Avaya AP-6 - Manual (Page 105)

System
Avaya Wireless AP-4/5/6 User’s Guide 4-7
Access Points provide DDNS support by adding the host name (option
12) in DHCP Client messages, which is used by the DHCP server to
dynamically update the DNS server.
Access Point System Naming Convention
The Access Point's system name is used as its host name. In order to
prevent Access Points with default configurations from registering similar
host names in DNS, the default system name of the Access Point is
uniquely generated. Access Points generate unique system names by
appending the last 3 bytes of the Access Point's MAC address to the
default system name.