Can't setup private network with systemd-networkd

I created two files in /etc/systemd/network/

• vbr0.netdev
• vbr0.network

Then I reloaded systemd-networkd, however interface vbr0 is DOWN

vbr0.netdev:

[NetDev] Name=vbr0 Kind=bridge 

vbr0.network:

[Match] Name=vbr0 [Network] DNS=8.8.8.8 Address=192.168.1.1/24 DHCPServer=yes 

ip link show vbr0

5: vbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether d2:1a:32:c1:26:bd brd ff:ff:ff:ff:ff:ff inet 192.168.1.1/24 brd 192.168.1.255 scope global vbr0 valid_lft forever preferred_lft forever inet6 ::ffff:192.168.1.1/0 scope global tentative valid_lft forever preferred_lft forever 

Status of systemd-networkd

systemd-networkd.service - Network Service Loaded: loaded (/lib/systemd/system/systemd-networkd.service; disabled) Active: active (running) since Tue 2015-08-11 12:55:20 CEST; 19h ago Docs: man:systemd-networkd.service(8) Main PID: 21937 (systemd-network) Status: "Processing requests..." CGroup: /system.slice/systemd-networkd.service └─21937 /lib/systemd/systemd-networkd Aug 11 12:55:20 infra systemd-networkd[21937]: veth6cce540 : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: veth839e4d9 : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: veth5dacf8a : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: vethd396754 : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: veth2ba9645 : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: docker0 : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: eth0 : gained carrier Aug 11 12:55:20 infra systemd-networkd[21937]: lo : gained carrier Aug 11 12:55:20 infra systemd[1]: Started Network Service. Aug 11 12:55:20 infra systemd-networkd[21937]: vbr0 : link configured 

systemd version - 215

What's wrong with my config?