EXFO FTB-8500 Series for FTB-500 - Manual (Page 235)

Stream Generation Tabs
Ethernet and Fibre Channel Application 221
MPLS
MPLS
Allows MPLS configuration of streams with up to two layers of MPLS labels,
COS/EXP and TTL parameters.
Note: MPLS has to be enabled during the test setup (refer to MPLS on page 104)
and the Network set to MPLS/IPv4, MPLS/IPv6, or MPLS/None (see
Stream Configuration on page 207) to gives access to the MPLS
configuration for the selected stream.
Press TEST, Stream Gen, and MPLS.
Stream No.
Select the stream number from the list.