STP configuring portfast
To configure STP PortFast on a Cisco device running STP, there are two approaches:
The spanning-tree portfast edge
command can be applied either globally or on an interface.
When applied globally, the syntax is as follows:
spanning-tree portfast edge { bpdufilter default | bpduguard default | default }
When applied on an interface, the syntax is like so:
spanning-tree portfast edge [ disable | trunk ]
The interface configuration always overrides the global configuration. If no such command appears in the interface configuration, then the global configuration takes effect.
Links
https://forum.networklessons.com/t/rapid-spanning-tree-configuration/1139/23?u=lagapides