FreeBSD if bridge Interface Bonding

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FreeBSD's if_bridge supports bonding to create bridge0. In the following example from /etc/rc.conf, physical interfaces sf2 and sf3 are bridged to create a single bridge0 interface. 

ifconfig_sf2="up"
ifconfig_sf3="up"
cloned_interfaces="bridge0"
ifconfig_bridge0="addm sf2 addm sf3 monitor up"

Because bridge0 is created at boot using /etc/rc.conf, bridge0 can be used in /usr/local/etc/rc.d startup scripts at boot.

To create bridge0 outside /etc/rc.conf, try this: 

# ifconfig sf2 up
# ifconfig sf3 up
# ifconfig bridge0 create
# ifconfig bridge0 addm sf2 addm sf3 monitor up

The bridge0 interface looks like this on FreeBSD 6.x: 

$ ifconfig bridge0
bridge0: flags=48843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,MONITOR> mtu 1500
        ether c6:b7:d5:68:dc:d1
        priority 32768 hellotime 2 fwddelay 15 maxage 20
        member: sf2 flags=3<LEARNING,DISCOVER>
        member: sf3 flags=3<LEARNING,DISCOVER>

References

if_bridge man page

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