* sw_interface_add_del_functions[VNET_ITF_FUNC_N_PRIO];
_vnet_interface_function_list_elt_t
* sw_interface_admin_up_down_functions[VNET_ITF_FUNC_N_PRIO];
+ _vnet_interface_function_list_elt_t
+ * sw_interface_mtu_change_functions[VNET_ITF_FUNC_N_PRIO];
uword *interface_tag_by_sw_if_index;