The default for Span Guard Autounlock is enabled.
All command modes.
Span Guard Autounlock sets the automatic unlocking of spanguard-locked ports when operstatus is not up (for example, link loss). When the value is enable the port becomes unlocked. When the value is disable the port remains locked until manually unlocked using this command or the set spantree spanguard-autounlock command.
This example restores the default (enabled) for Span Guard Autounlock:
clear spantree spanguard-autounlock