SPAN port aggregation in FreeBSD

/etc/rc.conf:

ifconfig_em0="up promisc mtu 9212"
ifconfig_em1="up promisc mtu 9212"
cloned_interfaces="lagg0"
ifconfig_lagg0="laggproto loadbalance laggport em0 laggport em1 promisc monitor up mtu 9212"

usage: tcpdump -i lagg0 …

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