A configuration with two hotplug ethernet (wire) interfaces.

-----8<----------8<----------8<----------8<----------8<-----

auto eth0
iface eth0 inet manual
	bond-master bond0

auto eth1
iface eth1 inet manual
	bond-master bond0

auto bond0
iface bond0 inet dhcp
	bond-mode 1
	bond-miimon 100
	bond-primary eth0 eth1

-----8<----------8<----------8<----------8<----------8<-----

The "auto bond0" stanza is required, else bond0 won't bring up.