Network Working Group X. Liu, Editor Internet-Draft A. Kyparlis Intended status: Standards Track R. Parikh Expires: September 8, 2015 Ericsson A. Lindem Cisco Systems M. Zhang Huawei Technologies March 8, 2015 A YANG Data Model for Virtual Router Redundancy Protocol (VRRP) draft-liu-rtgwg-yang-vrrp-01.txt Abstract This document describes a data model for Virtual Router Redundancy Protocol (VRRP). Both version 2 and version 3 of VRRP are covered. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on January 1, 2015. Copyright Notice Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved. Liu Expires September 8, 2015 [Page 1] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://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. Table of Contents 1. Introduction...................................................2 1.1. Terminology...............................................2 2. VRRP YANG model overview.......................................3 3. VRRP YANG module...............................................6 4. Security Considerations.......................................23 5. References....................................................23 5.1. Normative References.....................................23 5.2. Informative References...................................24 1. Introduction This document introduces a YANG [RFC6020] data model for 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 YANG model supports both version 2 and version 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 keywords "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]. The following terms are defined in [RFC6020] and are not redefined here: o augment o data model o data node Liu Expires September 8, 2015 [Page 2] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 2. VRRP YANG model overview This document defines the YANG module "ietf-vrrp", which has the following structure: module: ietf-vrrp augment /if:interfaces/if:interface/ip:ipv4: +--rw vrrp +--rw vrrp-instance* [vrid] +--rw vrid uint8 +--rw version? enumeration +--rw log-state-change? boolean +--rw preempt! | +--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 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 version? enumeration +--rw log-state-change? boolean +--rw preempt! | +--rw hold-time? uint16 +--rw priority? uint8 +--rw accept-mode? boolean +--rw advertise-interval-centi-sec? uint16 +--rw virtual-ipv6-addresses +--rw virtual-ipv6-address* [ipv6-address] +--rw ipv6-address inet:ipv6-address augment /if:interfaces-state/if:interface/ip:ipv4: +--ro vrrp +--ro vrrp-instance* [vrid] +--ro vrid uint8 Liu Expires September 8, 2015 [Page 3] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 +--ro version? enumeration +--ro log-state-change? boolean +--ro preempt! | +--ro hold-time? uint16 +--ro priority? uint8 +--ro accept-mode? boolean +--ro (advertise-interval-choice)? | +--:(v2) | | +--ro advertise-interval-sec? uint8 | +--:(v3) | +--ro advertise-interval-centi-sec? uint16 +--ro virtual-ipv4-addresses | +--ro virtual-ipv4-address* [ipv4-address] | +--ro ipv4-address inet:ipv4-address +--ro state? identityref +--ro is-owner? boolean +--ro last-adv-source? inet:ip-address +--ro up-time? yang:date-and-time +--ro master-down-interval? uint32 +--ro skew-time? uint32 +--ro last-event? string +--ro new-master-reason? enumeration +--ro statistics +--ro discontinuity-time? yang:date-and-time +--ro master-transitions? yang:counter32 +--ro advertisement-recv? 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-state/if:interface/ip:ipv6: +--ro vrrp +--ro vrrp-instance* [vrid] +--ro vrid uint8 +--ro version? enumeration +--ro log-state-change? boolean Liu Expires September 8, 2015 [Page 4] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 +--ro preempt! | +--ro hold-time? uint16 +--ro priority? uint8 +--ro accept-mode? boolean +--ro advertise-interval-centi-sec? uint16 +--ro virtual-ipv6-addresses | +--ro virtual-ipv6-address* [ipv6-address] | +--ro ipv6-address inet:ipv6-address +--ro state? identityref +--ro is-owner? boolean +--ro last-adv-source? inet:ip-address +--ro up-time? yang:date-and-time +--ro master-down-interval? uint32 +--ro skew-time? uint32 +--ro last-event? string +--ro new-master-reason? enumeration +--ro statistics +--ro discontinuity-time? yang:date-and-time +--ro master-transitions? yang:counter32 +--ro advertisement-recv? 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-state: +--ro vrrp-global +--ro virtual-routers? uint32 +--ro interfaces? uint32 +--ro checksum-errors? yang:counter64 +--ro version-errors? yang:counter64 +--ro vrid-errors? yang:counter64 +--ro ip-ttl-errors? yang:counter64 +--ro global-statistics-discontinuity-time? yang:date-and- time rpcs: +---x clear-vrrp-statistics Liu Expires September 8, 2015 [Page 5] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 +--ro input +--ro clear-type? enumeration +--ro interface? if:interface-ref +--ro ip-version? enumeration +--ro vrid-v4? leafref +--ro vrid-v6? leafref 3. VRRP YANG module file "ietf-vrrp@2015-03-08.yang" module ietf-vrrp { namespace "urn:ietf:params:xml:ns:yang:ietf-vrrp"; // replace with IANA namespace when assigned 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 "TBD"; contact "TBD"; description "This YANG module defines a model for managing Virtual Router Redundancy Protocol (VRRP) version 2 and version 3."; revision "2015-03-08" { description "Initial revision"; reference "RFC 2787: Definitions of Managed Objects for the Virtual Liu Expires September 8, 2015 [Page 6] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 Router Redundancy Protocol. RFC 3768: Virtual Router Redundancy Protocol (VRRP). RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3. 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 one 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."; } /* * Identities */ identity vrrp-state-type { description "The type to indicate the state of a virtual router."; } identity initialize { base vrrp-state-type; description "Indicates that the virtual router is waiting for a startup event."; Liu Expires September 8, 2015 [Page 7] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 } 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."; } /* * Groupings */ grouping vrrp-common-attributes { description "Group of VRRP attributes common to version 2 and version 3"; leaf vrid { type uint8 { range 1..255; } description "Virtual router ID."; } leaf version { type enumeration { enum 2 { description "VRRP version 2."; } enum 3 { description "VRRP version 3."; } } description "Version 2 or version 3 of VRRP."; } Liu Expires September 8, 2015 [Page 8] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 leaf log-state-change { type boolean; description "Generates VRRP state change messages each time the VRRP instance changes state (from up to down or down to up)."; } container preempt { presence "Present if preempt is enabled."; description "Enables a higher priority Virtual Router Redundancy Protocol (VRRP) backup router to preempt a lower priority VRRP master."; leaf hold-time { type uint16; 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 Virtual Router Redundancy Protocol (VRRP) election priority for the backup virtual router."; } } // vrrp-common-attributes grouping vrrp-v3-attributes { description "Group of VRRP versin 3 attributes."; leaf accept-mode { type boolean; default false; Liu Expires September 8, 2015 [Page 9] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 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."; } } grouping vrrp-ipv4-attributes { description "Group of VRRP attributes for IPv4."; uses vrrp-common-attributes; uses vrrp-v3-attributes { when "version = 3" { description "Applicable only to version 3."; } } 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 "version = 2" { description "Applicable only to version 2."; } leaf advertise-interval-sec { type uint8 { range 1..254; } default 1; description Liu Expires September 8, 2015 [Page 10] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 "Configures the interval that Virtual Router Redundancy Protocol Version 2 (VRRPv2) advertisements are sent from the specified interface."; } } case v3 { when "version = 3" { 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 Virtual Router Redundancy Protocol version 3 (VRRPv3) advertisements are sent from the specified interface."; } } } // advertise-interval-choice container virtual-ipv4-addresses { description "Configures the virtual IP address for the Virtual Router Redundancy Protocol (VRRP) interface."; list virtual-ipv4-address { key "ipv4-address"; max-elements 16; description "Virtual IP addresses for a single VRRP instance. For a VRRP owner router, the virtual address must match one of the IP addresses configured on the interface corresponding to the virtual router."; leaf ipv4-address { type inet:ipv4-address; description Liu Expires September 8, 2015 [Page 11] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 "Virtual IPv4 address."; } } // 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; uses vrrp-v3-attributes { when "version = 3" { description "Uses VRRP version 3 attributes."; } } // uses vrrp-v3-attributes leaf advertise-interval-centi-sec { type uint16 { range 1..4095; } units centiseconds; default 100; description "Configures the interval that Virtual Router Redundancy Protocol version 3 (VRRPv3) advertisements are sent from the specified interface."; } container virtual-ipv6-addresses { description "Configures the virtual IP address for the Virtual Router Redundancy Protocol (VRRP) interface."; list virtual-ipv6-address { key "ipv6-address"; max-elements 2; description "Two IPv6 addresses are allowed. The first one must be a link-local address and the second one can be a link-local or global address."; Liu Expires September 8, 2015 [Page 12] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 leaf ipv6-address { type inet:ipv6-address; description "Virtual IPv6 address."; } } // 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-state-type; } description "Operational state."; } leaf is-owner { type boolean; description "Set to true if this virtual router is owner."; } leaf last-adv-source { type inet:ip-address; description "Last advertised IPv4/IPv6 source address"; } leaf up-time { type yang:date-and-time; description "The time when this virtual router transitioned out of init state."; } Liu Expires September 8, 2015 [Page 13] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 leaf master-down-interval { type uint32; units centiseconds; description "Time interval for backup virtual router to declare Master down."; } leaf skew-time { type uint32; units microseconds; description "Calculated based on the priority and advertisement interval configuration command parameters. See RFC 3768."; } leaf last-event { type string; description "Last reported event."; } leaf new-master-reason { 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 master-no-response { description "Previous master did not respond."; } } description "Indicates the reason for the virtual router to transition Liu Expires September 8, 2015 [Page 14] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 to master state."; } container statistics { description "VRRP statistics."; leaf discontinuity-time { type yang:date-and-time; description "The time on the most recent occasion at which any one or more of the VRRP statistic 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 { 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; Liu Expires September 8, 2015 [Page 15] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 type yang:counter64; description "The total number of VRRP advertisement packets received with an advertisement interval different than the one 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 Liu Expires September 8, 2015 [Page 16] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 "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 interface with VRRP configured."; } leaf checksum-errors { type yang:counter64; description "The total number of VRRP packets received with an invalid VRRP checksum value."; reference "RFC 5798, 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, 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."; Liu Expires September 8, 2015 [Page 17] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 reference "RFC 5798, 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 (Time-To-Live) not equal to 255"; reference "RFC 5798, Sections 5.1.1.3 and 5.1.2.3."; } leaf global-statistics-discontinuity-time { type yang:date-and-time; description "The time on the most recent occasion at which one of router-checksum-errors, router-version-errors, router-vrid-errors, and ip-ttl-errors suffered a discontinuity. If no such discontinuities have occurred since the last re-initialization of the local management subsystem, then this object will be 0."; } } // grouping vrrp-state-attributes augment "/if:interfaces/if:interface/ip:ipv4" { description "Augment IPv4 interface."; container vrrp { description "Configures the Virtual Router Redundancy Protocol (VRRP) version 2 or version 3 for IPv4."; list vrrp-instance { key vrid; description "Defines a virtual router, identified by a virtual router identifier (VRID), within IPv4 address space."; uses vrrp-ipv4-attributes; Liu Expires September 8, 2015 [Page 18] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 } } } // augment ipv4 augment "/if:interfaces/if:interface/ip:ipv6" { description "Augment IPv6 interface."; container vrrp { description "Configures the Virtual Router Redundancy Protocol (VRRP) version 3 for IPv6."; list vrrp-instance { must "version = 3" { description "IPv6 is only supported by version 3."; } key vrid; description "Defines a virtual router, identified by a virtual router identifier (VRID), within IPv6 address space."; uses vrrp-ipv6-attributes; } // list vrrp-instance } // container vrrp } // augment ipv6 augment "/if:interfaces-state/if:interface/ip:ipv4" { description "Augment IPv4 interface state."; container vrrp { description "State information for Virtual Router Redundancy Protocol (VRRP) version 2 for IPv4."; list vrrp-instance { key vrid; description "States of a virtual router, identified by a virtual router identifier (VRID), within IPv4 address space."; Liu Expires September 8, 2015 [Page 19] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 uses vrrp-ipv4-attributes; uses vrrp-state-attributes; } // list vrrp-instance } } augment "/if:interfaces-state/if:interface/ip:ipv6" { description "Augment IPv6 interface state."; container vrrp { description "State information of the Virtual Router Redundancy Protocol (VRRP) version 2 or version 3 for IPv6."; list vrrp-instance { key vrid; description "States of a virtual router, identified by a virtual router identifier (VRID), within IPv6 address space."; uses vrrp-ipv6-attributes; uses vrrp-state-attributes; } // list vrrp-instance } } augment "/if:interfaces-state" { description "Specify VRRP state data at the global level."; container vrrp-global { description "State information of the Virtual Router Redundancy Protocol (VRRP) at the global level"; uses vrrp-global-state-attributes; } } rpc clear-vrrp-statistics { description "Clears Virtual Router Redundancy Protocol (VRRP) statistics."; Liu Expires September 8, 2015 [Page 20] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 input { leaf clear-type { type enumeration { enum all { description "Clears all VRRP statistics."; } enum global { description "Clears global VRRP statistics."; } enum all-interface { description "Clears VRRP statistics for all interfaces."; } enum interface { description "Clears VRRP statistics for the specified interface."; } enum virtual-router { description "Clears VRRP statistics for the specified virtual router."; } enum scheduler { description "Clear VRRP scheduler statistics."; } } description "Specify the type of information to be cleared."; } leaf interface { when "../clear-type = 'interface' or " +"../clear-type = 'virtual-router'" { description "Valid only when clear-type is interface."; } type if:interface-ref; description Liu Expires September 8, 2015 [Page 21] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 "Specify the interface for which statistics area to be cleared."; } leaf ip-version { when "../clear-type = 'virtual-router'" { description "Valid only when clear-type is virtual-router."; } type enumeration { enum 4 { description "IPv4"; } enum 6 { description "IPv6"; } } description "Specify the IP version."; } leaf vrid-v4 { when "'../clear-type = virtual-router' and" + "'../ip-version = 4'" { description "Valid only when clear-type is virtual-router."; } type leafref { path "/if:interfaces/if:interface" + "[if:name = current()/../interface]/ip:ipv4/vrrp/" + "vrrp-instance/vrid"; } description "Specify the virtual router for which statistics are to be cleared."; } leaf vrid-v6 { when "'../clear-type = virtual-router' and" + "'../ip-version = 4'" { description "Valid only when clear-type is virtual-router."; Liu Expires September 8, 2015 [Page 22] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 } type leafref { path "/if:interfaces/if:interface" + "[if:name = current()/../interface]/ip:ipv6/vrrp/" + "vrrp-instance/vrid"; } description "Specify the virtual router for which statistics are to be cleared."; } } // input } // rpc clear-vrrp-statistics } 4. Security Considerations The configuration, state, action and notification data defined in this document are designed to be accessed via the NETCONF protocol [RFC6241]. The data-model by itself does not create any security implications. The security considerations for the NETCONF protocol are applicable. The NETCONF protocol used for sending the data supports authentication and encryption. 5. Contributors Yuyang Xie Huawei Technologies No. 156 Beiqing Rd. Haidian District Beijing 100095 P.R. China Email: xieyuyang@huawei.com 6. References 6.1. Normative References [RFC6020] Bjorklund, M., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, October 2010. [RFC6021] Schoenwaelder, J., "Common YANG Data Types", RFC 6021, October 2010. Liu Expires September 8, 2015 [Page 23] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 [RFC6241] Enns, R., Bjorklund, M., Schoenwaelder, J., and A. Bierman, "Network Configuration Protocol (NETCONF)", RFC 6241, June 2011. [RFC2234] Crocker, D. and Overell, P.(Editors), "Augmented BNF for Syntax Specifications: ABNF", RFC 2234, Internet Mail Consortium and Demon Internet Ltd., November 1997. [RFC2338] Knight, S., Weaver, D., Whipple, D., Hinden, R., Mitzel, D., Hunt, P., Higginson, P., Shand, M., and A. Lindem, "Virtual Router Redundancy Protocol", RFC 2338, April 1998. [RFC2787] Jewell, B. and D. Chuang, "Definitions of Managed Objects for the Virtual Router Redundancy Protocol", RFC 2787, March 2000. [RFC5798] Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6", RFC 5798, March 2010. [RFC6527] Tata, K., Ed., "Definitions of Managed Objects for the Virtual Router Redundancy Protocol Version 3 (VRRPv3)", RFC 6527, March 2012. 6.2. Informative References [RFC6087] Bierman, A., "Guidelines for Authors and Reviewers of YANG Data Model Documents", RFC 6087, January 2011. Liu Expires September 8, 2015 [Page 24] Internet-Draft draft-liu-rtgwg-yang-vrrp-01.txt March 2015 Authors' Addresses Xufeng Liu (Editor) Ericsson 1595 Spring Hill Road, Suite 500 Vienna, VA 22182 USA Email: xufeng.liu@ericsson.com Athanasios Kyparlis Ericsson 1595 Spring Hill Road, Suite 500 Vienna, VA 22182 USA Email: athanasios.kyparlis@ericsson.com Ravi Parikh Ericsson 300 Holger Way San Jose, CA 95134 USA Email: ravi.parikh@ericsson.com Acee Lindem Cisco Systems 301 Midenhall Way Cary, NC 27513 USA Email: acee@cisco.com Mingui Zhang Huawei Technologies No. 156 Beiqing Rd. Haidian District Beijing 100095 P.R. China Email: zhangmingui@huawei.com Liu Expires September 8, 2015 [Page 25]