Dell PowerEdge M420 Reference Manual page 1590

Default Configuration
This command has no default configuration.
Command Mode
User EXEC mode
User Guidelines
This command has no user guidelines.
Example
The following example displays a system version (this version number is only
for demonstration purposes).
console>show version
Image Descriptions
image1 : default image
image2 :
Images currently available on Flash
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unit image1
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1 K.3.9.1
2 K.3.9.1
stack
Stack commands are supported by PCM6220 and PCM6348 switches.
Use the stack command in Global Configuration mode to set the mode to
Stack Global Config.
Syntax
stack
Default Configuration
This command has no default mode.
1586
System Management Commands
image2 current-active
0.0.0.0 image1
0.0.0.0 image1
next-active
image1
image1