module ietf-ntp {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-ntp";
prefix "ntp";
import ietf-yang-types {
prefix "yang";
reference "RFC 6991";
}
import ietf-inet-types {
prefix "inet";
reference "RFC 6991";
}
import ietf-interfaces {
prefix "if";
reference "RFC 8343";
}
import iana-crypt-hash {
prefix "ianach";
reference "RFC 7317";
}
import ietf-key-chain {
prefix "key-chain";
reference "RFC 8177";
}
import ietf-access-control-list {
prefix "acl";
reference "RFC XXXX";
}
/* Note: The RFC Editor will replace XXXX with the number assigned
to the RFC once draft-ietf-netmod-acl-model becomes an RFC.*/
import ietf-routing-types {
prefix "rt-types";
reference "RFC 8294";
}
organization
"IETF NTP (Network Time Protocol) Working Group";
contact
"WG Web:
WG List:
Editor: Anil Kumar S N
Editor: Yi Zhao
Editor: Dhruv Dhody
Editor: Ankit Kumar Sinha
";
description
"This document defines a YANG data model for Network Time Protocol
(NTP) implementations. The data model includes configuration data
and state data.
Copyright (c) 2018 IETF Trust and the persons identified
as authors of the code. All rights reserved.
Redistribution and use in source and binary forms,
with or without modification, is permitted pursuant to,
and subject to the license terms contained in, the
Simplified BSD License set forth in Section 4.c of the
IETF Trust's Legal Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC YYYY;
see the RFC itself for full legal notices.";
revision 2018-12-17 {
description
"Updated revision.";
reference
"RFC YYYY: A YANG Data Model for NTP.";
}
/* Note: The RFC Editor will replace YYYY with the number assigned
to this document once it becomes an RFC.*/
/* Typedef Definitions */
typedef ntp-stratum {
type uint8 {
range "1..16";
}
description
"The level of each server in the hierarchy is defined by
a stratum. Primary servers are assigned with stratum
one; secondary servers at each lower level are assigned with
one stratum greater than the preceding level";
}
typedef ntp-version {
type uint8 {
range "1..4";
}
default "3";
description
"The current NTP version supported by corresponding
association.";
}
typedef ntp-minpoll {
type uint8 {
range "4..17";
}
default "6";
description
"The minimum poll exponent for this NTP association.";
}
typedef ntp-maxpoll {
type uint8 {
range "4..17";
}
default "10";
description
"The maximum poll exponent for this NTP association.";
}
typedef access-mode {
type enumeration {
enum peer {
value "0";
description
"Enables the full access authority. Both time
request and control query can be performed
on the local NTP service, and the local clock
can be synchronized with the remote server.";
}
enum server {
value "1";
description
"Enables the server access and query.
Both time requests and control query can be
performed on the local NTP service, but the
local clock cannot be synchronized with the
remote server.";
}
enum synchronization {
value "2";
description
"Enables the server to access.
Only time request can be performed on the
local NTP service.";
}
enum query {
value "3";
description
"Enables the maximum access limitation.
Control query can be performed only on the
local NTP service.";
}
}
description
"This defines NTP access modes.";
}
typedef unicast-configuration-type {
type enumeration {
enum server {
value "0";
description
"Use client association mode. This device
will not provide synchronization to the
configured NTP server.";
}
enum peer {
value "1";
description
"Use symmetric active association mode.
This device may provide synchronization
to the configured NTP server.";
}
}
description
"This defines NTP unicast mode of operation.";
}
typedef association-mode {
type enumeration {
enum client {
value "0";
description
"Use client association mode(mode 3).
This device will not provide synchronization
to the configured NTP server.";
}
enum active {
value "1";
description
"Use symmetric active association mode(mode 1).
This device may synchronize with its NTP peer,
or provide synchronization to configured NTP peer.";
}
enum passive {
value "2";
description
"Use symmetric passive association mode(mode 2).
This device has learned this association dynamically.
This device may synchronize with its NTP peer.";
}
enum broadcast {
value "3";
description
"Use broadcast mode(mode 5).
This mode defines that its either working
as broadcast-server or multicast-server.";
}
enum broadcast-client {
value "4";
description
"This mode defines that its either working
as broadcast-client or multicast-client.";
}
}
description
"The NTP association modes.";
}
typedef ntp-clock-status {
type enumeration {
enum synchronized {
value "0";
description
"Indicates that the local clock has been
synchronized with an NTP server or
the reference clock.";
}
enum unsynchronized {
value "1";
description
"Indicates that the local clock has not been
synchronized with any NTP server.";
}
}
description
"This defines NTP clock status.";
}
typedef ntp-sync-state {
type enumeration {
enum clock-not-set {
value "0";
description
"Indicates the clock is not updated.";
}
enum freq-set-by-cfg {
value "1";
description
"Indicates the clock frequency is set by
NTP configuration.";
}
enum clock-set {
value "2";
description
"Indicates the clock is set.";
}
enum freq-not-determined {
value "3";
description
"Indicates the clock is set but the frequency
is not determined.";
}
enum clock-synchronized {
value "4";
description
"Indicates that the clock is synchronized";
}
enum spike {
value "5";
description
"Indicates a time difference of more than 128
milliseconds is detected between NTP server
and client clock. The clock change will take
effect in XXX seconds.";
}
}
description
"This defines NTP clock sync states.";
}
/* features */
feature ntp-port {
description
"Support for NTP port configuration";
reference "RFC1305 - 3.2.7 Parameters";
}
feature authentication {
description
"Support for NTP symmetric key authentication";
reference "RFC1305 - 3.2.6 Authentication Variables";
}
feature access-rules {
description
"Support for NTP access control";
reference "RFC1305 - 3.6 Access Control Issues";
}
feature unicast-configuration {
description
"Support for NTP client/server or active/passive
in unicast";
reference "RFC1305 - 3.3 Modes of Operation";
}
feature broadcast-server {
description
"Support for broadcast server";
reference "RFC1305 - 3.3 Modes of Operation";
}
feature broadcast-client {
description
"Support for broadcast client";
reference "RFC1305 - 3.3 Modes of Operation";
}
feature multicast-server {
description
"Support for multicast server";
reference "RFC1305 - 3.3 Modes of Operation";
}
feature multicast-client {
description
"Support for multicast client";
reference "RFC1305 - 3.3 Modes of Operation";
}
feature manycast-server {
description
"Support for manycast server";
reference "RFC5905 - 3.1 Dynamic Server Discovery";
}
feature manycast-client {
description
"Support for manycast client";
reference "RFC5905 - 3.1 Dynamic Server Discovery";
}
/* Groupings */
grouping authentication-key {
description
"To define an authentication key for a Network Time
Protocol (NTP) time source.";
leaf key-id {
type uint32 {
range "1..max";
}
description
"Authentication key identifier.";
}
leaf algorithm {
type identityref {
base key-chain:crypto-algorithm;
}
description
"Authentication algorithm.";
}
leaf key {
type ianach:crypt-hash;
description
"The key";
}
leaf istrusted {
type boolean;
description
"Key-id is trusted or not";
}
}
grouping authentication {
description
"Authentication.";
choice authentication-type {
description
"Type of authentication.";
case symmetric-key {
leaf key-id {
type leafref {
path "/ntp:ntp/ntp:authentication/"
+ "ntp:authentication-keys/ntp:key-id";
}
description
"Authentication key id referenced in this
association.";
}
}
}
}
grouping statistics {
description
"NTP packet statistic.";
leaf packet-sent {
type yang:counter32;
description
"The total number of NTP packets delivered to the
transport service by this NTP entity for this
association.
Discountinuities in the value of this counter can occur
upon cold start or reinitialization of the NTP entity, the
management system and at other times as indicated by
discontinuities in the value of sysUpTime.";
}
leaf packet-sent-fail {
type yang:counter32;
description
"The number of times NTP packets sending failed.";
}
leaf packet-received {
type yang:counter32;
description
"The total number of NTP packets delivered to the
NTP entity from this association.
Discountinuities in the value of this counter can occur
upon cold start or reinitialization of the NTP entity, the
management system and at other times as indicated by
discontinuities in the value of sysUpTime.";
}
leaf packet-dropped {
type yang:counter32;
description
"The total number of NTP packets that were delivered
to this NTP entity from this association and this entity
was not able to process due to an NTP protocol error.
Discountinuities in the value of this counter can occur
upon cold start or reinitialization of the NTP entity, the
management system and at other times as indicated by
discontinuities in the value of sysUpTime.";
}
}
grouping common-attributes {
description
"NTP common attributes for configuration.";
leaf minpoll {
type ntp-minpoll;
description
"The minimum poll interval used in this association.";
}
leaf maxpoll {
type ntp-maxpoll;
description
"The maximum poll interval used in this association.";
}
leaf port {
if-feature ntp-port;
type inet:port-number {
range "123 | 1025..max";
}
default "123";
description
"Specify the port used to send NTP packets.";
}
leaf version {
type ntp-version;
description
"NTP version.";
}
}
grouping association-ref {
description
"Reference to NTP association mode";
leaf associations-address {
type leafref {
path "/ntp:ntp/ntp:associations/ntp:address";
}
description
"Indicates the association's address
which result in clock synchronization.";
}
leaf associations-local-mode {
type leafref {
path "/ntp:ntp/ntp:associations/ntp:local-mode";
}
description
"Indicates the association's local-mode
which result in clock synchronization.";
}
leaf associations-isconfigured {
type leafref {
path "/ntp:ntp/ntp:associations/"
+ "ntp:isconfigured";
}
description
"The association was configured or dynamic
which result in clock synchronization.";
}
}
/* Configuration data nodes */
container ntp {
presence
"NTP is enabled and system should attempt to
synchronize the system clock with an NTP server
from the 'ntp/associations' list.";
description
"Configuration parameters for NTP.";
leaf port {
if-feature ntp-port;
type inet:port-number {
range "123 | 1025..max";
}
default "123";
description
"Specify the port used to send and receive NTP packets.";
}
container refclock-master {
presence
"NTP master clock is enabled.";
description
"Configures the local clock of this device as NTP server.";
leaf master-stratum {
type ntp-stratum;
default "16";
description
"Stratum level from which NTP
clients get their time synchronized.";
}
}
container authentication {
description
"Configuration of authentication.";
leaf auth-enabled {
type boolean;
default false;
description
"Controls whether NTP authentication is enabled
or disabled on this device.";
}
list authentication-keys {
key "key-id";
uses authentication-key;
description
"List of authentication keys.";
}
}
container access-rules {
description
"Configuration to control access to NTP service
by using NTP access-group feature.
The access-mode identifies how the acl is
applied with NTP.";
list access-rule {
key "access-mode";
description
"List of access rules.";
leaf access-mode {
type access-mode;
description
"NTP access mode. The defination of each possible values:
peer(0): Both time request and control query can be
performed.
server(1): Enables the server access and query.
synchronization(2): Enables the server access only.
query(3): Enables control query only.";
}
leaf acl {
type leafref {
path "/acl:acls/acl:acl/acl:name";
}
description
"Control access configuration to be used.";
}
reference
"RFC 1305";
}
}
container clock-state {
config "false";
description
"Clock operational state of the NTP.";
container system-status {
description
"System status of NTP.";
leaf clock-state {
type ntp-clock-status;
mandatory true;
description
"The state of system clock. The definition of each
possible value is:
synchronized(0): Indicates local clock is synchronized.
unsynchronized(1): Indicates local clock is not
synchronized.";
}
leaf clock-stratum {
type ntp-stratum;
mandatory true;
description
"The NTP entity's own stratum value. Should be a stratum
of syspeer + 1 (or 16 if no syspeer).";
}
leaf clock-refid {
type union {
type inet:ipv4-address;
type binary {
length "4";
}
type string {
length "4";
}
}
mandatory true;
description
"IPv4 address or first 32 bits of the MD5 hash of
the IPv6 address or reference clock of the peer to
which clock is synchronized.";
}
uses association-ref {
description
"Reference to Association.";
}
leaf nominal-freq {
type decimal64 {
fraction-digits 4;
}
units Hz;
mandatory true;
description
"The nominal frequency of the
local clock.";
}
leaf actual-freq {
type decimal64 {
fraction-digits 4;
}
units Hz;
mandatory true;
description
"The actual frequency of the
local clock.";
}
leaf clock-precision {
type uint8;
units Hz;
mandatory true;
description
"Clock precision of this system in integer format
(prec=2^(-n)). A value of 5 would mean 2^-5 = 31.25 ms.";
}
leaf clock-offset {
type decimal64 {
fraction-digits 3;
}
units milliseconds;
description
"The time offset to the current selected reference time
source e.g., '0.032' or '1.232'.";
}
leaf root-delay {
type decimal64 {
fraction-digits 3;
}
units milliseconds;
description
"Total delay along the path to root clock.";
}
leaf root-dispersion {
type decimal64 {
fraction-digits 3;
}
units milliseconds;
description
"The dispersion between the local clock
and the root clock, e.g., '6.927'.";
}
leaf reference-time {
type yang:date-and-time;
description
"The reference timestamp.";
}
leaf sync-state {
type ntp-sync-state;
mandatory true;
description
"The synchronization status of
the local clock.";
}
}
}
list unicast-configuration {
key "address type";
description
"List of NTP unicast-configurations.";
leaf address {
type inet:host;
description
"Address of this association.";
}
leaf type {
type unicast-configuration-type;
description
"Use client association mode. This device
will not provide synchronization to the
configured NTP server.";
}
container authentication{
description
"Authentication used for this association.";
uses authentication;
}
leaf prefer {
type boolean;
default "false";
description
"Whether this association is preferred or not.";
}
leaf burst {
type boolean;
default "false";
description
"If set, a series of packets are sent instead of a single
packet within each synchronization interval to achieve faster
synchronization.";
}
leaf iburst {
type boolean;
default "false";
description
"If set, a series of packets are sent instead of a single
packet within the initial synchronization interval to achieve
faster initial synchronization.";
}
leaf source {
type if:interface-ref;
description
"The interface whose IP address is used by this association
as the source address.";
}
uses common-attributes {
description
"Common attributes like port, version, min and max
poll.";
}
}
list associations {
key "address local-mode isconfigured";
config "false";
description
"List of NTP associations. Here address, local-mode
and isconfigured is required to uniquely identify
a particular association. Lets take following examples -
1) If RT1 acting as broadcast server,
and RT2 acting as broadcast client, then RT2
will form dynamic association with address as RT1,
local-mode as client and isconfigured as false.
2) When RT2 is configured
with unicast-server RT1, then RT2 will form
association with address as RT1, local-mode as client
and isconfigured as true.
Thus all 3 leaves are needed as key to unique identify
the association.";
leaf address {
type inet:host;
description
"The address of this association. Represents the IP
address of a unicast/multicast/broadcast address.";
}
leaf local-mode {
type association-mode;
description
"Local mode of this NTP association.";
}
leaf isconfigured {
type boolean;
description
"Indicates if this association is configured or
dynamically learned.";
}
leaf stratum {
type ntp-stratum;
description
"The association stratum value.";
}
leaf refid {
type union {
type inet:ipv4-address;
type binary {
length "4";
}
type string {
length "4";
}
}
description
"The refclock driver ID, if available.
-- a refclock driver ID like '127.127.1.0' for local clock
sync
-- uni/multi/broadcast associations will look like '20.1.1.1'
-- sync with primary source will look like 'DCN', 'NIST',
'ATOM'";
reference
"RFC 1305";
}
leaf authentication{
type leafref {
path "/ntp:ntp/ntp:authentication/"
+ "ntp:authentication-keys/ntp:key-id";
}
description
"Authentication Key used for this association.";
}
leaf prefer {
type boolean;
default "false";
description
"Indicates if this association is preferred.";
}
leaf peer-interface {
type if:interface-ref;
description
"The interface which is used for communication.";
}
uses common-attributes {
description
"Common attributes like port, version, min and
max poll.";
}
leaf reach {
type uint8;
description
"The reachability of the configured
server or peer.";
}
leaf unreach {
type uint8;
description
"The unreachability of the configured
server or peer.";
}
leaf poll {
type uint8;
units seconds;
description
"The polling interval for current association";
}
leaf now {
type uint32;
units seconds;
description
"The time since the NTP packet was
not received or last synchronized.";
}
leaf offset {
type decimal64 {
fraction-digits 3;
}
units milliseconds;
description
"The offset between the local clock
and the peer clock, e.g., '0.032' or '1.232'";
}
leaf delay {
type decimal64 {
fraction-digits 3;
}
units milliseconds;
description
"The network delay between the local clock
and the peer clock.";
}
leaf dispersion {
type decimal64 {
fraction-digits 3;
}
units milliseconds;
description
"The root dispersion between the local clock
and the peer clock.";
}
leaf originate-time {
type yang:date-and-time;
description
"This is the local time, in timestamp format,
when latest NTP packet was sent to peer(T1).";
reference
"RFC 1305";
}
leaf receive-time {
type yang:date-and-time;
description
"This is the local time, in timestamp format,
when latest NTP packet arrived at peer(T2).
If the peer becomes unreachable the value is set to zero.";
reference
"RFC 1305";
}
leaf transmit-time {
type yang:date-and-time;
description
"This is the local time, in timestamp format,
at which the NTP packet departed the peer(T3).
If the peer becomes unreachable the value is set to zero.";
reference
"RFC 1305";
}
leaf input-time {
type yang:date-and-time;
description
"This is the local time, in timestamp format,
when the latest NTP message from the peer arrived(T4).
If the peer becomes unreachable the value is set to zero.";
reference
"RFC 1305";
}
container ntp-statistics {
description
"Per Peer packet send and receive statistics.";
uses statistics {
description
"NTP send and receive packet statistics.";
}
}
}
container interfaces {
description
"Configuration parameters for NTP interfaces.";
list interface {
key "name";
description
"List of interfaces.";
leaf name {
type if:interface-ref;
description
"The interface name.";
}
container broadcast-server {
presence
"NTP broadcast-server is configured";
description
"Configuration of broadcast server.";
leaf ttl {
type uint8;
description
"Specifies the time to live (TTL) for a
broadcast packet.";
}
container authentication{
description
"Authentication used for this association.";
uses authentication;
}
uses common-attributes {
description
"Common attribute like port, version, min and
max poll.";
}
}
container broadcast-client {
presence
"NTP broadcast-client is configured.";
description
"Configuration of broadcast-client.";
}
list multicast-server {
key "address";
description
"Configuration of multicast server.";
leaf address {
type rt-types:ip-multicast-group-address;
description
"The IP address to send NTP multicast packets.";
}
leaf ttl {
type uint8;
description
"Specifies the time to live (TTL) for a
multicast packet.";
}
container authentication{
description
"Authentication used for this association.";
uses authentication;
}
uses common-attributes {
description
"Common attributes like port, version, min and
max poll.";
}
}
list multicast-client {
key "address";
description
"Configuration of multicast-client.";
leaf address {
type rt-types:ip-multicast-group-address;
description
"The IP address of the multicast group to
join.";
}
}
list manycast-server {
key "address";
description
"Configuration of manycast server.";
leaf address {
type rt-types:ip-multicast-group-address;
description
"The multicast group IP address to receive
manycast client messages.";
}
reference
"RFC 5905";
}
list manycast-client {
key "address";
description
"Configuration of manycast-client.";
leaf address {
type rt-types:ip-multicast-group-address;
description
"The group IP address that the manycast client
broadcasts the request message to.";
}
container authentication{
description
"Authentication used for this association.";
uses authentication;
}
leaf ttl {
type uint8;
description
"Specifies the maximum time to live (TTL) for
the expanding ring search.";
}
leaf minclock {
type uint8;
description
"The minimum manycast survivors in this
association.";
}
leaf maxclock {
type uint8;
description
"The maximum manycast candidates in this
association.";
}
leaf beacon {
type uint8;
description
"The maximum interval between beacons in this
association.";
}
uses common-attributes {
description
"Common attributes like port, version, min and
max poll.";
}
reference
"RFC 5905";
}
}
}
container ntp-statistics {
config "false";
description
"Total NTP packet statistics.";
uses statistics {
description
"NTP send and receive packet statistics.";
}
}
}
}