Before:
```
0:29 [0] devel1# ifconfig vlan5 inet6
vlan5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=680703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 2a02:6b8::1 prefixlen 63
inet6 fe80::5054:ff:fe52:3e90%vlan5 prefixlen 64 scopeid 0xd
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
0:29 [0] devel1# netstat -6rn | grep vlan5
2a02:6b8::/63 link#13 U vlan5
fe80::%vlan5/64 link#13 U vlan5
fe80::5054:ff:fe52:3e90%vlan5 link#2 UHS lo0
0:29 [0] devel1#
0:29 [0] devel1# ifconfig vlan5 inet6 fe80::1/64
0:29 [0] devel1# netstat -6rn | grep vlan5
2a02:6b8::/63 link#13 U vlan5
fe80::%vlan5/64 link#13 U vlan5
fe80::1%vlan5 link#2 UHS lo0
fe80::5054:ff:fe52:3e90%vlan5 link#2 UHS lo0
0:29 [0] devel1# ifconfig vlan5 inet6 fe80::1 delete
0:29 [0] devel1# netstat -6rn | grep vlan5
2a02:6b8::/63 link#13 U vlan5
fe80::5054:ff:fe52:3e90%vlan5 link#2 UHS lo0
0:29 [0] devel1#
```
After:
```
0:30 [1] m@devel0 netstat -6rn | grep vlan5
2a02:978::/64 link#5 U vlan5
fe80::%vlan5/64 link#5 U vlan5
fe80::5054:ff:fe42:fef%vlan5 link#5 UHS lo0
0:30 [1] m@devel0 s ifconfig vlan5 inet6 fe80::1/64
0:30 [1] m@devel0 netstat -6rn | grep vlan5
2a02:978::/64 link#5 U vlan5
fe80::%vlan5/64 link#5 U vlan5
fe80::1%vlan5 link#5 UHS lo0
fe80::5054:ff:fe42:fef%vlan5 link#5 UHS lo0
0:30 [1] m@devel0 s ifconfig vlan5 inet6 fe80::1 delete
0:30 [1] m@devel0 netstat -6rn | grep vlan5
2a02:978::/64 link#5 U vlan5
fe80::%vlan5/64 link#5 U vlan5
fe80::5054:ff:fe42:fef%vlan5 link#5 UHS lo0
```