I have spent some time for setting the lagg interface as described in the FreeBSD Handbook : Example 31.3. Failover Mode Between Ethernet and Wireless Interfaces.
For the correct operation of the lagg interface I have modified the /usr/local/etc/dsbdriverd/config.lua
file adding the line enable_netconfig = false
.
Please add a note in the documentation.
Regards
Maurizio