A configuration with one ethernet (wire) interface and one hotplug Wi-Fi interface.

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

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

allow-hotplug wlan0
iface wlan0 inet manual
	bond-master bond0
	bond-mode 1
	bond-miimon 100
	bond-give-a-chance 10
	wpa-bridge bond0
	wpa-key-mgmt WPA-PSK
	wpa-proto WPA
	wpa-group CCMP
	wpa-ssid my-ssid
	wpa-psk "my-secret-password"

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

You do not need an "iface eth0" stanza.

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

The "wpa-bridge bond0" stanza is required to inform wpa_supplicant that Wi-Fi link-level packets will arrive on bond0, not on wlan0.
The "bond-give-a-chance 10" stanza is required to give a chance for Wi-Fi authentication to succeed.
