IPv6 and ndp command

[Gunnar Olsson]

Hi,
I'm trying to force an ethernet address to an IPv6 node, with the ndp
command, but getting following message: 

xelfc1# ndp -s fe80::2bd:d4ff:fe77:8 00:ca:ad:04:00:00
writing to routing socket: No such process
fe80::2bd:d4ff:fe77:8: No such process
xelfc1#

(I have no problem to read entries via ndp -a)

If someone has an answer to my problem, please mail me!
I do have tried to search for an answer in the mail archive, but with no
success.

Best Regards
Gunnar