**** CubicPower OpenStack Study ****
def reset_backend():
    global IMPL
    IMPL = utils.LazyPluggable('ipv6_backend',
               rfc2462='nova.ipv6.rfc2462',
               account_identifier='nova.ipv6.account_identifier')
**** CubicPower OpenStack Study ****
def to_global(prefix, mac, project_id):
    return IMPL.to_global(prefix, mac, project_id)
**** CubicPower OpenStack Study ****
def to_mac(ipv6_address):
    return IMPL.to_mac(ipv6_address)
reset_backend()