Switch Configuration Guide

Spanning Tree Configuration Command Set
Configuring Spanning Tree Bridge Parameters
6-8 Matrix NSA Series Configuration Guide
clear spantree newroottrapenable (Section 6.2.1.73)
clear spantree default (Section 6.2.1.74)
show spantree debug (Section 6.2.1.75)
clear spantree debug (Section 6.2.1.76)