Hi Folks,
As per my understanding the tester gets the post information by CDP/LLDP/EDP from your managed switches. Based on the switch [cisco/juniper/hp/etc] basically default deployed on standard or proprietary protocol that switch handles we need to tweak the tester to detect the port.
Datasheet: LinkRunner™ AT
Nearest switch and VLAN information — uses IEEE Link Layer Discovery Protocol (LLDP) plus the Cisco® and Extreme Discovery Protocols (CDP and EDP) to display the VLAN and nearest switch model, slot and port.