adding ipv6 neighbour cache entry: simple ndp -s not worked

A

ant2

May be someboudy point me to the problem.

simple ndp -s failed:
Code: 
>ndp -ns fd32:4e54:3b19::aaa:101 a0:36:9f:a4:dc:e4
ndp: delete: cannot locate fd32:4e54:3b19::aaa:101

I also try
Code: 
> sysctl net.inet6.icmp6.nd6_onlink_ns_rfc4861=1
net.inet6.icmp6.nd6_onlink_ns_rfc4861: 0 -> 1

>ndp -ns fd32:4e54:3b19::aaa:101 a0:36:9f:a4:dc:e4
ndp: delete: cannot locate fd32:4e54:3b19::aaa:101
Why it say "delete"?

Current cache is:
Code: 
>ndp -an
Neighbor                             Linklayer Address  Netif Expire    S Flags
fe80::a236:9fff:fea4:dce4%igb1       a0:36:9f:a4:dc:e4   igb1 22h3m12s  S
fe80::a236:9fff:fea4:dc2b%igb1       a0:36:9f:a4:dc:2b   igb1 permanent R
fd32:4e54:3b19::255:4e01             a0:36:9f:a4:dc:2b   igb1 permanent R
 
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