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RFC 8349

A YANG Data Model for Routing Management (NMDA Version)

Pages: 80
Proposed Standard
Errata
Obsoletes:  8022
Part 3 of 4 – Pages 37 to 58
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Top   ToC   RFC8349 - Page 37   prevText

9. IPv6 Unicast Routing Management YANG Module

<CODE BEGINS> file "ietf-ipv6-unicast-routing@2018-03-13.yang" module ietf-ipv6-unicast-routing { yang-version "1.1"; namespace "urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing"; prefix "v6ur"; import ietf-routing { prefix "rt"; description "An 'ietf-routing' module version that is compatible with the Network Management Datastore Architecture (NMDA) is required."; } import ietf-inet-types { prefix "inet"; description "An 'ietf-interfaces' module version that is compatible with the Network Management Datastore Architecture (NMDA) is required."; } include ietf-ipv6-router-advertisements { revision-date 2018-03-13; }
Top   ToC   RFC8349 - Page 38
     organization
       "IETF NETMOD (Network Modeling) Working Group";
     contact
       "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
        WG List:  <mailto:rtgwg@ietf.org>

        Editor:   Ladislav Lhotka
                  <mailto:lhotka@nic.cz>
                  Acee Lindem
                  <mailto:acee@cisco.com>
                  Yingzhen Qu
                  <mailto:yingzhen.qu@huawei.com>";

     description
       "This YANG module augments the 'ietf-routing' module with basic
        parameters for IPv6 unicast routing.  The model fully conforms
        to the Network Management Datastore Architecture (NMDA).

        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 8349; see
        the RFC itself for full legal notices.";

     revision 2018-03-13 {
       description
         "Network Management Datastore Architecture (NMDA) revision.";
       reference
         "RFC 8349: A YANG Data Model for Routing Management
                    (NMDA Version)";
     }

     /* Identities */

     revision 2016-11-04 {
          description
            "Initial revision.";
          reference
            "RFC 8022: A YANG Data Model for Routing Management";
     }
Top   ToC   RFC8349 - Page 39
     identity ipv6-unicast {
       base rt:ipv6;
       description
         "This identity represents the IPv6 unicast address family.";
     }

     augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route" {
       when "derived-from-or-self(../../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       description
         "This leaf augments an IPv6 unicast route.";
       leaf destination-prefix {
         type inet:ipv6-prefix;
         description
           "IPv6 destination prefix.";
       }
     }

     augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
           + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
       when "derived-from-or-self(../../../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       description
         "Augments the 'simple-next-hop' case in IPv6 unicast routes.";
       leaf next-hop-address {
         type inet:ipv6-address;
         description
           "IPv6 address of the next hop.";
       }
     }

     augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
           + "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
           + "rt:next-hop-list/rt:next-hop" {
       when "derived-from-or-self(../../../../../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       description
         "This leaf augments the 'next-hop-list' case of IPv6 unicast
          routes.";
Top   ToC   RFC8349 - Page 40
       leaf address {
         type inet:ipv6-address;
         description
           "IPv6 address of the next hop.";
       }
     }

     augment
       "/rt:routing/rt:ribs/rt:rib/rt:active-route/rt:input" {
       when "derived-from-or-self(../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast RIBs.";
       }
       description
         "This augment adds the input parameter of the 'active-route'
          action.";
       leaf destination-address {
         type inet:ipv6-address;
         description
           "IPv6 destination address.";
       }
     }

     augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
           + "rt:output/rt:route" {
       when "derived-from-or-self(../../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       description
         "This augment adds the destination prefix to the reply of the
          'active-route' action.";
       leaf destination-prefix {
         type inet:ipv6-prefix;
         description
           "IPv6 destination prefix.";
       }
     }

     augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
           + "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
           + "rt:simple-next-hop" {
       when "derived-from-or-self(../../../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
Top   ToC   RFC8349 - Page 41
       }
       description
         "Augments the 'simple-next-hop' case in the reply to the
          'active-route' action.";
       leaf next-hop-address {
         type inet:ipv6-address;
         description
           "IPv6 address of the next hop.";
       }
     }

     augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
           + "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
           + "rt:next-hop-list/rt:next-hop-list/rt:next-hop" {
       when "derived-from-or-self(../../../../../rt:address-family, "
          + "'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       description
         "Augments the 'next-hop-list' case in the reply to the
          'active-route' action.";
       leaf next-hop-address {
         type inet:ipv6-address;
         description
           "IPv6 address of the next hop.";
       }
     }

     /* Data node augmentations */

     augment "/rt:routing/rt:control-plane-protocols/"
           + "rt:control-plane-protocol/rt:static-routes" {
       description
         "This augment defines the 'static' pseudo-protocol
          with data specific to IPv6 unicast.";
       container ipv6 {
         description
           "Support for a 'static' pseudo-protocol instance
            consists of a list of routes.";
         list route {
           key "destination-prefix";
           description
             "A list of static routes.";
           leaf destination-prefix {
             type inet:ipv6-prefix;
             mandatory true;
             description
Top   ToC   RFC8349 - Page 42
               "IPv6 destination prefix.";
           }
           leaf description {
             type string;
             description
               "Textual description of the route.";
           }
           container next-hop {
             description
               "Next hop for the route.";
             uses rt:next-hop-content {
               augment "next-hop-options/simple-next-hop" {
                 description
                   "Augments the 'simple-next-hop' case in IPv6 static
                    routes.";
                 leaf next-hop-address {
                   type inet:ipv6-address;
                   description
                     "IPv6 address of the next hop.";
                 }
               }
               augment "next-hop-options/next-hop-list/next-hop-list/"
                     + "next-hop" {
                 description
                   "Augments the 'next-hop-list' case in IPv6 static
                    routes.";
                 leaf next-hop-address {
                   type inet:ipv6-address;
                   description
                     "IPv6 address of the next hop.";
                 }
               }
             }
           }
         }
       }
     }

     /*
      * The subsequent data nodes are obviated and obsoleted
      * by the Network Management Datastore Architecture
      * as described in RFC 8342.
      */
     augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route" {
       when "derived-from-or-self(../../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
Top   ToC   RFC8349 - Page 43
       }
       status obsolete;
       description
         "This leaf augments an IPv6 unicast route.";
       leaf destination-prefix {
         type inet:ipv6-prefix;
         status obsolete;
         description
           "IPv6 destination prefix.";
       }
     }
     augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route/"
             + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
       when "derived-from-or-self(../../../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       status obsolete;
       description
         "Augments the 'simple-next-hop' case in IPv6 unicast routes.";
       leaf next-hop-address {
         type inet:ipv6-address;
         status obsolete;
         description
           "IPv6 address of the next hop.";
       }
     }
     augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route/"
             + "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
             + "rt:next-hop-list/rt:next-hop" {
       when "derived-from-or-self(../../../../../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       status obsolete;
       description
         "This leaf augments the 'next-hop-list' case of IPv6 unicast
          routes.";
       leaf address {
         type inet:ipv6-address;
         status obsolete;
         description
           "IPv6 address of the next hop.";
       }
     }
     augment "/rt:routing-state/rt:ribs/rt:rib/"
Top   ToC   RFC8349 - Page 44
             + "rt:active-route/rt:input" {
       when "derived-from-or-self(../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast RIBs.";
       }
       status obsolete;
       description
         "This augment adds the input parameter of the 'active-route'
          action.";
       leaf destination-address {
         type inet:ipv6-address;
         status obsolete;
         description
           "IPv6 destination address.";
       }
     }
     augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
             + "rt:output/rt:route" {
       when "derived-from-or-self(../../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       status obsolete;
       description
         "This augment adds the destination prefix to the reply of the
          'active-route' action.";
       leaf destination-prefix {
         type inet:ipv6-prefix;
         status obsolete;
         description
           "IPv6 destination prefix.";
       }
     }
     augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
             + "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
             + "rt:simple-next-hop" {
       when "derived-from-or-self(../../../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       status obsolete;
       description
         "Augments the 'simple-next-hop' case in the reply to the
          'active-route' action.";
       leaf next-hop-address {
Top   ToC   RFC8349 - Page 45
         type inet:ipv6-address;
         status obsolete;
         description
           "IPv6 address of the next hop.";
       }
     }
     augment "/rt:routing-state/rt:ribs/rt:rib/rt:active-route/"
             + "rt:output/rt:route/rt:next-hop/rt:next-hop-options/"
             + "rt:next-hop-list/rt:next-hop-list/rt:next-hop" {
       when "derived-from-or-self(../../../../../rt:address-family,
               'v6ur:ipv6-unicast')" {
         description
           "This augment is valid only for IPv6 unicast.";
       }
       status obsolete;
       description
         "Augments the 'next-hop-list' case in the reply to the
          'active-route' action.";
       leaf next-hop-address {
         type inet:ipv6-address;
         status obsolete;
         description
           "IPv6 address of the next hop.";
       }
     }
   }

   <CODE ENDS>

9.1. IPv6 Router Advertisements Submodule

<CODE BEGINS> file "ietf-ipv6-router-advertisements@2018-03-13.yang" submodule ietf-ipv6-router-advertisements { yang-version "1.1"; belongs-to ietf-ipv6-unicast-routing { prefix "v6ur"; } import ietf-inet-types { prefix "inet"; } import ietf-interfaces { prefix "if"; description "An 'ietf-interfaces' module version that is compatible with
Top   ToC   RFC8349 - Page 46
          the Network Management Datastore Architecture (NMDA)
          is required.";
     }

     import ietf-ip {
       prefix "ip";
       description
         "An 'ietf-ip' module version that is compatible with
          the Network Management Datastore Architecture (NMDA)
          is required.";
     }

     organization
       "IETF NETMOD (Network Modeling) Working Group";
     contact
       "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
        WG List:  <mailto:rtgwg@ietf.org>

        Editor:   Ladislav Lhotka
                  <mailto:lhotka@nic.cz>
                  Acee Lindem
                  <mailto:acee@cisco.com>
                  Yingzhen Qu
                  <mailto:yingzhen.qu@huawei.com>";

     description
       "This YANG module augments the 'ietf-ip' module with
        parameters for IPv6 Router Advertisements.  The model fully
        conforms to the Network Management Datastore
        Architecture (NMDA).

        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 8349; see
        the RFC itself for full legal notices.";

     reference
       "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)";

     revision 2018-03-13 {
Top   ToC   RFC8349 - Page 47
       description
         "Network Management Datastore Architecture (NMDA) revision.";
       reference
         "RFC 8349: A YANG Data Model for Routing Management
                    (NMDA Version)";
     }

     revision 2016-11-04 {
          description
            "Initial revision.";
          reference
            "RFC 8022: A YANG Data Model for Routing Management";
     }

     augment "/if:interfaces/if:interface/ip:ipv6" {
       description
         "Augments interface configuration with parameters of IPv6
          Router Advertisements.";
       container ipv6-router-advertisements {
         description
           "Support for IPv6 Router Advertisements.";
         leaf send-advertisements {
           type boolean;
           default "false";
           description
             "A flag indicating whether or not the router sends
              periodic Router Advertisements and responds to
              Router Solicitations.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvSendAdvertisements";
         }
         leaf max-rtr-adv-interval {
           type uint16 {
             range "4..65535";
           }
           units "seconds";
           default "600";
           description
             "The maximum time allowed between sending unsolicited
              multicast Router Advertisements from the interface.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - MaxRtrAdvInterval";
         }
         leaf min-rtr-adv-interval {
           type uint16 {
             range "3..1350";
Top   ToC   RFC8349 - Page 48
           }
           units "seconds";
           must ". <= 0.75 * ../max-rtr-adv-interval" {
             description
               "The value MUST NOT be greater than 75% of
                'max-rtr-adv-interval'.";
           }
           description
             "The minimum time allowed between sending unsolicited
              multicast Router Advertisements from the interface.

              The default value to be used operationally if this
              leaf is not configured is determined as follows:

              - if max-rtr-adv-interval >= 9 seconds, the default
                value is 0.33 * max-rtr-adv-interval;

              - otherwise, it is 0.75 * max-rtr-adv-interval.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - MinRtrAdvInterval";
         }
         leaf managed-flag {
           type boolean;
           default "false";
           description
             "The value to be placed in the 'Managed address
              configuration' flag field in the Router
              Advertisement.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvManagedFlag";
         }
         leaf other-config-flag {
           type boolean;
           default "false";
           description
             "The value to be placed in the 'Other configuration'
              flag field in the Router Advertisement.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvOtherConfigFlag";
         }
         leaf link-mtu {
           type uint32;
           default "0";
           description
             "The value to be placed in MTU options sent by the
Top   ToC   RFC8349 - Page 49
              router.  A value of zero indicates that no MTU options
              are sent.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvLinkMTU";
         }
         leaf reachable-time {
           type uint32 {
             range "0..3600000";
           }
           units "milliseconds";
           default "0";
           description
             "The value to be placed in the Reachable Time field in
              the Router Advertisement messages sent by the router.
              A value of zero means unspecified (by this router).";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvReachableTime";
         }
         leaf retrans-timer {
           type uint32;
           units "milliseconds";
           default "0";
           description
             "The value to be placed in the Retrans Timer field in
              the Router Advertisement messages sent by the router.
              A value of zero means unspecified (by this router).";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvRetransTimer";
         }
         leaf cur-hop-limit {
           type uint8;
           description
             "The value to be placed in the Cur Hop Limit field in
              the Router Advertisement messages sent by the router.
              A value of zero means unspecified (by this router).

              If this parameter is not configured, the device SHOULD
              use the IANA-specified value for the default IPv4
              Time to Live (TTL) parameter that was in effect at the
              time of implementation.";
           reference
             "RFC 3232: Assigned Numbers: RFC 1700 is Replaced by
                        an On-line Database
              RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvCurHopLimit
Top   ToC   RFC8349 - Page 50
              IANA: IP Parameters
                    (https://www.iana.org/assignments/ip-parameters)";
         }
         leaf default-lifetime {
           type uint16 {
             range "0..65535";
           }
           units "seconds";
           description
             "The value to be placed in the Router Lifetime field of
              Router Advertisements sent from the interface, in
              seconds.  It MUST be either zero or between
              max-rtr-adv-interval and 9000 seconds.  A value of zero
              indicates that the router is not to be used as a
              default router.  These limits may be overridden by
              specific documents that describe how IPv6 operates over
              different link layers.

              If this parameter is not configured, the device SHOULD
              use a value of 3 * max-rtr-adv-interval.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvDefaultLifetime";
         }
         container prefix-list {
           description
             "Support for prefixes to be placed in Prefix
              Information options in Router Advertisement messages
              sent from the interface.

              Prefixes that are advertised by default but do not
              have their entries in the child 'prefix' list are
              advertised with the default values of all parameters.

              The link-local prefix SHOULD NOT be included in the
              list of advertised prefixes.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        - AdvPrefixList";
           list prefix {
             key "prefix-spec";
             description
               "Support for an advertised prefix entry.";
             leaf prefix-spec {
               type inet:ipv6-prefix;
               description
                 "IPv6 address prefix.";
             }
Top   ToC   RFC8349 - Page 51
             choice control-adv-prefixes {
               default "advertise";
               description
                 "Either (1) the prefix is explicitly removed from the
                  set of advertised prefixes or (2) the parameters with
                  which the prefix is advertised are specified (default
                  case).";
               leaf no-advertise {
                 type empty;
                 description
                   "The prefix will not be advertised.

                    This can be used for removing the prefix from
                    the default set of advertised prefixes.";
               }
               case advertise {
                 leaf valid-lifetime {
                   type uint32;
                   units "seconds";
                   default "2592000";
                   description
                     "The value to be placed in the Valid Lifetime
                      in the Prefix Information option.  The
                      designated value of all 1's (0xffffffff)
                       represents infinity.";
                   reference
                     "RFC 4861: Neighbor Discovery for IP version 6
                                (IPv6) - AdvValidLifetime";
                 }
                 leaf on-link-flag {
                   type boolean;
                   default "true";
                   description
                     "The value to be placed in the on-link flag
                      ('L-bit') field in the Prefix Information
                      option.";
                   reference
                     "RFC 4861: Neighbor Discovery for IP version 6
                                (IPv6) - AdvOnLinkFlag";
                 }
                 leaf preferred-lifetime {
                   type uint32;
                   units "seconds";
                   must ". <= ../valid-lifetime" {
                     description
                       "This value MUST NOT be greater than
                        valid-lifetime.";
                   }
Top   ToC   RFC8349 - Page 52
                   default "604800";
                   description
                     "The value to be placed in the Preferred
                      Lifetime in the Prefix Information option.
                      The designated value of all 1's (0xffffffff)
                      represents infinity.";
                   reference
                     "RFC 4861: Neighbor Discovery for IP version 6
                                (IPv6) - AdvPreferredLifetime";
                 }
                 leaf autonomous-flag {
                   type boolean;
                   default "true";
                   description
                     "The value to be placed in the Autonomous Flag
                      field in the Prefix Information option.";
                   reference
                     "RFC 4861: Neighbor Discovery for IP version 6
                                (IPv6) - AdvAutonomousFlag";
                 }
               }
             }
           }
         }
       }
     }

     /*
      * The subsequent data nodes are obviated and obsoleted
      * by the Network Management Datastore Architecture
      * as described in RFC 8342.
      */
     augment "/if:interfaces-state/if:interface/ip:ipv6" {
       status obsolete;
       description
         "Augments interface state data with parameters of IPv6
          Router Advertisements.";
       container ipv6-router-advertisements {
         status obsolete;
         description
           "Parameters of IPv6 Router Advertisements.";
         leaf send-advertisements {
           type boolean;
           status obsolete;
           description
             "A flag indicating whether or not the router sends
              periodic Router Advertisements and responds to
              Router Solicitations.";
Top   ToC   RFC8349 - Page 53
         }
         leaf max-rtr-adv-interval {
           type uint16 {
             range "4..1800";
           }
           units "seconds";
           status obsolete;
           description
             "The maximum time allowed between sending unsolicited
              multicast Router Advertisements from the interface.";
         }
         leaf min-rtr-adv-interval {
           type uint16 {
             range "3..1350";
           }
           units "seconds";
           status obsolete;
           description
             "The minimum time allowed between sending unsolicited
              multicast Router Advertisements from the interface.";
         }
         leaf managed-flag {
           type boolean;
           status obsolete;
           description
             "The value that is placed in the 'Managed address
              configuration' flag field in the Router Advertisement.";
         }
         leaf other-config-flag {
           type boolean;
           status obsolete;
           description
             "The value that is placed in the 'Other configuration' flag
              field in the Router Advertisement.";
         }
         leaf link-mtu {
           type uint32;
           status obsolete;
           description
             "The value that is placed in MTU options sent by the
              router.  A value of zero indicates that no MTU options
              are sent.";
         }
         leaf reachable-time {
           type uint32 {
             range "0..3600000";
           }
           units "milliseconds";
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           status obsolete;
           description
             "The value that is placed in the Reachable Time field in
              the Router Advertisement messages sent by the router.  A
              value of zero means unspecified (by this router).";
         }
         leaf retrans-timer {
           type uint32;
           units "milliseconds";
           status obsolete;
           description
             "The value that is placed in the Retrans Timer field in the
              Router Advertisement messages sent by the router.  A value
              of zero means unspecified (by this router).";
         }
         leaf cur-hop-limit {
           type uint8;
           status obsolete;
           description
             "The value that is placed in the Cur Hop Limit field in the
              Router Advertisement messages sent by the router.  A value
              of zero means unspecified (by this router).";
         }
         leaf default-lifetime {
           type uint16 {
             range "0..9000";
           }
           units "seconds";
           status obsolete;
           description
             "The value that is placed in the Router Lifetime field of
              Router Advertisements sent from the interface, in seconds.
              A value of zero indicates that the router is not to be
              used as a default router.";
         }
         container prefix-list {
           status obsolete;
           description
             "A list of prefixes that are placed in Prefix Information
              options in Router Advertisement messages sent from the
              interface.

              By default, these are all prefixes that the router
              advertises via routing protocols as being on-link for the
              interface from which the advertisement is sent.";
           list prefix {
             key "prefix-spec";
             status obsolete;
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             description
               "Advertised prefix entry and its parameters.";
             leaf prefix-spec {
               type inet:ipv6-prefix;
               status obsolete;
               description
                 "IPv6 address prefix.";
             }
             leaf valid-lifetime {
               type uint32;
               units "seconds";
               status obsolete;
               description
                 "The value that is placed in the Valid Lifetime in the
                  Prefix Information option.  The designated value of
                  all 1's (0xffffffff) represents infinity.

                  An implementation SHOULD keep this value constant in
                  consecutive advertisements, except when it is
                  explicitly changed in configuration.";
             }
             leaf on-link-flag {
               type boolean;
               status obsolete;
               description
                 "The value that is placed in the on-link flag ('L-bit')
                  field in the Prefix Information option.";
             }
             leaf preferred-lifetime {
               type uint32;
               units "seconds";
               status obsolete;
               description
                 "The value that is placed in the Preferred Lifetime in
                  the Prefix Information option, in seconds.  The
                  designated value of all 1's (0xffffffff) represents
                  infinity.

                  An implementation SHOULD keep this value constant in
                  consecutive advertisements, except when it is
                  explicitly changed in configuration.";
             }
             leaf autonomous-flag {
               type boolean;
               status obsolete;
               description
                 "The value that is placed in the Autonomous Flag field
                  in the Prefix Information option.";
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             }
           }
         }
       }
     }
   }

   <CODE ENDS>

10. IANA Considerations

[RFC8022] registered the following namespace URIs in the "IETF XML Registry" [RFC3688]. IANA has updated the references to refer to this document. URI: urn:ietf:params:xml:ns:yang:ietf-routing Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. [RFC8022] registered the following YANG modules in the "YANG Module Names" registry [RFC6020]. IANA has updated (1) the modules per this document and (2) the references to refer to this document. Name: ietf-routing Namespace: urn:ietf:params:xml:ns:yang:ietf-routing Prefix: rt Reference: RFC 8349 Name: ietf-ipv4-unicast-routing Namespace: urn:ietf:params:xml:ns:yang:ietf-ipv4-unicast-routing Prefix: v4ur Reference: RFC 8349 Name: ietf-ipv6-unicast-routing Namespace: urn:ietf:params:xml:ns:yang:ietf-ipv6-unicast-routing Prefix: v6ur Reference: RFC 8349
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   This document registers the following YANG submodule in the "YANG
   Module Names" registry [RFC6020]:

   Name:      ietf-ipv6-router-advertisements
   Module:    ietf-ipv6-unicast-routing
   Reference: RFC 8349

11. Security Considerations

The YANG modules specified in this document define 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 these YANG modules 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: /routing/control-plane-protocols/control-plane-protocol: This list specifies the control-plane protocols configured on a device. /routing/ribs/rib: This list specifies the RIBs configured for the device. Some of the readable data nodes in these YANG modules 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: /routing/control-plane-protocols/control-plane-protocol: This list specifies the control-plane protocols configured on a device. Refer to the control-plane models for a list of sensitive information.
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   /routing/ribs/rib:  This list specifies the RIBs and their contents
      for the device.  Access to this information may disclose the
      network topology and/or other information.

   Some of the RPC operations in this YANG module may be considered
   sensitive or vulnerable in some network environments.  It is thus
   important to control access to these operations.  These are the
   operations and their sensitivity/vulnerability:

   /routing/ribs/rib/active-route:  The output from this RPC operation
      returns the route that is being used for a specified destination.
      Access to this information may disclose the network topology or
      relationship (e.g., client/provider).  Additionally, the routes
      used by a network device may be used to mount a subsequent attack
      on traffic traversing the network device.



(page 58 continued on part 4)

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