Starting from Firmware version 3.8 cnPilot Enterprise APs include support for LLDP (Link Layer Discovery Protocol) so the APs can be L2-discovered by LLDP capable switches and other devices. LLDP helps convey basic information about the Access Point including its model, hostname, and the interface name of the link where this packet was transmitted.
On the wire these packets use a standard multicast destination MAC address of 01-80-C2-00-00-0E and an ether type of 0x88CC. They are transmitted once every 60 seconds, this interval is currently not configurable.
The contents of a typical LLDP packet, in this case from a cnPIlot e410 Access Point, as seen in a wireshark capture are:
LLDP transmission is enabled by default on all the ethernet ports of the AP, it can be turned off in System settings if necessary: