Lenovo ThinkSystem NE2552E Application Manual page 61

7. Turn Spanning Tree Protocol on or off at the prompt:
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Enter the seconds as a number from 00 to 59. To keep the current second, press
<Enter>. The system then displays the date and time settings:
System clock set to 8:55:36 Wed Jan 28, 2012.
Spanning Tree:
Current Spanning Tree Group 1 setting: ON
Turn Spanning Tree Group 1 OFF? [y/n]
Enter y to turn off Spanning Tree, or enter n to leave Spanning Tree on.
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Chapter 2: Initial Setup