IPv6 CARP

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A bge0 interface has IPv6 link-local address fec0::2e0:81ff:fe30:c9e0.
I have given it a site address of fec0::f:2e0:81ff:fe30:c9e0.

% cat /etc/hostname.bge0
up media 100baseTX mediaopt full-duplex
inet6 fec0::f:2e0:81ff:fe30:c9e0 64

How do I make a CARP interface that proceeds beyond state INIT?
At the moment, which remains in the INIT state:

% cat /etc/hostname.carp1
inet6 fec0::f:2e0:81ff:fe30:c9e0 64 vhid 2 pass password carpdev \
bge0

Thank you,
Darrel