3Com MSR 30, MSR 50 manual Stp priority, Stp instance instance-id priority priority

620CHAPTER 38: MSTP CONFIGURATION COMMANDS

■If you set instance-idto 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 MST instance.

■Setting different priorities for the same port in different MST 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.

Examples # Set the priority of port Ethernet 1/3 in MST instance 2 to 16.

<Sysname> system-view

[Sysname] interface Ethernet 1/3

[Sysname-Ethernet1/3] stp instance 2 port priority 16

stp priority

Syntax	stp [ instance instance-id] priority priority
	undo stp [ instance instance-id] priority
View	System view
Parameters	instance instance-id: Sets the priority of the current port(s) in a particular
	spanning tree instance. The minimum value of instance-idis 0, representing the
	CIST, and the maximum value of instance-idis 15.
	priority: Port priority, in the range of 0 to 61440 at the step of 4096, namely you
	can set up to 16 priority values, such as 0, 4096, 8192..., on the device.
Description	Use the stp priority command to set the priority of the device.
	Use the undo stp priority command to restore the device priority to the default
	setting.
	By default, the device priority is 32768.
	The device priority is involved in spanning tree computing. The device priority is set
	on a per-instance basis. An MSTP-compliant device can have different priorities in
	different MST instances.
	If you do not provide instance instance-id, your configuration will take effect in
	the CIST instance only.
Examples	# Set the device priority in MST instance 1 to 4096.
	<Sysname> system-view
	[Sysname] stp instance 1 priority 4096