[ no ] dhcp-external duplicate-mac-address
Command introduced in JUNOSe Release 9.3.0.
Configures the DHCP external server application to use a combination of the MAC address and the gateway IP address (giaddr) to uniquely identify DHCP clients attached to the router. This behavior is also referred to as duplicate MAC mode. The no version restores the default behavior, also known as unique MAC mode, which uses only the MAC address to uniquely identify DHCP clients.