When you deploy some critical stuffs like Oracle DB, Oracle RAC DB etc on the Xen or Oracle virtual machine, you'll have to use bonded network interfaces and the vlan trunks. By default, Xen and Oracle VM doesn't support the xen bridges created on bonded-vlaned-interfaces. The below document gives you a clear idea on how to create and configure xen bridges on bonded and vlan trunked interfaces.
- Xen wiki document on bonded-vlaned xen network configuration
- Oracle VM server configuration for bonded & trunked interfaces
