For the Interface Module, the following operational state information can be fetched:
module: operconfig-interfaces
path: /interfaces/interface[name=<ifname>]/state
module: operconfig-interfaces
+--rw interfaces
+--rw interface* [name]
+--rw name --> ../config/name
| +--ro name? string
| +--ro mtu? uint16
| +--ro loopback-mode? boolean
| +--ro description? string
| +--ro enabled? boolean
| +--ro ifindex? uint32
| +--ro counters
| | +--ro in-octets? oc-yang:counter64
| | +--ro in-unicast-pkts? oc-yang:counter64
| | +--ro in-broadcast-pkts? oc-yang:counter64
| | +--ro in-multicast-pkts? oc-yang:counter64
| | +--ro in-discards? oc-yang:counter64
| | +--ro in-errors? oc-yang:counter64
| | +--ro in-fcs-errors? oc-yang:counter64
| | +--ro out-octets? oc-yang:counter64
| | +--ro out-unicast-pkts? oc-yang:counter64
| | +--ro out-broadcast-pkts? oc-yang:counter64
| | +--ro out-multicast-pkts? oc-yang:counter64
| | +--ro out-discards? oc-yang:counter64
| | +--ro out-errors? oc-yang:counter64