How to change Spanning Tree Port Priority Value

Default Spanning Tree Port Priority value is 128. Sometime, it may necessary to change the Spanning Tree Port Priority value to fine tune Spanning Tree Protocol.

We can change the Spanning Tree Port Priority value, using the interface configuration commad "spanning-tree vlan <vlan_no> port-priority <port_priority_value>", as shown below.

You may change the Spanning Tree Port Priority value only in increments of 16.

omnisecu.com.SW1>en
omnisecu.com.SW1>enable 
omnisecu.com.SW1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
omnisecu.com.SW1(config)#interface fa0/23
omnisecu.com.SW1(config-if)#spanning-tree vlan 1 port-priority 16
omnisecu.com.SW1(config-if)#exit
omnisecu.com.SW1(config)#exit