'Return the default subnet pools available.'

def _get_supported_subnetpools(self, context):

    default_subnet_pools = [self.core_plugin.get_default_subnetpool(context, ver) for ver in (4, 6)]
    available_pools = [s for s in default_subnet_pools if s]
    if (not available_pools):
        LOG.error(_LE('No    default    pools    available'))
        raise n_exc.NotFound()
    return available_pools
