EXFO FTB-8500 Series for FTB-200 - Manual (Page 145)

I/F Setup Tabs
Ethernet and Fibre Channel Application 131
Network Setup
For IPv6:

Displays the Link-Local IPv6 Address, Global IPv6 Address, and
Default Gateway Address.

IPv6 Config button allows to configure the IPv6 addresses. Refer to
IPv6 Address Configuration on page 443 for more information.
MPLS
MPLS settings are only available when MPLS is enabled from the test setup
and allow to transmit and receive management frames (ex: PING) inside a
core MPLS network.

Label TX and RX: Allows the selection of the interface MPLS TX and
RX labels (0 to 1048575). The default label value is 16 for both TX and
RX. The TX and RX labels are available when the MPLS check box from
the test setup is selected.
PBB-TE
PBB-TE settings are only available when PBB-TE is enabled from the test
setup and allow to configure the interface source and destination
parameters allowing to exist on a PBB-TE network. Refer to PBB-TE
Interface configuration on page 439 for more information.