B.11. Unable to add bridge br0 port vnet0: No such device
B.11. Unable to add bridge br0 port vnet0: No such device Symptom The following error message appears: For example, if the bridge name is br0 , the error message will appear as: In libvirt versions 0.9.6 and earlier, the same error appears as: Or for example, if the bridge is named br0 : Investigation Both error messages reveal that the bridge device specified in the guest's (or domain's) <interface> definition does not exist. To verify the bridge device listed in the error message does not exist, use the shell command ip addr show br0 . A message similar to this confirms the host has no bridge by that name: If this is the case, continue to the solution. However, if the resulting message is similar to the following, the issue exists elsewhere: Solution Edit the existing bridge or create a new bridge with virsh Use virsh to either edit the settings of an existing bridge or network, or to add the bridge device to the host system configuration. Edit the existing bridge settings using virsh Use virsh edit name_of_guest to change the <interface> definition to use a bridge or network that already exists. For example, change type='bridge' to type='network' , and <source bridge='br0'/> to <source network='default'/> . Create a host bridge using virsh For libvirt version 0.9.8 and later, a bridge device can be created with the virsh iface-bridge command. This will create a bridge device br0 with eth0 , the physical network interface which is set as part of a bridge, attached: Optional: If desired, remove this bridge and restore the original eth0 configuration with this command: Create a host bridge manually For older versions of libvirt , it is possible to manually create a bridge device on the host. Refer to Section 11.3, "Bridged Networking with libvirt" for instructions.
Unable to add bridge name_of_bridge port vnet0: No such device Unable to add bridge br0 port vnet0: No such device Failed to add tap interface to bridge name_of_bridge : No such device Failed to add tap interface to bridge 'br0' : No such device br0 : error fetching interface information: Device not found 3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 1b:c4:94:cf:fd:17 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global br0 virsh iface-bridge eth0 br0 virsh iface-unbridge br0