pfSense » pfSense Plus

In FreeBSD 13 and newer ifconfig includes the ability to set a PCP value on an interface directly. That allows sending priority only tagged traffic (vlan0).

This works fine in pfSense 2.7/22.11 from the CLI:

[22.11-DEVELOPMENT][admin@4100.stevew.lan]/root: ifconfig igc1 pcp 4
[22.11-DEVELOPMENT][admin@4100.stevew.lan]/root: ifconfig igc1 
igc1: flags=8863<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
    description: LAN2
    options=4e120bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER,RXCSUM_IPV6,TXCSUM_IPV6,NOMAP>
    ether 90:ec:77:1f:8a:62
    pcp 4
    inet6 fe80::92ec:77ff:fe1f:8a62%igc1 prefixlen 64 scopeid 0x2
    inet 10.14.0.1 netmask 0xffffff00 broadcast 10.14.0.255
    media: Ethernet autoselect
    status: no carrier
    nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

A field should be added in the GUI and config to allow setting it.