* @param addr IPv4 address.
* @param vrf_id VRF id of tenant, ~0 means independent of VRF.
* @param is_add 1 if add, 0 if delete.
*
* @returns 0 on success, non-zero value otherwise.
*/
* @param addr IPv4 address.
* @param vrf_id VRF id of tenant, ~0 means independent of VRF.
* @param is_add 1 if add, 0 if delete.
*
* @returns 0 on success, non-zero value otherwise.
*/