lldpd(8) on Linux
The text 686bd6e85a21, as Debian 9 (Stretch) shipped it.
LLDP daemon
Flags it lists
-
-C -
-D -
-H -
-I -
-L -
-M -
-P -
-S -
-X -
-c -
-d -
-e -
-f -
-i -
-k -
-l -
-m -
-p -
-r -
-s -
-u -
-v -
-x