Configuring the port priority

The priority of a port is a factor that determines whether the port can be elected as the root port of a device. If all other conditions are the same, the port with the highest priority is elected as the root port.

On a spanning tree device, a port can have different priorities and play different roles in different spanning trees. As a result, data of different VLANs can be propagated along different physical paths, implementing per-VLAN load balancing. You can set port priority values based on the actual networking requirements.

When the priority of a port changes, the system recalculates the port role and initiates a state transition.

To configure the priority of a port:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Layer 2 Ethernet or aggregate interface view.	interface interface-type interface-number	N/A
3. Configure the port priority.	In STP/RSTP mode:stp port priority priority In PVST mode:stp vlan vlan-id-list port priority priority In MSTP mode:stp [ instance instance-list ] port priority priority	The default setting is 128 for all ports.

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Configuration example	home	Configuring the port link type