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

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 10 May 2022 08:22:38 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261100

--- Comment #2 from Rumen Palov <rpalov@e-card.bg> ---
Hello all,

the reason for not receiving traffic in FreeBSD 13.0 / 13.1 is the present vlan
devices in cloned_interfaces pragma in /etc/rc.conf. 

When we remove the vlans from cloned_interfaces they are working properly.

To be more clear, when we have configuration like this, after update from
FreeBSD 12 to FreeBSD 13, vlans stop working: 

cloned_interfaces="lagg0 vlan100"
vlans_lagg0="vlan100"
..........
create_args_vlan100="vlan 100 vlandev lagg0"
ifconfig_vlan100="inet 192.168.0.1/24"

When we remove the vlan100 from cloned_interfaces, vlans start working.

Until FreeBSD 13 they are working even present in cloned_interfaces.

What change is affecting that behavior ?

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