Configuring the device priority

Device priority is a factor in calculating the spanning tree. The priority of a device determines whether the device can be elected as the root bridge of a spanning tree. A lower value indicates a higher priority. You can set the priority of a device to a low value to specify the device as the root bridge of the spanning tree. A spanning tree device can have different priorities in different spanning trees.

During root bridge selection, if all devices in a spanning tree have the same priority, the one with the lowest MAC address is selected. You cannot change the priority of a device after it is configured as the root bridge or as a secondary root bridge.

To configure the priority of a device in a specified MSTI:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Configure the priority of the current device.	In STP/RSTP mode:stp priority priority In MSTP mode:stp [ instance instance-list ] priority priority	The default setting is 32768.

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