When setting up interface bonding on dom0, the default 'network-bridge' script may cause bonded network interfaces to alternately switch between 'unavailable' and 'available'. This occurrence is commonly known as flapping.
To prevent this, replace the standard network-script line in /etc/xen/xend-config.sxp with the following line:
(network-script network-bridge-bonding netdev=bond0)
Doing so will disable the netloop device, which prevents Address Resolution Protocol (ARP) monitoring from failing during the address transfer process.