The switch software use a standardized dot notation format.
Software image names use the following number format to identify release and maintenance values:
Product Name.Major Release.Minor Release.Maintenance Release.Maintenance Release Update.tgz
For example, the image file name VOSS4900.8.1.5.0.tgz denotes a software image for the VSP 4900 Series product with a major release version of 8, a minor release version of 1, a maintenance release version of 5 and a maintenance release update version of 0. TGZ is the file extension.