libvirt/tests/networkxml2xmlin/routed-network.xml

<network>
  <name>local</name>
  <uuid>81ff0d90-c91e-6742-64da-4a736edb9a9b</uuid>
  <bridge name="virbr1" />
  <forward mode="route" dev="eth1"/>
  <ip address="192.168.122.1" netmask="255.255.255.0">
    <dhcp>
      <range start="192.168.122.2" end="192.168.122.254" />
    </dhcp>
  </ip>
</network>