This variable indicates the software installed on this entity.
For IOS devices, this variable's value is in the IOS Image Naming
Convention format.
IOS Image Naming Convention
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Software images are named according to a scheme that identifies
what's in the image and what platform it runs on. The names have
three parts, separated by dashes: e.g. xxxx-yyyy-ww.
xxxx = Platform
yyyy = Features
ww = Where it executes from and if compressed