I've installed xen on debian wheezy 7.0 virtualbox machine with three network interfaces: echo 'xcp-networkd xcp-xapi/networking_type select bridge' | debconf-set-selections apt-get --no-install-recommends -q -y --force-yes install xcp-networkd apt-get --no-install-recommends -q -y --force-yes install linux-headers-3.2.0-4-amd64 xen-hypervisor- apt-get --no-install-recommends -q -y --force-yes install xcp-xapi xcp-xe xcp-guest-templates xcp-vncterm xen-tools blktap-utils blktap-dkms qemu-keymaps qemu-utils echo "bridge" > /etc/xcp/network.conf update-rc.d xendomains disable echo TOOLSTACK=xapi > /etc/default/xen When the system boots, in addition to eth0, eth1 and eth3, I have three bridge interfaces xenbr0, xenbr1 and xenbr2. How and when are there bridges created, when xen installs, or when it starts up? Is there any documentation that describes this behavior? Many thanks, Chris