spanning-tree tcn-guard

Description

Disables propagation of topology change notifications (TCNs) to other STP ports. Use this when you do not want topology changes to be noticed by peer devices.

The no form of this command, enables propagation of topology changes. By default, propagation is disabled.

Command context

config-if

Authority

Administrators

Examples

Enabling tcn-guard, which disables propagation of topology changes:

switch# config
switch(config)# interface 1/1/1
switch(config-if)# spanning-tree tcn-guard

Disabling tcn-guard, which enables propagation of topology changes:

switch# config
switch(config)# interface 1/1/1
switch(config-if)# no spanning-tree tcn-guard