and the maximum value of instance-id is 15.

priority: Port priority, in the range of 0 to 240 at the step of 16 (0, 16, 32..., for 
example).

Use the stp port priority command to set the priority of the port(s).

Use the undo stp port priority command to restore the default.

By default, the port priority is 128.

Note that:

■

Configured in Ethernet interface view, the setting is effective on the current 
port only; configured in port group view, the setting is effective on all the ports 
in the port group.