How to enable Spanning Tree Portfast in Cisco Catalyst switch (IOS)

http://www.itsyourip.com/cisco/how-to-enable-spanning-tree-portfast-in-cisco-catalyst-switch-ios/

STP Portfast is a feature in Cisco IOS which allows a switchportwhich is participating in STP to directly transition from Blockingmode  to Forwarding mode when a device connects and the link goes up.This can improve the initial connect time and can fix some issues withWindows based devices connecting to the Active Directory domains.

STP Portfast is ideal for ports which connects directly attacheddevices and certainly not for the ports which connects a hub or aswitch. Hence, good to set switchports that directly connect enddevices on your Access switch.

To enable STP Portfast in Cisco Catalyst switches running Cisco IOS

Enter Interface Configuration Mode

ciscoswitch# conf term

ciscoswitch(config)# int gigabitethernet 1/10

ciscoswitch(config-if)# no shut

NOTE: If the port was initially shutdown

Force the switchport mode to Access

ciscoswitch(config-if)# switchport mode access

Enabled Portfast

ciscoswitch(config-if)# spanning-tree portfast
%Warning: portfast should only be enabled on ports connected to a
single host. Connecting hubs, concentrators, switches, bridges, etc…
to this interface when portfast is enabled, can cause temporary
bridging loops. Use with CAUTION

%Portfast has been configured on GigabitEthernet1/10 but will only have effect when the interface is in a non-trunking mode.

Enable BPDU Guard

BPDU guard protects against a switching loop. On a switchport withBPDU Guard, when a BPDU arrives, the port will be shut down and placedinto error disabled (err-disabled) state. This port needs to be enabledmanually later on.

ciscoswitch(config-if)# spanning-tree bpduguard enable

This should enabled Spanning tree portfast in a Cisco Catalyst switch running Cisco IOS