9. Spanning-Tree
Spanning-tree vlan 16 root primary
Interface f0/0
Spanning-tree vlan 16 port-priority 32
Interface f0/1
Spanning-tree vlan 16 port-priority 16
VLAN 16 should be transit on F0/1, when F0/1 down, traffic go over port F0/0
10. Spanning-Tree uplinkfast
Spanning-Tree uplink fast provides fast reconvergence in the event of direct failure the root port
Continues forwarding within 3 seconds
3. udld port aggressive
To enable UDLD on fiber optic interface issues the global configuration command udld enable or udld aggressive. To enable UDLD on a copper interface issue the interface command udld port aggressive