● 7: br0
                 NetDev File: /etc/systemd/network/br0.netdev
                   Link File: /usr/lib/systemd/network/99-default.link
                Network File: /etc/systemd/network/br0.network
                       State: degraded (configuring)
                Online state: online
                        Type: bridge
                        Kind: bridge
                      Driver: bridge
            Hardware Address: de:31:ab:6f:8f:23
                         MTU: 1500 (min: 68, max: 65535)
                       QDisc: noqueue
IPv6 Address Generation Mode: eui64
               Forward Delay: 15s
                  Hello Time: 2s
                     Max Age: 20s
                 Ageing Time: 5min
                    Priority: 32768
                         STP: no
      Multicast IGMP Version: 2
                        Cost: 2000
                 FDB Learned: 1
             FDB Max Learned: 0
                  Port State: disabled
    Number of Queues (Tx/Rx): 1/1
            Auto negotiation: no
                       Speed: 10Gbps
                     Address: fe80::dc31:abff:fe6f:8f23
           Activation Policy: up
         Required For Online: yes
          DHCPv6 Client DUID: DUID-EN/Vendor:0000ab11190b563f12714c2d

Oct 09 11:12:37 kings systemd-networkd[493]: br0: netdev ready
Oct 09 11:12:37 kings systemd-networkd[493]: br0: Configuring with /etc/systemd/network/br0.network.
Oct 09 11:12:37 kings systemd-networkd[493]: br0: Link UP
Oct 09 11:12:41 kings systemd-networkd[3368]: br0: Link UP
Oct 09 11:12:41 kings systemd-networkd[3368]: br0: Configuring with /etc/systemd/network/br0.network.
Oct 09 11:12:41 kings systemd-networkd[3368]: br0: netdev ready
Oct 09 11:29:03 kings systemd-networkd[3368]: br0: Gained carrier
Oct 09 11:29:04 kings systemd-networkd[3368]: br0: Gained IPv6LL