Bridge networking

auto dummy0
iface dummy0 inet manual         [Fake interface to bridge on instead eth0 who might not support bridging]  
    up ip link set $IFACE address 3a:11:9d:4d:d7:64

auto brlan
iface brlan inet static         [Internal interface = bridge]   
    address 192.168.2.1       [Internal DOM0 IP]
    netmask 255.255.255.0     [Internal network mask]
    network 192.168.2.0       [Internal network]
    broadcast 192.168.2.255   [Internal broadcast]
    bridge_ports dummy0       [Bridge on dummy]
    bridge_stp off
    bridge_maxwait 0

Commands

Create an image :
xen-create-image --hostname=agnes --size=20Gb --swap=512Mb --ip=192.168.2.6 --memory=256Mb --arch=amd64 --install-method=debootstrap --lvm=vg0 --dist=jessie --force
You can change default parameter of create-image in :
/etc/xen-tools/xen-tools.conf