sfptpd supports PTP packets over tagged 802.1Q
Virtual Local Area Network (VLAN) interfaces. You should consult the relevant OS
documentation for VLAN configuration instructions. Assuming interface eth2.120 is a network interface configured with VLAN tag
120, the following example identifies sfptpd VLAN
configuration.
./sfptpd -i eth2.120 -f config/ptp_slave.cfg