Are you not curious?
If no RA's are advertised on your LAN (could be any device in theory), you should see something like below:
pi@ph5b:~ $ rdisc6 eth0
Soliciting ff02::2 (ff02::2) on eth0...
Timed out.
Timed out.
Timed out.
No response.
EDIT: But if there are:
$ rdisc6 eth0
[..]
Prefix : fd00::/64
[..]
Recursive DNS server : fd00::3ea6:xxxx:xxxx:xxxx
[..]
Source link-layer address: 3C:A6:2F:XX:XX:XX