Check manual page of emcvnx_info.link
EMC VNX Storage: Information about the management port settings
Reports information about the management port settings like the link
status, current speed, and auto-negotiation.
This subcheck always returns the status OK.
The information is retrieved by the special agent agent_emcvnx which uses
EMC's command line tool naviseccli.
Finds exactly one item on every EMC VNX storage system called EMC VNX Link