Dell S4048–ON Configuration Manual page 936

Example of Viewing STP Guard Configuration
Dell#show spanning-tree 0 guard
Interface
Name Instance Sts
--------- -------- --------- ----------
Te 1/1 0 INCON(Root)
Te 1/2 0 LIS
Te 1/3 0 EDS (Shut)
936 Spanning Tree Protocol (STP)
Guard type
Rootguard
Loopguard
Bpduguard