CONFIGURING PORTFAST AND BPDUGUARD IN SWITCH INTERFACES
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Try the below commands only to access ports (not for trunk ports)
Portfast should be configured to only those ports which connects to server/pc/workstation
not to the ports which connected to switches/routers
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Switch(config) # interface range GigabitEthernet 3/1 – 24

Switch (config-if)# Spanning-tree portfast

Switch (config-if)# Spanning-tree bpduguard enable



Switch(config) # interface range GigabitEthernet 4/1 – 24

Switch (config-if)# Spanning-tree portfast

Switch (config-if)# Spanning-tree bpduguard enable