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Cisco IE 3000 Switch Command Reference
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Chapter 2    IE 3000 Switch  Cisco IOS Commands
  spanning-tree loopguard default
Related Commands Command Description
show running-config Displays the current operating configuration. For syntax information, 
select Cisco IOS Configuration Fundamentals Command Reference, 
Release 12.2 > File Management Commands > Configuration File 
Management Commands. 
spanning-tree guard loop Enables the loop guard feature on all the VLANs associated with the 
specified interface.