Like this, but then with bonding:

# The loopback network interface
auto lo
iface lo inet loopback
auto bond0
# The primary network interface
iface bond0 inet manual
  slaves eth0 eth1
  bond-mode active-backup
  bond-miimon 100
  bond-downdelay 200
  bond-updelay 200
auto xenbr0
iface xenbr0 inet static
  bridge_ports bond0
  bridge_fd 0

I needed it because I had have a dedicated server that was setup with ethernet bonding that I wanted to install Xen on. Normally, you can let xen setup the network with “network-script network-bridge” in /etc/xen/xend-config.xsp, but that doesn’t work when you have bonding. And, it’s actually better to do it with Debian’s netconfig anyway.