etherswitchcfg(8) on FreeBSD
The text 1c7f5da6877e, as FreeBSD 11.2-RELEASE shipped it.
configure a built-in Ethernet switch
Flags it lists
-
-addtag -
-doubletag -
-dropuntagged -
-firstlock -
-ingress -
-m -
-striptag -
-v