Avaya P580 - Manual (Page 157)

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, Version v5.3.1 4-27
Using VLANs, Spanning Tree, Hunt Groups, and VTP Snooping
Figure 4-14. Switch Port Configuration Window
4. From the Spanning Tree pull-down menu, for the Spanning
Tree Mode parameter select Disable.
5. Click Apply to disable spanning tree mode on the port, or
CANCEL to keep spanning tree mode enabled on the port.