Enabling Designated Protection on a Port

  1. To disallow the designated forwarding state on a port in STP (802.1d or 802.1w), run the spanning-tree designated-protect command in interface configuration mode for that port.

The following example shows that the designated forwarding state is disallowed on Ethernet interface 1/1/1. 

device(config)# ethernet interface 1/1/1
device(config-if-e1000-1/1/1)# spanning-tree designated-protect
Parent topic: Designated Protection