H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 201)

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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 specified
ports
stp interface interface-list
instance instance-id port priority
priority
Required
The default port priority is 128.
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 port
stp [ instance instance-id ] port
priority priority
Required.
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
system-view
[device] stp interface GigabitEthernet1/0/1 instance 1 port priority 16
2) Perform this configuration in Ethernet port view
system-view
[device] interface GigabitEthernet1/0/1
[device-GigabitEthernet1/0/1] stp instance 1 port priority 16
Specifying Whether the Link Connected to a Port Is a Point-to-point Link
Refer to Specifying Whether the Link Connected to a Port Is Point-to-point Link .