From MikroTik Wiki
List of all discovered nodes by IPv6 neighbor discovery protocol (neighbor cache).
[admin@test_host] /ipv6 neighbor> print Flags: R - router 0 address=ff02::5 interface=main mac-address=33:33:00:00:00:05 status="noarp" 1 address=ff02::1 interface=main mac-address=33:33:00:00:00:01 status="noarp" 2 R address=fe80::d7:4cff:fec1:2e32 interface=main mac-address=00:0C:42:28:79:45 status="stale"
|address (ipv6 address)||link-local address of the node.|
|inteface (string)||Interface on which node was detected.|
|mac-address (string)||Mac address of discovered node.|
|router (yes | no)||Whether discovered node is router|
|status (noarp | incomplete | stale | reachable | delay | probe)||Status of the cached entry: