Enabling or disabling STP in a port-based VLAN
Use the following procedure to disable or enable STP on a device on which you have configured a port-based VLAN. Changing the STP state in a VLAN affects only that VLAN.
To enable STP for all ports in a port-based VLAN, enter commands such as the following.
device(config)# vlan 10 device(config-vlan-10)# spanning-tree