3Com WX3000 operation manual Configuring Port Priority, Configure port priority in system view

[device] stp pathcost-standard dot1d-1998

2)Perform this configuration in Ethernet port view

<device> system-view

[device] interface GigabitEthernet1/0/1 [device-GigabitEthernet1/0/1] undo stp instance 1 cost

[device-GigabitEthernet1/0/1] quit [device] stp pathcost-standard dot1d-1998

Configuring Port Priority

Port priority is an important criterion on determining the root port. In the same condition, the port with the smallest port priority value becomes the root port.

A port on an MSTP-enabled device can have different port priorities and play different roles in different spanning tree instances. This enables packets of different VLANs to be forwarded along different physical paths, so that VLAN-based load balancing can be implemented.

You can configure port priority in one of the following two ways.

Configure port priority in system view

Follow these steps to configure port priority in system view:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Configure port priority for	stp interface interface-list	Required
	instance instance-idport
specified ports		The default port priority is 128.
	priority priority

Configure port priority in Ethernet port view

Follow these steps to configure port priority in Ethernet port view:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Enter Ethernet port view	interface interface-type	—
	interface-number
Configure port priority for the	stp [ instance instance-id]	Required.
port	port priority priority	The default port priority is 128.

Changing port priority of a port may change the role of the port and put the port into state transition.

A smaller port priority value indicates a higher possibility for the port to become the root port. If all the ports of a device 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 recalculation.

You can configure port priorities according to actual networking requirements.

Configuration example

# Configure the port priority of GigabitEthernet 1/0/1 in spanning tree instance 1 to be 16.

1)Perform this configuration in system view

<device> system-view

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