This object reports the major version number of the Salix/Harmonic network element agent software running on the device; the source DESCRIPTION text for this object is copy-pasted from an unrelated download-table object and does not actually describe a version number, so its meaning should be treated as inferred from the object's name and placement under hneAgent rather than fully confirmed by its documentation. An administrator would use this value, alongside the sub-version object, to identify the agent software release for compatibility checks. For example, an unexpectedly low hneAgentMajorVersion reading compared to sibling devices in the same head-end could indicate that unit is overdue for an agent software upgrade.