Description: This lab exercise demonstrates configuring
port-priority for an interface on a switch.
1. Enter into interface configuration mode on SW1
2. Issue the command "spanning-tree port-priority
<priority-value> to configure port-priority on the specified interface
3. Use the command "show spanning-tree vlan <vlan-id>"
to verify the configuration
Note: Port-Priority can be between 0 and 255, default is 128,
the lower the number, higher is the priority.