https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230996
Brock Williams <br...@cottonwoodcomputer.com> changed:

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                 CC|                            |br...@cottonwoodcomputer.co
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--- Comment #20 from Brock Williams <br...@cottonwoodcomputer.com> ---
We're seeing the same, or at least very similar, issue on 13.0-RELEASE.  In our
case, we only have the problem if the port is in gigabit mode.  If we limit the
switch to 100, we don't see the issue.

Our configuration is passing a vlan over a bridge interface:

ifconfig_igb0="DHCP"
ifconfig_igb1="inet 172.28.1.1 netmask 255.255.255.0"
dhcpd_ifaces="igb1"

vlans_igb0="1501"
vlans_igb1="1501"
ifconfig_igb0_1501="up"
ifconfig_igb1_1501="up"

cloned_interfaces="bridge0"
ifconfig_bridge0="addm igb0.1501 addm igb1.1501 up"


Adding -vlanhwtag to igb0 and igb1 resolves it.


pciconf -lv:

igb0@pci0:2:0:0:        class=0x020000 rev=0x03 hdr=0x00 vendor=0x8086
device=0x1533 subvendor=0x15d9 subdevice=0x1533
    vendor     = 'Intel Corporation'
    device     = 'I210 Gigabit Network Connection'
    class      = network
    subclass   = ethernet

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