EXFO FTB-8500 Series for FTB-500 - Manual (Page 163)

Port Tabs
Ethernet and Fibre Channel Application 149
Network
Source MAC Configuration
MAC Address: A default and unique Media Access Control (MAC) address
is automatically given to the Ethernet port. Select the MAC Address field if
the MAC address has to be changed for this port and enter the new MAC
address.
Note: This MAC address will be used as the source MAC address for all streams.
VLAN

VLAN: When selected, allows the configuration of VLAN. The VLAN
check box is not selected by default.

Config button: Allows VLAN parameters configuration. Refer to VLAN
Configuration on page 480 for more information.