Command Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration Commands
1-28
[Sysname] stp port-log instance 2
%Aug 16 00:49:41:856 2006 Sysname MSTP/3/PDISC: Instance 2's
GigabitEthernet2/0/1 has been set to discarding state!
%Aug 16 00:49:41:856 2006 Sysname MSTP/3/PFWD: Instance 2's
GigabitEthernet2/0/2 has been set to forwarding state!
// The information above shows that in instance 2, the state of GigabitEthernet 2/0/1
has changed to discarding and that of GigabitEthernet 2/0/2 has changed to
forwarding.
1.1.29 stp port priority
Syntax
stp [ instance instance-id ] port priority priority
undo stp [ instance instance-id ] port priority
View
Ethernet interface view, port group view
Parameters
instance instance-id: Sets the priority of the current port(s) in a particular spanning tree
instance. The effective range of instance-id is 0 to 31, with 0 representing the CIST.
priority: Port priority, in the range of 0 to 240 at the step of 16 (0, 16, 32…, for example).
Description
Use the stp port priority command to set the priority of the port(s).
Use the undo stp port priority command to restore the system default.
By default, the port priority is 128.
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 ports in the port group.
If you set instance-id to 0, you are setting the priority of the port in the CIST. The priority
of a port can affect the role selection of the port in the specified spanning tree instance.
Setting different priorities for the same port in different spanning tree instances allows
different VLAN traffic flows to be forwarded along different physical links, thus to enable
per-VLAN load balancing.
When the priority of a port is changed, MSTP will re-compute the role of the port and
initiate a state transition.
If you do not provide instance instance-id, your configuration will take effect in the CIST
instance only.
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