[Bug 191380] New: Problem with tagged vlan after upgrading

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191380

            Bug ID: 191380
           Summary: Problem with tagged vlan after upgrading
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: riccp at ige.unicamp.br

After upgrading my system to 11.0-CURRENT r267824, I cannot use the vlan
interfaces as I used before. I have in rc.conf:

ifconfig_em0="media 1000baseT mediaopt full-duplex"
cloned_interfaces="vlan1 vlan2 vlan100 vlan150"
ifconfig_vlan1="inet 10.0.0.20 netmask 255.0.0.0 vlan 1 vlandev em0"
ifconfig_vlan2="inet X.X.X.X netmask 255.255.255.192 vlan 2 vlandev em0"
ifconfig_vlan100="vlan 100 vlandev em0"
ifconfig_vlan150="inet 192.168.2.10 netmask 255.255.255.0 vlan 150 vlandev em0"

But this isn't working anymore.

When I remove the vlan tag in my switch and set the inet to the em0
card, everithing works fine.

The hardware:

em0 at pci0:0:25:0:  class=0x020000 card=0xe0001458 chip=0x153b8086 rev=0x04
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection I217-V'
    class      = network
    subclass   = ethernet

Everything got back to normal after the command below:

# ifconfig em0 -vlanhwtag

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