[Bug 261100] After update to FreeBSD 13 Stable ( stable/13 aef4a2f5a ) lagg0 stop receiving traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261100

Rudolph <rudolphfroger@dreamsolution.nl> changed:

           What    |Removed                     |Added
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                 CC|                            |rudolphfroger@dreamsolution
                   |                            |.nl

--- Comment #3 from Rudolph <rudolphfroger@dreamsolution.nl> ---
I've got a very similar problem when updating from FreeBSD 12.3 to 13.1. With
FreeBSD 12 our setup with lagg and vlans worked fine.

Snippet from our /etc/rc.conf:

ifconfig_bge0="up"
ifconfig_em0="up"
cloned_interfaces="lagg0"
ifconfig_lagg0="laggproto lacp laggport bge0 laggport em0"
vlans_lagg0="33"
ifconfig_lagg0_33="inet 192.168.0.10/24"
defaultrouter="192.168.0.1"

When I add -vlanmtu to both bge0 and em0 then it seems to works just fine:

ifconfig_bge0="-vlanmtu up"
ifconfig_em0="-vlanmtu up"

Another way we got this to work (without -vlanmtu) is manually issuing
"ifconfig em0 up" and "ifconfig bge0 up" after the machine has booted.

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