Internet Engineering Task Force (IETF) X. Liu, Ed.
Request for Comments: 8347 A. Kyparlis
Category: Standards Track Jabil
ISSN: 2070-1721 R. Parikh
VMware
A. Lindem
Cisco Systems
M. Zhang
Huawei Technologies
March 2018
A YANG Data Model for the Virtual Router Redundancy Protocol (VRRP)
Abstract
This document describes a data model for the Virtual Router
Redundancy Protocol (VRRP). Both versions 2 and 3 of VRRP are
covered.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8347.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 ....................................................2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 2 ................................................2
1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 ..............................................3
1.3. Prefixes in Data Node Names . . . . . . . . . . . . . . . 3 ................................3
2. Design of the Data Model . . . . . . . . . . . . . . . . . . 3 ........................................3
2.1. Scope of the Model . . . . . . . . . . . . . . . . . . . 3 .........................................3
2.2. Relationships with the Interface Model and IP Model . . . 4 ........4
2.3. Protocol Configuration . . . . . . . . . . . . . . . . . 5 .....................................5
2.4. Protocol States . . . . . . . . . . . . . . . . . . . . . 6 ............................................6
2.5. Notifications . . . . . . . . . . . . . . . . . . . . . . 8 ..............................................9
3. Tree Structure . . . . . . . . . . . . . . . . . . . . . . . 9 .................................................10
4. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 12 ....................................................13
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 34 ............................................35
6. Security Considerations . . . . . . . . . . . . . . . . . . . 35 ........................................36
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 36 .....................................................37
7.1. Normative References . . . . . . . . . . . . . . . . . . 36 ......................................37
7.2. Informative References . . . . . . . . . . . . . . . . . 37 ....................................38
Appendix A. Data Tree Example . . . . . . . . . . . . . . . . . 38 .....................................40
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 41 ................................................45
1. Introduction
This document introduces a YANG data model [RFC6020] [RFC7950] for
the Virtual Router Redundancy Protocol (VRRP) [RFC3768] [RFC5798].
VRRP provides higher resiliency by specifying an election protocol
that dynamically assigns responsibility for a virtual router to one
of the VRRP routers on a LAN.
This
The YANG model module specified in this document supports both versions 2
and 3 of VRRP. VRRP version 2 (defined in [RFC3768]) supports IPv4.
VRRP version 3 (defined in [RFC5798]) supports both IPv4 and IPv6.
1.1. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
The following terms are defined in [RFC7950] and are not redefined
here:
o augment
o data model
o data node
1.2. Tree Diagrams
A simplified graphical representation of the data model is used in
this document. The meaning of the symbols in these diagrams is
defined in [RFC8340].
1.3. Prefixes in Data Node Names
In this document, names of data nodes, actions, and other data model
objects are often used without a prefix, as long as it is clear from
the context in which YANG module each name is defined. Otherwise,
names are prefixed using the standard prefix associated with the
corresponding YANG module, as shown in Table 1.
+--------+-----------------+-----------+
| Prefix | YANG module | Reference |
+--------+-----------------+-----------+
| yang | ietf-yang-types | [RFC6991] |
| inet | ietf-inet-types | [RFC6991] |
| if | ietf-interfaces | [RFC8343] |
| ip | ietf-ip | [RFC8344] |
+--------+-----------------+-----------+
Table 1: Prefixes and Corresponding YANG Modules
2. Design of the Data Model
2.1. Scope of the Model
The model covers VRRP version 2 [RFC3768] and VRRP version 3
[RFC5798]. The model is designed to be implemented on a device where
VRRP version 2 or 3 is implemented. With the help of a proper
management protocol, the defined model can be used to:
o Configure VRRP version 2 or 3.
o Manage the protocol operational behavior.
o Retrieve the protocol operational status.
o Receive the protocol notifications.
2.2. Relationships with the Interface Model and IP Model
This model augments the interface data model "ietf-interfaces"
[RFC8343] and the IP management model "ietf-ip" [RFC8344]. The
augmentation relationships are shown as follows:
module: ietf-interfaces
+--rw interfaces
+--rw interface* [name]
...
+--rw ip:ipv4!
| +--rw ip:address* [ip]
...
| +--rw vrrp:vrrp
| +--rw vrrp:vrrp-instance* [vrid]
| +--rw vrrp:vrid uint8
| +--rw vrrp:virtual-ipv4-addresses
...
+--rw ip:ipv6!
+--rw ip:address* [ip]
...
+--rw vrrp:vrrp
+--rw vrrp:vrrp-instance* [vrid]
+--rw vrrp:vrid uint8
+--rw vrrp:virtual-ipv6-addresses
...
In the above figure, a tree node without a prefix is from the model
"ietf-interfaces". A tree node with prefix "ip:" is from the model
"ietf-ip". A tree node with prefix "vrrp:" is from the VRRP model
specified in this document.
The "vrrp" container contains a list of vrrp-instance nodes, which
are instantiated under an interface for a specified address family
(IPv4 or IPv6).
Each vrrp-instance node represents a VRRP router state machine, as
described in Section 6.4 of [RFC5798], providing the configuration
and state information for the election process of a virtual router.
The IP addresses on the augmented interface are the real addresses
through which the VRRP router operates. The IPv4 or IPv6 address or
addresses associated with a virtual router (described in Section 1 of
[RFC5798]) are modeled as a list of IPv4 or IPv6 addresses under the
vrrp-instance.
2.3. Protocol Configuration
The model structure for the protocol configuration is as shown below:
augment /if:interfaces/if:interface/ip:ipv4:
+--rw vrrp
+--rw vrrp-instance* [vrid]
+--rw vrid uint8
| ...
+--rw track
| +--rw interfaces
| | +--rw interface* [interface]
| | +--rw interface if:interface-ref
| | ...
| +--rw networks
| +--rw network* [prefix]
| +--rw prefix inet:ipv4-prefix
| ...
+--rw virtual-ipv4-addresses
+--rw virtual-ipv4-address* [ipv4-address]
+--rw ipv4-address inet:ipv4-address
augment /if:interfaces/if:interface/ip:ipv6:
+--rw vrrp
+--rw vrrp-instance* [vrid]
+--rw vrid uint8
| ...
+--rw track
| +--rw interfaces
| | +--rw interface* [interface]
| | +--rw interface if:interface-ref
| | ...
| +--rw networks
| +--rw network* [prefix]
| +--rw prefix inet:ipv6-prefix
| ...
+--rw virtual-ipv6-addresses
+--rw virtual-ipv6-address* [ipv6-address]
+--rw ipv6-address inet:ipv6-address
The model allows the following protocol entities to be configured:
o VRRP instance (version 2 or 3), representing a VRRP router.
o Virtual IPv4 or IPv6 address associated with a virtual router.
o Tracking interface, to detect interface connectivity failures.
o Tracking network, to detect interface network connectivity failures.
2.4. Protocol States
The model structure for the protocol states is as shown below:
module: ietf-vrrp
+--ro vrrp
| // global operational states
+--ro virtual-routers? uint32
+--ro interfaces? uint32
+--ro statistics // global statistics
+--ro discontinuity-datetime? yang:date-and-time
+--ro checksum-errors? yang:counter64
+--ro version-errors? yang:counter64
+--ro vrid-errors? yang:counter64
+--ro ip-ttl-errors? yang:counter64
augment /if:interfaces/if:interface/ip:ipv4:
+--rw vrrp
+--rw vrrp-instance* [vrid]
+--rw vrid uint8
| ...
+--rw track
| +--rw interfaces
| | +--rw interface* [interface]
| | +--rw interface if:interface-ref
| | ...
| +--rw networks
| +--rw network* [prefix]
| +--rw prefix inet:ipv4-prefix
| ...
+--rw virtual-ipv4-addresses
| +--rw virtual-ipv4-address* [ipv4-address]
| +--rw ipv4-address inet:ipv4-address
|
| // per instance per-instance operational states
+--ro state? identityref
+--ro is-owner? boolean
+--ro last-adv-source? inet:ip-address
+--ro up-datetime? yang:date-and-time
+--ro master-down-interval? uint32
+--ro skew-time? uint32
+--ro last-event? identityref
+--ro new-master-reason? new-master-reason-type
+--ro statistics // per instance per-instance statistics
+--ro discontinuity-datetime? yang:date-and-time
+--ro master-transitions? yang:counter32
+--ro advertisement-recv? advertisement-rcvd? yang:counter64
+--ro advertisement-sent? yang:counter64
+--ro interval-errors? yang:counter64
| {validate-interval-errors}?
+--ro priority-zero-pkts-rcvd? yang:counter64
+--ro priority-zero-pkts-sent? yang:counter64
+--ro invalid-type-pkts-rcvd? yang:counter64
+--ro address-list-errors? yang:counter64
| {validate-address-list-errors}?
+--ro packet-length-errors? yang:counter64
augment /if:interfaces/if:interface/ip:ipv6:
+--rw vrrp
+--rw vrrp-instance* [vrid]
+--rw vrid uint8
+ ...
+--rw track
| +--rw interfaces
| | +--rw interface* [interface]
| | +--rw interface if:interface-ref
| | ...
| +--rw networks
| +--rw network* [prefix]
| +--rw prefix inet:ipv6-prefix
| ...
+--rw virtual-ipv6-addresses
| +--rw virtual-ipv6-address* [ipv6-address]
| +--rw ipv6-address inet:ipv6-address
|
| // per instance per-instance operational states
+--ro state? identityref
+--ro is-owner? boolean
+--ro last-adv-source? inet:ip-address
+--ro up-datetime? yang:date-and-time
+--ro master-down-interval? uint32
+--ro skew-time? uint32
+--ro last-event? identityref
+--ro new-master-reason? new-master-reason-type
+--ro statistics // per instance per-instance statistics
+--ro discontinuity-datetime? yang:date-and-time
+--ro master-transitions? yang:counter32
+--ro advertisement-recv? advertisement-rcvd? yang:counter64
+--ro advertisement-sent? yang:counter64
+--ro interval-errors? yang:counter64
| {validate-interval-errors}?
+--ro priority-zero-pkts-rcvd? yang:counter64
+--ro priority-zero-pkts-sent? yang:counter64
+--ro invalid-type-pkts-rcvd? yang:counter64
+--ro address-list-errors? yang:counter64
| {validate-address-list-errors}?
+--ro packet-length-errors? yang:counter64
This model conforms to the Network Management Datastore Architecture
(NMDA) [RFC8342]. The operational state data is combined with the
associated configuration data in the same hierarchy
[YANG-Guidelines]. When protocol states are retrieved from the NMDA
operational state datastore, the returned states cover all
"config true" (rw) and "config false" (ro) nodes defined in the
schema.
The model allows the retrieval of protocol states at the following
levels:
o VRRP instance (version 2 or 3), representing a VRRP router.
o Virtual IPv4 or IPv6 address associated with a virtual router.
o Tracking interface, to detect interface connectivity failures.
o Tracking network, to detect interface network connectivity failures.
o Global states and statistics summarizing all instances.
2.5. Notifications
This model defines the following VRRP-specific notifications:
notifications:
+---n vrrp-new-master-event
| +--ro master-ip-address inet:ip-address
| +--ro new-master-reason new-master-reason-type
+---n vrrp-protocol-error-event
| +--ro protocol-error-reason identityref
+---n vrrp-virtual-router-error-event
+--ro interface if:interface-ref
+--ro (ip-version)
| +--:(ipv4)
| | +--ro ipv4
| | +--ro vrid leafref
| +--:(ipv6)
| +--ro ipv6
| +--ro vrid leafref
+--ro virtual-router-error-reason identityref
Each notification type is used to indicate a type of VRRP state
change or error occurrence:
vrrp-new-master-event
VRRP new master event, indicating that a new master has been
elected.
vrrp-protocol-error-event
VRRP protocol error event for a message that fails to reach a VRRP
instance to be processed.
vrrp-virtual-router-error-event
VRRP virtual router error event for a message processed on a VRRP
instance.
In addition to the notifications specified above, the mechanisms
defined in [Subscribed-Notifications] and [YANG-Push] can be used for
other general notifications. These mechanisms currently allow the
user to:
o Subscribe notifications on a per-client basis.
o Specify subtree filters or XML Path Language (XPath) filters so
that only contents of interest will be sent.
o Specify either periodic or on-demand notifications.
3. Tree Structure
The VRRP YANG data model defined in this document has the following
tree structure:
module: ietf-vrrp
+--ro vrrp
+--ro virtual-routers? uint32
+--ro interfaces? uint32
+--ro statistics
+--ro discontinuity-datetime? yang:date-and-time
+--ro checksum-errors? yang:counter64
+--ro version-errors? yang:counter64
+--ro vrid-errors? yang:counter64
+--ro ip-ttl-errors? yang:counter64
augment /if:interfaces/if:interface/ip:ipv4:
+--rw vrrp
+--rw vrrp-instance* [vrid]
+--rw vrid uint8
+--rw version identityref
+--rw log-state-change? boolean
+--rw preempt
| +--rw enabled? boolean
| +--rw hold-time? uint16
+--rw priority? uint8
+--rw accept-mode? boolean
+--rw (advertise-interval-choice)?
| +--:(v2)
| | +--rw advertise-interval-sec? uint8
| +--:(v3)
| +--rw advertise-interval-centi-sec? uint16
+--rw track
| +--rw interfaces
| | +--rw interface* [interface]
| | +--rw interface if:interface-ref
| | +--rw priority-decrement? uint8
| +--rw networks
| +--rw network* [prefix]
| +--rw prefix inet:ipv4-prefix
| +--rw priority-decrement? uint8
+--rw virtual-ipv4-addresses
| +--rw virtual-ipv4-address* [ipv4-address]
| +--rw ipv4-address inet:ipv4-address
+--ro state? identityref
+--ro is-owner? boolean
+--ro last-adv-source? inet:ip-address
+--ro up-datetime? yang:date-and-time
+--ro master-down-interval? uint32
+--ro skew-time? uint32
+--ro last-event? identityref
+--ro new-master-reason?
new-master-reason-type
+--ro statistics
+--ro discontinuity-datetime? yang:date-and-time
+--ro master-transitions? yang:counter32
+--ro advertisement-recv? advertisement-rcvd? yang:counter64
+--ro advertisement-sent? yang:counter64
+--ro interval-errors? yang:counter64
| {validate-interval-errors}?
+--ro priority-zero-pkts-rcvd? yang:counter64
+--ro priority-zero-pkts-sent? yang:counter64
+--ro invalid-type-pkts-rcvd? yang:counter64
+--ro address-list-errors? yang:counter64
| {validate-address-list-errors}?
+--ro packet-length-errors? yang:counter64
augment /if:interfaces/if:interface/ip:ipv6:
+--rw vrrp
+--rw vrrp-instance* [vrid]
+--rw vrid uint8
+--rw version identityref
+--rw log-state-change? boolean
+--rw preempt
| +--rw enabled? boolean
| +--rw hold-time? uint16
+--rw priority? uint8
+--rw accept-mode? boolean
+--rw advertise-interval-centi-sec? uint16
+--rw track
| +--rw interfaces
| | +--rw interface* [interface]
| | +--rw interface if:interface-ref
| | +--rw priority-decrement? uint8
| +--rw networks
| +--rw network* [prefix]
| +--rw prefix inet:ipv6-prefix
| +--rw priority-decrement? uint8
+--rw virtual-ipv6-addresses
| +--rw virtual-ipv6-address* [ipv6-address]
| +--rw ipv6-address inet:ipv6-address
+--ro state? identityref
+--ro is-owner? boolean
+--ro last-adv-source? inet:ip-address
+--ro up-datetime? yang:date-and-time
+--ro master-down-interval? uint32
+--ro skew-time? uint32
+--ro last-event? identityref
+--ro new-master-reason?
new-master-reason-type
+--ro statistics
+--ro discontinuity-datetime? yang:date-and-time
+--ro master-transitions? yang:counter32
+--ro advertisement-recv? advertisement-rcvd? yang:counter64
+--ro advertisement-sent? yang:counter64
+--ro interval-errors? yang:counter64
| {validate-interval-errors}?
+--ro priority-zero-pkts-rcvd? yang:counter64
+--ro priority-zero-pkts-sent? yang:counter64
+--ro invalid-type-pkts-rcvd? yang:counter64
+--ro address-list-errors? yang:counter64
| {validate-address-list-errors}?
+--ro packet-length-errors? yang:counter64
notifications:
+---n vrrp-new-master-event
| +--ro master-ip-address inet:ip-address
| +--ro new-master-reason new-master-reason-type
+---n vrrp-protocol-error-event
| +--ro protocol-error-reason identityref
+---n vrrp-virtual-router-error-event
+--ro interface if:interface-ref
+--ro (ip-version)
| +--:(ipv4)
| | +--ro ipv4
| | +--ro vrid leafref
| +--:(ipv6)
| +--ro ipv6
| +--ro vrid leafref
+--ro virtual-router-error-reason identityref
4. YANG Module
This module references [RFC2787], [RFC3768], [RFC5798], and
[RFC6527].
<CODE BEGINS> file "ietf-vrrp@2018-03-13.yang"
module ietf-vrrp {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-vrrp";
prefix "vrrp";
import ietf-inet-types {
prefix "inet";
}
import ietf-yang-types {
prefix "yang";
}
import ietf-interfaces {
prefix "if";
}
import ietf-ip {
prefix "ip";
}
organization
"IETF Routing Area Working Group (RTGWG)";
contact
"WG Web: <https://datatracker.ietf.org/wg/rtgwg/>
WG List: <mailto:rtgwg@ietf.org>
Editor: Xufeng Liu
<mailto:Xufeng_Liu@jabil.com>
<mailto:xufeng.liu.ietf@gmail.com>
Editor: Athanasios Kyparlis
<mailto:Athanasios_Kyparlis@jabil.com>
Editor: Ravi Parikh
<mailto:parikhr@vmware.com>
Editor: Acee Lindem
<mailto:acee@cisco.com>
Editor: Mingui Zhang
<mailto:zhangmingui@huawei.com>";
description
"This YANG module defines a model for managing Virtual Router
Redundancy Protocol (VRRP) versions 2 and 3.
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
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC 8347; see the
RFC itself for full legal notices.";
revision 2018-03-13 {
description
"Initial revision.";
reference
"RFC 8347: A YANG Data Model for the Virtual Router Redundancy
Protocol (VRRP)
RFC 2787: Definitions of Managed Objects for the Virtual
Router Redundancy Protocol
RFC 3768: Virtual Router Redundancy Protocol (VRRP)
RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6
RFC 6527: Definitions of Managed Objects for the Virtual
Router Redundancy Protocol Version 3 (VRRPv3)";
}
/*
* Features
*/
feature validate-interval-errors {
description
"This feature indicates that the system validates that the
advertisement interval from advertisement packets received
is the same as the interval configured for the local
VRRP router.";
}
feature validate-address-list-errors {
description
"This feature indicates that the system validates that
the address list from received packets matches the
locally configured list for the VRRP router.";
}
/*
* Typedefs
*/
typedef new-master-reason-type {
type enumeration {
enum not-master {
description
"The virtual router has never transitioned to master
state.";
}
enum priority {
description
"Priority was higher.";
}
enum preempted {
description
"The master was preempted.";
}
enum no-response {
description
"Previous master did not respond.";
}
}
description
"Indicates the reason for why the virtual router to transition has transitioned to
master state.";
} // new-master-reason-type
/*
* Identities
*/
/* vrrp-event-type identity and its derivatives. */
identity vrrp-event-type {
description
"Indicates the type of a VRRP protocol event.";
}
identity vrrp-event-none {
base vrrp-event-type;
description
"Indicates a non-meaningful event.";
}
identity vrrp-event-startup {
base vrrp-event-type;
description
"Indicates that a VRRP router has initiated the protocol.";
}
identity vrrp-event-shutdown {
base vrrp-event-type;
description
"Indicates that a VRRP router has closed down the protocol.";
}
identity vrrp-event-higher-priority-backup {
base vrrp-event-type;
description
"Indicates that a backup router has a higher priority than
the current master.";
}
identity vrrp-event-master-timeout {
base vrrp-event-type;
description
"Indicates that the current master has not sent an
advertisement within the limit of master-down-interval.";
}
identity vrrp-event-interface-up {
base vrrp-event-type;
description
"Indicates that the VRRP-enabled interface has become
'operational up'.";
}
identity vrrp-event-interface-down {
base vrrp-event-type;
description
"Indicates that the VRRP-enabled interface has become
'operational down'.";
}
identity vrrp-event-no-primary-ip-address {
base vrrp-event-type;
description
"Indicates that the primary IP address on the VRRP-enabled
interface has become unavailable.";
}
identity vrrp-event-primary-ip-address {
base vrrp-event-type;
description
"Indicates that the primary IP address on the VRRP-enabled
interface has become available.";
}
identity vrrp-event-no-virtual-ip-addresses {
base vrrp-event-type;
description
"Indicates that there are no virtual IP addresses on the
virtual router.";
}
identity vrrp-event-virtual-ip-addresses {
base vrrp-event-type;
description
"Indicates that there are virtual IP addresses on the
virtual router.";
}
identity vrrp-event-preempt-hold-timeout {
base vrrp-event-type;
description
"Indicates that the configured preemption hold time has
passed.";
}
identity vrrp-event-lower-priority-master {
base vrrp-event-type;
description
"Indicates that there is a lower-priority VRRP master.";
}
identity vrrp-event-owner-preempt {
base vrrp-event-type;
description
"Indicates that the owner has preempted another router to
become the master.";
}
/* vrrp-error-global identity and its derivatives. */
identity vrrp-error-global {
description
"Indicates the type of a VRRP error that occurs occurred
for a packet before it reaches a VRRP router.";
}
identity checksum-error {
base vrrp-error-global;
description
"A packet has been received with an invalid VRRP checksum
value.";
}
identity ip-ttl-error {
base vrrp-error-global;
description
"A packet has been received with IP TTL (Time-To-Live)
not equal to 255.";
}
identity version-error {
base vrrp-error-global;
description
"A packet has been received with an unknown or unsupported
version number.";
}
identity vrid-error {
base vrrp-error-global;
description
"A packet has been received with a Virtual Router Identifier
(VRID) that is not valid for any virtual router on this
router.";
}
/* vrrp-error-virtual-router identity and its derivatives. */
identity vrrp-error-virtual-router {
description
"Indicates the type of a VRRP error that occurs occurred
after a packet reaches a VRRP router.";
}
identity address-list-error {
base vrrp-error-virtual-router;
description
"A packet has been received with an address list that
does not match the locally configured address list for
the virtual router.";
}
identity interval-error {
base vrrp-error-virtual-router;
description
"A packet has been received with an advertisement interval
different than the interval configured for the local
virtual router.";
}
identity packet-length-error {
base vrrp-error-virtual-router;
description
"A packet has been received with a packet length less
than the length of the VRRP header.";
}
/* vrrp-state-type identity and its derivatives. */
identity vrrp-state-type {
description
"Indicates the state of a virtual router.";
}
identity initialize {
base vrrp-state-type;
description
"Indicates that the virtual router is waiting
for a startup event.";
}
identity backup {
base vrrp-state-type;
description
"Indicates that the virtual router is monitoring the
availability of the master router.";
}
identity master {
base vrrp-state-type;
description
"Indicates that the virtual router is forwarding
packets for IP addresses that are associated with
this virtual router.";
}
/* vrrp-version identity and its derivatives. */
identity vrrp-version {
description
"The version of VRRP.";
}
identity vrrp-v2 {
base vrrp-version;
description
"Indicates version 2 of VRRP.";
}
identity vrrp-v3 {
base vrrp-version;
description
"Indicates version 3 of VRRP.";
}
/*
* Groupings
*/
grouping vrrp-common-attributes {
description
"Group of VRRP attributes common to versions 2 and 3.";
leaf vrid {
type uint8 {
range "1..255";
}
description
"Virtual Router ID (i.e., VRID).";
}
leaf version {
type identityref {
base vrrp:vrrp-version;
}
mandatory true;
description
"Version 2 or 3 of VRRP.";
}
leaf log-state-change {
type boolean;
default "false";
description
"Generates VRRP state change messages each time the
VRRP instance changes state (from 'up' to 'down'
or 'down' to 'up').";
}
container preempt {
description
"Enables a higher-priority VRRP backup router to preempt a
lower-priority VRRP master.";
leaf enabled {
type boolean;
default "true";
description
"'true' if preemption is enabled.";
}
leaf hold-time {
type uint16;
units seconds;
default 0;
description
"Hold time, in seconds, for which a higher-priority VRRP
backup router must wait before preempting a lower-priority
VRRP master.";
}
}
leaf priority {
type uint8 {
range "1..254";
}
default 100;
description
"Configures the VRRP election priority for the backup
virtual router.";
}
leaf accept-mode {
when "derived-from-or-self(current()/../version, 'vrrp-v3')" {
description
"Applicable only to version 3.";
}
type boolean;
default "false";
description
"Controls whether a virtual router in master state will
accept packets addressed to the address owner's IPvX address
as its own if it is not the IPvX address owner. The default
is 'false'. Deployments that rely on, for example, pinging
the address owner's IPvX address may wish to configure
accept-mode to 'true'.
Note: IPv6 Neighbor Solicitations and Neighbor
Advertisements MUST NOT be dropped when accept-mode
is 'false'.";
}
} // vrrp-common-attributes
grouping vrrp-ipv4-attributes {
description
"Group of VRRP attributes for IPv4.";
uses vrrp-common-attributes;
choice advertise-interval-choice {
description
"The options for the advertisement interval at which VRRPv2
or VRRPv3 advertisements are sent from the specified
interface.";
case v2 {
when "derived-from-or-self(version, 'vrrp-v2')" {
description
"Applicable only to version 2.";
}
leaf advertise-interval-sec {
type uint8 {
range "1..254";
}
units seconds;
default 1;
description
"Configures the interval that VRRPv2 advertisements
are sent from the specified interface.";
}
}
case v3 {
when "derived-from-or-self(version, 'vrrp-v3')" {
description
"Applicable only to version 3.";
}
leaf advertise-interval-centi-sec {
type uint16 {
range "1..4095";
}
units centiseconds;
default 100;
description
"Configures the interval that VRRPv3 advertisements
are sent from the specified interface.";
}
}
} // advertise-interval-choice
container track {
description
"Enables the specified VRRP instance to track interfaces
or networks.";
container interfaces {
description
"Enables the specified VRRPv2 or VRRPv3 instance to track
interfaces. Interface tracking prevents traffic loss by
detecting the availability of interfaces. The operational
states of other interfaces are associated with the
priority of a VRRP router. When a tracked interface
becomes unavailable (or 'operational down'), the priority
of the backup VRRP router decrements. When an unavailable
interface becomes available again, the priority of the
backup
VRRP router is incremented by the same amount.";
list interface {
key "interface";
description
"Interface to track.";
leaf interface {
type if:interface-ref;
must "/if:interfaces/if:interface[if:name=current()]/"
+ "ip:ipv4" {
description
"Interface is IPv4.";
}
description
"Interface to track.";
}
leaf priority-decrement {
type uint8 {
range "1..254";
}
default 10;
description
"Specifies how much to decrement the priority of the
VRRP instance if the interface goes down.";
}
} // interface
} // interfaces
container networks {
description
"Enables the backup VRRPv2 or VRRPv3 router instance to track the
specified networks through the IP their IPv4 network prefixes of
these networks. prefixes.
Network tracking prevents traffic loss by detecting
network connectivity failure. The states of
connectivity to some networks are associated with the
priority of a VRRP router. When connectivity to a
tracked network represented by its prefix is lost, the
priority of the backup VRRP router decrements. When an
unavailable network is again reachable, the priority of
the backup VRRP router is incremented by the same amount.";
list network {
key "prefix";
description
"Enables the specified VRRPv2 or VRRPv3 instance to
track an IP IPv4 network by specifying the prefix of the
IP
IPv4 network.";
leaf prefix {
type inet:ipv4-prefix;
description
"The IPv4 prefix of the network to track.";
}
leaf priority-decrement {
type uint8 {
range "1..254";
}
default 10;
description
"Specifies how much to decrement the priority of the
backup
VRRP router if there is a failure in the IP IPv4
network.";
}
} // track-network network
} // track-networks networks
} // track
container virtual-ipv4-addresses {
description
"Configures the virtual IP IPv4 address for the
VRRP interface.";
list virtual-ipv4-address {
key "ipv4-address";
max-elements 16;
description
"Virtual IP IPv4 addresses for a single VRRP instance. For a
VRRP owner router, the virtual address must match one
of the IP IPv4 addresses configured on the interface
corresponding to the virtual router.";
leaf ipv4-address {
type inet:ipv4-address;
description
"An IPv4 address associated with a virtual router.";
reference
"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6. Section 1.2";
}
} // virtual-ipv4-address
} // virtual-ipv4-addresses
} // grouping vrrp-ipv4-attributes
grouping vrrp-ipv6-attributes {
description
"Group of VRRP attributes for IPv6.";
uses vrrp-common-attributes;
leaf advertise-interval-centi-sec {
type uint16 {
range "1..4095";
}
units centiseconds;
default 100;
description
"Configures the interval that VRRPv3 advertisements
are sent from the specified interface.";
}
container track {
description
"Enables the specified VRRP instance to track interfaces
or networks.";
container interfaces {
description
"Enables the specified VRRPv2 or VRRPv3 instance to track
interfaces. Interface tracking prevents traffic loss by
detecting the availability of interfaces. The operational
states of other interfaces are associated with the
priority of a VRRP router. When a tracked interface
becomes unavailable (or 'operational down'), the priority
of the backup VRRP router decrements. When an unavailable
interface becomes available again, the priority of the
backup
VRRP router is incremented by the same amount.";
list interface {
key "interface";
description
"Interface to track.";
leaf interface {
type if:interface-ref;
must "/if:interfaces/if:interface[if:name=current()]/"
+ "ip:ipv6" {
description
"Interface is IPv6.";
}
description
"Interface to track.";
}
leaf priority-decrement {
type uint8 {
range "1..254";
}
default 10;
description
"Specifies how much to decrement the priority of the
VRRP instance if the interface goes down.";
}
} // interface
} // interfaces
container networks {
description
"Enables the backup VRRPv2 or VRRPv3 router instance to track the
specified networks through the IP their IPv6 network prefixes of
these networks. prefixes.
Network tracking prevents traffic loss by detecting
network connectivity failure. The states of
connectivity to some networks are associated with the
priority of a VRRP router. When connectivity to a
tracked network represented by its prefix is lost, the
priority of the backup VRRP router decrements. When an
unavailable network is again reachable, the priority of
the backup VRRP router is incremented by the same amount.";
list network {
key "prefix";
description
"Enables the specified VRRPv2 or VRRPv3 instance to
track an IP IPv6 network by specifying the prefix of the
IP
IPv6 network.";
leaf prefix {
type inet:ipv6-prefix;
description
"The IPv6 prefix of the network to track.";
}
leaf priority-decrement {
type uint8 {
range "1..254";
}
default 10;
description
"Specifies how much to decrement the priority of the
backup
VRRP router if there is a failure in the IP IPv6
network.";
}
} // track-network network
} // track-networks networks
} // track
container virtual-ipv6-addresses {
description
"Configures the virtual IP IPv6 address for the
VRRP interface.";
list virtual-ipv6-address {
key "ipv6-address";
max-elements 2;
description
"Two IPv6 addresses are allowed. The first address must
be a link-local address. The second address can be a
link-local or global address.";
leaf ipv6-address {
type inet:ipv6-address;
description
"An IPv6 address associated with a virtual router.";
reference
"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6. Section 1.3";
}
} // virtual-ipv6-address
} // virtual-ipv6-addresses
} // grouping vrrp-ipv6-attributes
grouping vrrp-state-attributes {
description
"Group of VRRP state attributes.";
leaf state {
type identityref {
base vrrp:vrrp-state-type;
}
config false;
description
"Operational state.";
}
leaf is-owner {
type boolean;
config false;
description
"Set to 'true' if this virtual router is the owner.";
}
leaf last-adv-source {
type inet:ip-address;
config false;
description
"Last advertised IPv4/IPv6 source address.";
}
leaf up-datetime {
type yang:date-and-time;
config false;
description
"The date and time when this virtual router
transitioned out of 'init' state.";
}
leaf master-down-interval {
type uint32;
units centiseconds;
config false;
description
"Time interval for the backup virtual router to declare
'master down'.";
}
leaf skew-time {
type uint32;
units microseconds;
config false;
description
"Calculated based on the priority and advertisement
interval configuration command parameters. See RFC 3768.";
}
leaf last-event {
type identityref {
base vrrp:vrrp-event-type;
}
config false;
description
"Last reported event.";
}
leaf new-master-reason {
type new-master-reason-type;
config false;
description
"Indicates the reason for why the virtual router to transition has transitioned to
master state.";
}
container statistics {
config false;
description
"VRRP statistics.";
leaf discontinuity-datetime {
type yang:date-and-time;
description
"The time on the most recent occasion at which any one or
more of the VRRP statistics counters suffered a
discontinuity. If no such discontinuities have occurred
since the last re-initialization of the local management
subsystem, then this node contains the time that the
local management subsystem re-initialized itself.";
}
leaf master-transitions {
type yang:counter32;
description
"The total number of times that this virtual router's
state has transitioned to 'master'.";
}
leaf advertisement-recv advertisement-rcvd {
type yang:counter64;
description
"The total number of VRRP advertisements received by
this virtual router.";
}
leaf advertisement-sent {
type yang:counter64;
description
"The total number of VRRP advertisements sent by
this virtual router.";
}
leaf interval-errors {
if-feature validate-interval-errors;
type yang:counter64;
description
"The total number of VRRP advertisement packets received
with an advertisement interval different than the
interval configured for the local virtual router.";
}
leaf priority-zero-pkts-rcvd {
type yang:counter64;
description
"The total number of VRRP packets received by the
virtual router with a priority of 0.";
}
leaf priority-zero-pkts-sent {
type yang:counter64;
description
"The total number of VRRP packets sent by the
virtual router with a priority of 0.";
}
leaf invalid-type-pkts-rcvd {
type yang:counter64;
description
"The number of VRRP packets received by the virtual
router with an invalid value in the 'type' field.";
}
leaf address-list-errors {
if-feature validate-address-list-errors;
type yang:counter64;
description
"The total number of packets received with an
address list that does not match the locally
configured address list for the virtual router.";
}
leaf packet-length-errors {
type yang:counter64;
description
"The total number of packets received with a packet
length less than the length of the VRRP header.";
}
} // container statistics
} // grouping vrrp-state-attributes
grouping vrrp-global-state-attributes {
description
"Group of VRRP global state attributes.";
leaf virtual-routers {
type uint32;
description
"Number of configured virtual routers.";
}
leaf interfaces {
type uint32;
description
"Number of interfaces with VRRP configured.";
}
container statistics {
description
"VRRP global statistics.";
leaf discontinuity-datetime {
type yang:date-and-time;
description
"The time on the most recent occasion at which any
one or more of checksum-errors, version-errors,
vrid-errors, or ip-ttl-errors suffered a
discontinuity.
If no such discontinuities have occurred since the last
re-initialization of the local management subsystem,
then this node contains the time that the local management
subsystem re-initialized itself.";
}
leaf checksum-errors {
type yang:counter64;
description
"The total number of VRRP packets received with an invalid
VRRP checksum value.";
reference
"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6. Section 5.2.8";
}
leaf version-errors {
type yang:counter64;
description
"The total number of VRRP packets received with an unknown
or unsupported version number.";
reference
"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6. Section 5.2.1";
}
leaf vrid-errors {
type yang:counter64;
description
"The total number of VRRP packets received with a VRID that
is not valid for any virtual router on this router.";
reference
"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6. Section 5.2.3";
}
leaf ip-ttl-errors {
type yang:counter64;
description
"The total number of VRRP packets received by the
virtual router with IP TTL (IPv4) or hop limit Hop Limit (IPv6)
not equal to 255.";
reference
"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6.
Sections 5.1.1.3 and 5.1.2.3";
}
} // statistics
} // vrrp-global-state-attributes
/*
* Configuration data and operational state data nodes
*/
augment "/if:interfaces/if:interface/ip:ipv4" {
description
"Augment
"Augments IPv4 interface.";
container vrrp {
description
"Configures VRRP version 2 or 3 for IPv4.";
list vrrp-instance {
key "vrid";
description
"Defines a virtual router, identified by a VRID, within the
IPv4 address space.";
uses vrrp-ipv4-attributes;
uses vrrp-state-attributes;
}
}
} // augment augments ipv4
augment "/if:interfaces/if:interface/ip:ipv6" {
description
"Augment
"Augments IPv6 interface.";
container vrrp {
description
"Configures VRRP version 3 for IPv6.";
list vrrp-instance {
must "derived-from-or-self(version, 'vrrp-v3')" {
description
"IPv6 is only supported by version 3.";
}
key "vrid";
description
"Defines a virtual router, identified by a VRID, within the
IPv6 address space.";
uses vrrp-ipv6-attributes;
uses vrrp-state-attributes;
} // list vrrp-instance
} // container vrrp
} // augment augments ipv6
container vrrp {
config false;
description
"VRRP data at the global level.";
uses vrrp-global-state-attributes;
}
/*
* Notifications
*/
notification vrrp-new-master-event {
description
"Notification event for a change the election of VRRP a new VRRP master.";
leaf master-ip-address {
type inet:ip-address;
mandatory true;
description
"IPv4 or IPv6 address of the new master.";
}
leaf new-master-reason {
type new-master-reason-type;
mandatory true;
description
"Indicates the reason for why the virtual router to transition has transitioned to
master state.";
}
}
notification vrrp-protocol-error-event {
description
"Notification event for a VRRP protocol error.";
leaf protocol-error-reason {
type identityref {
base vrrp:vrrp-error-global;
}
mandatory true;
description
"Indicates the reason for the protocol error.";
}
}
notification vrrp-virtual-router-error-event {
description
"Notification event for an error that happened on a
virtual router.";
leaf interface {
type if:interface-ref;
mandatory true;
description
"Indicates the interface for on which statistics area
to be cleared."; the event has occurred.";
}
choice ip-version {
mandatory true;
description
"The error may have happened on either an IPv4 virtual
router or an IPv6 virtual router. The information
related to a specific IP version is provided by one of
the following cases.";
case ipv4 {
description
"IPv4.";
container ipv4 {
description
"Error information for IPv4.";
leaf vrid {
type leafref {
path "/if:interfaces/if:interface"
+ "[if:name = current()/../../vrrp:interface]/"
+ "ip:ipv4/vrrp:vrrp/vrrp:vrrp-instance/vrrp:vrid";
}
mandatory true;
description
"Indicates the virtual router on which the event has
occurred.";
}
}
}
case ipv6 {
description
"IPv6.";
container ipv6 {
description
"Error information for IPv6.";
leaf vrid {
type leafref {
path "/if:interfaces/if:interface"
+ "[if:name = current()/../../vrrp:interface]/"
+ "ip:ipv6/vrrp:vrrp/vrrp:vrrp-instance/vrrp:vrid";
}
mandatory true;
description
"Indicates the virtual router on which the event has
occurred.";
}
}
}
}
leaf virtual-router-error-reason {
type identityref {
base vrrp:vrrp-error-virtual-router;
}
mandatory true;
description
"Indicates the reason for the virtual router error.";
}
}
}
<CODE ENDS>
5. IANA Considerations
This document registers the following namespace URI in the "IETF XML
Registry" [RFC3688]:
--------------------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:ietf-vrrp
Registrant Contact: The IESG.
XML: N/A; the requested URI is an XML namespace.
--------------------------------------------------------------------
This document registers the following YANG module in the "YANG Module
Names" registry [RFC7950]:
--------------------------------------------------------------------
name: ietf-vrrp
namespace: urn:ietf:params:xml:ns:yang:ietf-vrrp
prefix: vrrp
reference: RFC 8347
--------------------------------------------------------------------
6. Security Considerations
The YANG module specified in this document defines a schema for data
that is designed to be accessed via network management protocols such
as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer
is the secure transport layer, and the mandatory-to-implement secure
transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer
is HTTPS, and the mandatory-to-implement secure transport is TLS
[RFC5246].
The NETCONF access control model [RFC8341] provides the means to
restrict access for particular NETCONF or RESTCONF users to a
preconfigured subset of all available NETCONF or RESTCONF protocol
operations and content.
There are a number of data nodes defined in this YANG module that are
writable/creatable/deletable (i.e., config true, which is the
default). These data nodes may be considered sensitive or vulnerable
in some network environments. Write operations (e.g., edit-config)
to these data nodes without proper protection can have a negative
effect on network operations. These are the subtrees and data nodes
and their sensitivity/vulnerability:
/if:interfaces/if:interface/ip:ipv4/vrrp:vrrp/vrrp:vrrp-instance
/if:interfaces/if:interface/ip:ipv6/vrrp:vrrp/vrrp:vrrp-instance
Unauthorized access to any data node of these subtrees can adversely
affect the routing subsystem of both the local device and the
network. This may lead to network malfunctions, delivery of packets
to inappropriate destinations, and other problems.
Some of the readable data nodes in this YANG module may be considered
sensitive or vulnerable in some network environments. It is thus
important to control read access (e.g., via get, get-config, or
notification) to these data nodes. These are the subtrees and data
nodes and their sensitivity/vulnerability:
/ietf-vrrp:vrrp
/if:interfaces/if:interface/ip:ipv4/vrrp:vrrp/vrrp:vrrp-instance
/if:interfaces/if:interface/ip:ipv6/vrrp:vrrp/vrrp:vrrp-instance
Unauthorized access to any data node of these subtrees can disclose
the operational state information of VRRP on this device.
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC2787] Jewell, B. and D. Chuang, "Definitions of Managed Objects
for the Virtual Router Redundancy Protocol", RFC 2787,
DOI 10.17487/RFC2787, March 2000,
<https://www.rfc-editor.org/info/rfc2787>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
[RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246,
DOI 10.17487/RFC5246, August 2008,
<https://www.rfc-editor.org/info/rfc5246>.
[RFC5798] Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP)
Version 3 for IPv4 and IPv6", RFC 5798,
DOI 10.17487/RFC5798, March 2010,
<https://www.rfc-editor.org/info/rfc5798>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<https://www.rfc-editor.org/info/rfc6020>.
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<https://www.rfc-editor.org/info/rfc6241>.
[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
<https://www.rfc-editor.org/info/rfc6242>.
[RFC6527] Tata, K., "Definitions of Managed Objects for Virtual
Router Redundancy Protocol Version 3 (VRRPv3)", RFC 6527,
DOI 10.17487/RFC6527, March 2012,
<https://www.rfc-editor.org/info/rfc6527>.
[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
<https://www.rfc-editor.org/info/rfc8040>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in
RFC 2119 Key Words", BCP 14, RFC 8174,
DOI 10.17487/RFC8174, May 2017,
<https://www.rfc-editor.org/info/rfc8174>.
[RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", STD 91, RFC 8341,
DOI 10.17487/RFC8341, March 2018,
<https://www.rfc-editor.org/info/rfc8341>.
[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore Architecture
(NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
<https://www.rfc-editor.org/info/rfc8342>.
[RFC8343] Bjorklund, M., "A YANG Data Model for Interface
Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
<https://www.rfc-editor.org/info/rfc8343>.
[RFC8344] Bjorklund, M., "A YANG Data Model for IP Management",
RFC 8344, DOI 10.17487/RFC8344, March 2018,
<https://www.rfc-editor.org/info/rfc8344>.
7.2. Informative References
[RFC3768] Hinden, R., Ed., "Virtual Router Redundancy Protocol
(VRRP)", RFC 3768, DOI 10.17487/RFC3768, April 2004,
<https://www.rfc-editor.org/info/rfc3768>.
[RFC7224] Bjorklund, M., "IANA Interface Type YANG Module",
RFC 7224, DOI 10.17487/RFC7224, May 2014,
<https://www.rfc-editor.org/info/rfc7224>.
[RFC7951] Lhotka, L., "JSON Encoding of Data Modeled with YANG",
RFC 7951, DOI 10.17487/RFC7951, August 2016,
<https://www.rfc-editor.org/info/rfc7951>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
[Subscribed-Notifications]
Voit, E., Clemm, A., Gonzalez Prieto, A., Nilsen-Nygaard,
E., and A. Tripathy, "Custom Subscription to Event
Streams", Work in Progress, draft-ietf-netconf-subscribed-notifications-
10, draft-ietf-netconf-subscribed-
notifications-10, February 2018.
[YANG-Push]
Clemm, A., Voit, E., Gonzalez Prieto, A., Tripathy, A., Nilsen-
Nygaard,
Nilsen-Nygaard, E., Bierman, A., and B. Lengyel, "YANG
Datastore Subscription", Work in Progress, draft-ietf-netconf-yang-
push-15,
draft-ietf-netconf-yang-push-15, February 2018.
[YANG-Guidelines]
Bierman, A., "Guidelines for Authors and Reviewers of YANG
Data Model Documents", Work in Progress, draft-ietf-
netmod-rfc6087bis-18, February
draft-ietf-netmod-rfc6087bis-20, March 2018.
Appendix A. Data Tree Example
This section contains an example of an instance data tree in JSON
encoding [RFC7951], containing both configuration and state data.
(This example includes "iana-if-type", which is defined in
[RFC7224].)
Virtual router IP address: fe80::1
+-----------------+ +-----------------+
| | | |
| Router 1 | | Router 2 |
| | | |
+--------+--------+ +--------+--------+
|eth1 |eth1
|fe80::11 |fe80::12
-------+--------------------------+-------
| |
|fe80::51 |fe80::52
+--------+--------+ +--------+--------+
| Host 1 | | Host 2 |
| Default gateway:| | Default gateway:|
| fe80::1 | | fe80::1 |
+-----------------+ +-----------------+
The configuration instance data for Router 1 in the above figure
could be as follows:
{
"ietf-interfaces:interfaces": {
"interface": [
{
"name": "eth1",
"description": "An interface with VRRP enabled.",
"type": "iana-if-type:ethernetCsmacd",
"ietf-ip:ipv6": {
"address": [
{
"ip": "2001:db8:0:1::1",
"prefix-length": 64
},
{
"ip": "fe80::11",
"prefix-length": 64
}
],
"forwarding": true,
"ietf-vrrp:vrrp": {
"vrrp-instance": [
{
"vrid": 1,
"version": "vrrp-v3",
"priority": 200,
"advertise-interval-centi-sec": 50,
"virtual-ipv6-addresses": {
"virtual-ipv6-address": [
"ipv6-address": "fe80::1"
]
}
}
]
}
}
}
]
}
}
The corresponding operational state data for Router 1 could be as
follows:
{
"ietf-interfaces:interfaces": {
"interface": [
{
"name": "eth1",
"description": "An interface with VRRP enabled.",
"type": "iana-if-type:ethernetCsmacd",
"phys-address": "00:00:5e:00:53:01",
"oper-status": "up",
"statistics": {
"discontinuity-time": "2016-10-24T17:11:27+02:00"
},
"ietf-ip:ipv6": {
"forwarding": true,
"mtu": 1500,
"address": [
{
"ip": "2001:db8:0:1::1",
"prefix-length": 64,
"origin": "static",
"status": "preferred"
},
{
"ip": "fe80::11",
"prefix-length": 64,
"origin": "static",
"status": "preferred"
}
]
"ietf-vrrp:vrrp": {
"vrrp-instance": [
{
"vrid": 1,
"version": "vrrp-v3",
"log-state-change": false,
"preempt": {
"enabled": true,
"hold-time": 0
}
"priority": 200,
"accept-mode": false,
"advertise-interval-centi-sec": 50,
"virtual-ipv6-addresses": {
"virtual-ipv6-address": [
"ipv6-address": "fe80::1"
]
},
"state": "master",
"is-owner": false,
"last-adv-source": "fe80::11",
"up-datetime": "2016-10-24T17:11:27+02:00",
"master-down-interval": 161,
"skew-time": 11,
"last-event": "vrrp-event-interface-up",
"new-master-reason": "priority",
"statistics": {
"discontinuity-datetime":
"2016-10-24T17:11:27+02:00",
"master-transitions": 2,
"advertisement-recv":
"advertisement-rcvd": 20,
"advertisement-sent": 12,
"interval-errors": 0,
"priority-zero-pkts-rcvd": 0,
"priority-zero-pkts-sent": 0,
"invalid-type-pkts-rcvd": 0,
"address-list-errors": 0,
"packet-length-errors": 1
}
}
]
}
}
}
]
}
}
{
"ietf-vrrp:vrrp": {
"virtual-routers": 3,
"interfaces": 2,
"statistics": {
"discontinuity-datetime": "2016-10-24T17:11:27+02:00",
"checksum-errors": 2,
"version-errors": 0,
"vrid-errors": 0,
"ip-ttl-errors": 1
}
}
}
Authors' Addresses
Xufeng Liu (editor)
Jabil
8281 Greensboro Drive, Suite 200
McLean, VA 22102
United States of America
Email: Xufeng_Liu@jabil.com xufeng.liu.ietf@gmail.com
Athanasios Kyparlis
Jabil
8281 Greensboro Drive, Suite 200
McLean, VA 22102
United States of America
Email: Athanasios_Kyparlis@jabil.com
Ravi Parikh
VMware
3425 Hillview Avenue
Palo Alto, CA 94304
United States of America
Email: parikhr@vmware.com
Acee Lindem
Cisco Systems
301 Midenhall Way
Cary, NC 27513
United States of America
Email: acee@cisco.com
Mingui Zhang
Huawei Technologies
No. 156 Beiqing Rd. Haidian District
Beijing 100095
China
Email: zhangmingui@huawei.com