Configuring and Verifying STP
Now that you're familiar with STP's components and operations, let's discuss how to configure STP on your Catalyst switch. The following sections will cover how to tune 802.1D STP parameters to optimize STP for your network layout.
Enabling and Disabling STP
By default, STP is enabled for every VLAN on Cisco's switches. STP can be globally enabled or disabled or on a per-VLAN basis. If a switch has only one connection to a switched network or is not part of a loop, STP could be disabled to decrease the likelihood of STP convergence problems disrupting services. However, care must be taken if you choose to take this approach.
Because of issues with loops, Cisco recommends that you leave STP enabled—even if no loops ...