[ovirt-users] host status "Non Operational" - how to diagnose & fix?

I have had one of my hosts go into the state “Non Operational” after I rebooted it… I also noticed that in the oVirt webadmin UI, the NIC that’s used in the ‘ovirtmgmt’ network is showing “down”, but in Linux the NIC is operational and up, as is the ‘ovirtmgmt’ bridge… [root@ovirt-node-02 ~]# ip link sh up 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: bond0: <NO-CARRIER,BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT link/ether 00:15:17:7b:e9:b0 brd ff:ff:ff:ff:ff:ff 3: enp4s0f0: <NO-CARRIER,BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc pfifo_fast master bond0 state DOWN mode DEFAULT qlen 1000 link/ether 00:15:17:7b:e9:b0 brd ff:ff:ff:ff:ff:ff 4: enp4s0f1: <NO-CARRIER,BROADCAST,MULTICAST,SLAVE,UP> mtu 1500 qdisc pfifo_fast master bond0 state DOWN mode DEFAULT qlen 1000 link/ether 00:15:17:7b:e9:b0 brd ff:ff:ff:ff:ff:ff 5: enp12s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master ovirtmgmt state UP mode DEFAULT qlen 1000 link/ether 00:21:85:35:08:4c brd ff:ff:ff:ff:ff:ff 7: ovirtmgmt: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT link/ether 00:21:85:35:08:4c brd ff:ff:ff:ff:ff:ff What should I take a look at first?