Cisco IE-3000-8TC Command Reference Manual page 737

Appendix B IE 3000 Switch Debug Commands
Usage Guidelines The undebug spanning-tree command is the same as the no debug spanning-tree command.
Related Commands Command
show debugging
show spanning-tree
OL-13019-01
Description
Displays information about the types of debugging that are enabled.
Displays spanning-tree state information.
Cisco IE 3000 Switch Command Reference
debug spanning-tree
B-59