module ieee802-dot1q-types {

    yang-version 1;

    namespace
      'urn:ieee:std:802.1Q:yang:ieee802-dot1q-types';

    prefix dot1q-types;

    import ietf-yang-types {
      prefix yang;
    }

    organization "IEEE 802.1 Working Group";

    contact
      "WG-URL: http://www.ieee802.org/1/
    WG-EMail: stds-802-1-L@ieee.org
    
    Contact: IEEE 802.1 Working Group Chair
    Postal: C/O IEEE 802.1 Working Group
            IEEE Standards Association
            445 Hoes Lane
            P.O. Box 1331
            Piscataway
            NJ 08855-1331
            USA
    
    E-mail: STDS-802-1-L@IEEE.ORG";

    description
      "Common types used within dot1Q-bridge modules.";

    revision "2018-03-07" {
      description
        "Published as part of IEEE Std 802.1Q-2018.
      Initial version.";
      reference
        "IEEE Std 802.1Q-2018, Bridges and Bridged Networks.";

    }


    identity dot1q-vlan-type {
      description
        "Base identity from which all 802.1Q VLAN tag types are derived
      from.";
    }

    identity c-vlan {
      base dot1q-vlan-type;
      description
        "An 802.1Q Customer VLAN, using the 81-00 EtherType";
      reference
        "5.5 of IEEE Std 802.1Q-2018";

    }

    identity s-vlan {
      base dot1q-vlan-type;
      description
        "An 802.1Q Service VLAN, using the 88-A8 EtherType originally
      introduced in 802.1ad, and incorporated into 802.1Q (2011)";
      reference
        "5.6 of IEEE Std 802.1Q-2018";

    }

    typedef name-type {
      type string {
        length "0..32";
      }
      description
        "A text string of up to 32 characters, of locally determined
      significance.";
    }

    typedef port-number-type {
      type uint32 {
        range "1..65535";
      }
      description
        "The port number of the Bridge port for which this entry
      contains Bridge management information.";
    }

    typedef priority-type {
      type uint8 {
        range "0..7";
      }
      description
        "A range of priorities from 0 to 7 (inclusive). The Priority
      Code Point (PCP) is a 3-bit field that refers to the class of
      service associated with an 802.1Q VLAN tagged frame. The field
      specifies a priority value between 0 and 7, these values can be
      used by quality of service (QoS) to prioritize different classes
      of traffic.";
    }

    typedef vid-range-type {
      type string {
        pattern
          "([1-9]"
            + "[0-9]{0,3}"
            + "(-[1-9][0-9]{0,3})?"
            + "(,[1-9][0-9]{0,3}(-[1-9][0-9]{0,3})?)*)";
      }
      description
        "A list of VLAN Ids, or non overlapping VLAN ranges, in
      ascending order, between 1 and 4094.
      
      This type is used to match an ordered list of VLAN Ids, or
      contiguous ranges of VLAN Ids. Valid VLAN Ids must be in the
      range 1 to 4094, and included in the list in non overlapping
      ascending order.
      
      For example: 1,10-100,250,500-1000";
    }

    typedef vlanid {
      type uint16 {
        range "1..4094";
      }
      description
        "The vlanid type uniquely identifies a VLAN. This is the 12-bit
      VLAN-ID used in the VLAN Tag header. The range is defined by the
      referenced specification. This type is in the value set and its
      semantics equivalent to the VlanId textual convention of the
      SMIv2.";
    }

    typedef vlan-index-type {
      type uint32 {
        range "1..4094 | 4096..4294967295";
      }
      description
        "A value used to index per-VLAN tables. Values of 0 and 4095 are
      not permitted. The range of valid VLAN indices. If the value is
      greater than 4095, then it represents a VLAN with scope local to
      the particular agent, i.e., one without a global VLAN-ID
      assigned to it. Such VLANs are outside the scope of IEEE 802.1Q,
      but it is convenient to be able to manage them in the same way
      using this YANG module.";
      reference
        "9.6 of IEEE Std 802.1Q-2018";

    }

    typedef mstid-type {
      type uint32 {
        range "1..4094";
      }
      description
        "In an MSTP Bridge, an MSTID, i.e., a value used to identify a
      spanning tree (or MST) instance";
      reference
        "13.8 of IEEE Std 802.1Q-2018";

    }

    typedef pcp-selection-type {
      type enumeration {
        enum "8P0D" {
          value 0;
          description
            "8 priorities, 0 drop eligible";
        }
        enum "7P1D" {
          value 1;
          description
            "7 priorities, 1 drop eligible";
        }
        enum "6P2D" {
          value 2;
          description
            "6 priorities, 2 drop eligible";
        }
        enum "5P3D" {
          value 3;
          description
            "5 priorities, 3 drop eligible";
        }
      }
      description
        "Priority Code Point selection types.";
      reference
        "12.6.2.5.3 of IEEE Std 802.1Q-2018
        6.9.3 of IEEE Std 802.1Q-2018";

    }

    typedef protocol-frame-format-type {
      type enumeration {
        enum "Ethernet" {
          value 0;
          description
            "Ethernet frame format";
        }
        enum "rfc1042" {
          value 1;
          description
            "RFC 1042 frame format";
        }
        enum "snap8021H" {
          value 2;
          description
            "SNAP 802.1H frame format";
        }
        enum "snapOther" {
          value 3;
          description
            "Other SNAP frame format";
        }
        enum "llcOther" {
          value 4;
          description
            "Other LLC frame format";
        }
      }
      description
        "A value representing the frame format to be matched.";
      reference
        "12.10.1.7.1 of IEEE Std 802.1Q-2018";

    }

    typedef ethertype-type {
      type string {
        pattern
          "[0-9a-fA-F]{2}-[0-9a-fA-F]{2}";
      }
      description
        "The EtherType value represented in the canonical order defined
      by IEEE 802. The canonical representation uses uppercase
      characters.";
      reference
        "9.2 of IEEE Std 802-2014";

    }

    typedef dot1q-tag-type {
      type identityref {
        base dot1q-vlan-type;
      }
      description
        "Identifies a specific 802.1Q tag type";
      reference
        "IEEE Std 802.1Q-2018";

    }

    typedef traffic-class-type {
      type uint8 {
        range "0..7";
      }
      description
        "This is the numerical value associated with a traffic class in
      a Bridge. Larger values are associated with higher priority
      traffic classes.";
      reference
        "3.239 of IEEE Std 802.1Q-2018";

    }

    grouping dot1q-tag-classifier-grouping {
      description
        "A grouping which represents an 802.1Q VLAN, matching both the
      EtherType and a single VLAN Id.";
      leaf tag-type {
        type dot1q-tag-type;
        mandatory true;
        description "VLAN type";
      }

      leaf vlan-id {
        type vlanid;
        mandatory true;
        description "VLAN Id";
      }
    }  // grouping dot1q-tag-classifier-grouping

    grouping dot1q-tag-or-any-classifier-grouping {
      description
        "A grouping which represents an 802.1Q VLAN, matching both the
      EtherType and a single VLAN Id or 'any' to match on any VLAN Id.";
      leaf tag-type {
        type dot1q-tag-type;
        mandatory true;
        description "VLAN type";
      }

      leaf vlan-id {
        type union {
          type vlanid;
          type enumeration {
            enum "any" {
              value 4095;
              description
                "Matches 'any' VLAN in the range 1 to 4094 that is not
              matched by a more specific VLAN Id match";
            }
          }
        }
        mandatory true;
        description "VLAN Id or any";
      }
    }  // grouping dot1q-tag-or-any-classifier-grouping

    grouping dot1q-tag-ranges-classifier-grouping {
      description
        "A grouping which represents an 802.1Q VLAN that matches a range
      of VLAN Ids.";
      leaf tag-type {
        type dot1q-tag-type;
        mandatory true;
        description "VLAN type";
      }

      leaf vlan-ids {
        type vid-range-type;
        mandatory true;
        description "VLAN Ids";
      }
    }  // grouping dot1q-tag-ranges-classifier-grouping

    grouping dot1q-tag-ranges-or-any-classifier-grouping {
      description
        "A grouping which represents an 802.1Q VLAN, matching both the
      EtherType and a single VLAN Id, ordered list of ranges, or 'any'
      to match on any VLAN Id.";
      leaf tag-type {
        type dot1q-tag-type;
        mandatory true;
        description "VLAN type";
      }

      leaf vlan-id {
        type union {
          type vid-range-type;
          type enumeration {
            enum "any" {
              value 4095;
              description
                "Matches 'any' VLAN in the range 1 to 4094.";
            }
          }
        }
        mandatory true;
        description "VLAN Ids or any";
      }
    }  // grouping dot1q-tag-ranges-or-any-classifier-grouping

    grouping priority-regeneration-table-grouping {
      description
        "The priority regeneration table provides the ability to map
      incoming priority values on a per-Port basis, under management
      control.";
      reference
        "6.9.4 of IEEE Std 802.1Q-2018";

      leaf priority0 {
        type priority-type;
        default "0";
        description "Priority 0";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority1 {
        type priority-type;
        default "1";
        description "Priority 1";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority2 {
        type priority-type;
        default "2";
        description "Priority 2";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority3 {
        type priority-type;
        default "3";
        description "Priority 3";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority4 {
        type priority-type;
        default "4";
        description "Priority 4";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority5 {
        type priority-type;
        default "5";
        description "Priority 5";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority6 {
        type priority-type;
        default "6";
        description "Priority 6";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }

      leaf priority7 {
        type priority-type;
        default "7";
        description "Priority 7";
        reference
          "12.6.2.3 of IEEE Std 802.1Q-2018
          6.9.4 of IEEE Std 802.1Q-2018";

      }
    }  // grouping priority-regeneration-table-grouping

    grouping pcp-decoding-table-grouping {
      description
        "The Priority Code Point decoding table enables the decoding of
      the priority and drop-eligible parameters from the PCP.";
      reference
        "6.9.3 of IEEE Std 802.1Q-2018";

      list pcp-decoding-map {
        key "pcp";
        description
          "This map associates the priority code point field found in
        the VLAN to a priority and drop eligible value based upon the
        priority code point selection type.";
        leaf pcp {
          type pcp-selection-type;
          description
            "The priority code point selection type.";
          reference
            "12.6.2.7 of IEEE Std 802.1Q-2018
            6.9.3 of IEEE Std 802.1Q-2018";

        }

        list priority-map {
          key "priority-code-point";
          description
            "This map associated a priority code point value to priority
          and drop eligible parameters.";
          leaf priority-code-point {
            type priority-type;
            description
              "Priority associated with the pcp.";
            reference
              "12.6.2.7 of IEEE Std 802.1Q-2018
              6.9.3 of IEEE Std 802.1Q-2018";

          }

          leaf priority {
            type priority-type;
            description
              "Priority associated with the pcp.";
            reference
              "12.6.2.7 of IEEE Std 802.1Q-2018
              6.9.3 of IEEE Std 802.1Q-2018";

          }

          leaf drop-eligible {
            type boolean;
            description
              "Drop eligible value for pcp";
            reference
              "12.6.2.7 of IEEE Std 802.1Q-2018
              6.9.3 of IEEE Std 802.1Q-2018";

          }
        }  // list priority-map
      }  // list pcp-decoding-map
    }  // grouping pcp-decoding-table-grouping

    grouping pcp-encoding-table-grouping {
      description
        "The Priority Code Point encoding table encodes the priority and
      drop-eligible parameters in the PCP field of the VLAN tag.";
      reference
        "12.6.2.9 of IEEE Std 802.1Q-2018
        6.9.3 of IEEE Std 802.1Q-2018";

      list pcp-encoding-map {
        key "pcp";
        description
          "This map associated the priority and drop-eligible parameters
        to the priority used to encode the PCP of the VLAN based upon
        the priority code point selection type.";
        leaf pcp {
          type pcp-selection-type;
          description
            "The priority code point selection type.";
          reference
            "12.6.2.7 of IEEE Std 802.1Q-2018
            6.9.3 of IEEE Std 802.1Q-2018";

        }

        list priority-map {
          key "priority dei";
          description
            "This map associated the priority and drop-eligible
          parameters to the priority code point field of the VLAN tag.";
          leaf priority {
            type priority-type;
            description
              "Priority associated with the pcp.";
            reference
              "12.6.2.7 of IEEE Std 802.1Q-2018
              6.9.3 of IEEE Std 802.1Q-2018";

          }

          leaf dei {
            type boolean;
            description
              "The drop eligible value.";
            reference
              "12.6.2 of IEEE Std 802.1Q-2018
              8.6.6 of IEEE Std 802.1Q-2018";

          }

          leaf priority-code-point {
            type priority-type;
            description
              "PCP value for priority when DEI value";
            reference
              "12.6.2.9 of IEEE Std 802.1Q-2018
              6.9.3 of IEEE Std 802.1Q-2018";

          }
        }  // list priority-map
      }  // list pcp-encoding-map
    }  // grouping pcp-encoding-table-grouping

    grouping service-access-priority-table-grouping {
      description
        "The Service Access Priority Table associates a received
      priority with a serice access priority.";
      reference
        "12.6.2.17 of IEEE Std 802.1Q-2018
        6.13.1 of IEEE Std 802.1Q-2018";

      leaf priority0 {
        type priority-type;
        default "0";
        description
          "Service access priority value for priority 0";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority1 {
        type priority-type;
        default "1";
        description
          "Service access priority value for priority 1";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority2 {
        type priority-type;
        default "2";
        description
          "Service access priority value for priority 2";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority3 {
        type priority-type;
        default "3";
        description
          "Service access priority value for priority 3";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority4 {
        type priority-type;
        default "4";
        description
          "Service access priority value for priority 4";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority5 {
        type priority-type;
        default "5";
        description
          "Service access priority value for priority 5";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority6 {
        type priority-type;
        default "6";
        description
          "Service access priority value for priority 6";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }

      leaf priority7 {
        type priority-type;
        default "7";
        description
          "Service access priority value for priority 7";
        reference
          "12.6.2.17 of IEEE Std 802.1Q-2018
          6.13.1 of IEEE Std 802.1Q-2018";

      }
    }  // grouping service-access-priority-table-grouping

    grouping traffic-class-table-grouping {
      description
        "The Traffic Class Table models the operations that can be
      performed on, or inquire about, the current contents of the
      Traffic Class Table (8.6.6) for a given Port.";
      reference
        "12.6.3 of IEEE Std 802.1Q-2018
        8.6.6 of IEEE Std 802.1Q-2018";

      list traffic-class-map {
        key "priority";
        description
          "The priority index into the traffic class table.";
        leaf priority {
          type priority-type;
          description
            "The priority of the traffic class entry.";
          reference
            "8.6.6 of IEEE Std 802.1Q-2018";

        }

        list available-traffic-class {
          key "num-traffic-class";
          description
            "The traffic class index associated with a given priority
          within the traffic class table.";
          reference
            "8.6.6 of IEEE Std 802.1Q-2018";

          leaf num-traffic-class {
            type uint8 {
              range "1..8";
            }
            description
              "The available number of traffic classes.";
            reference
              "8.6.6 of IEEE Std 802.1Q-2018";

          }

          leaf traffic-class {
            type traffic-class-type;
            description
              "The traffic class index associated with a given traffic
            class entry.";
            reference
              "8.6.6 of IEEE Std 802.1Q-2018";

          }
        }  // list available-traffic-class
      }  // list traffic-class-map
    }  // grouping traffic-class-table-grouping

    grouping port-map-grouping {
      description
        "A set of control indicators, one for each Port. A Port Map,
      containing a control element for each outbound Port";
      reference
        "8.8.1 of IEEE Std 802.1Q-2018
        8.8.2 of IEEE Std 802.1Q-2018";

      list port-map {
        key "port-ref";
        description
          "The list of entries composing the port map.";
        leaf port-ref {
          type port-number-type;
          description
            "The interface port reference associated with this map.";
          reference
            "8.8.1 of IEEE Std 802.1Q-2018";

        }

        choice map-type {
          description "Type of port map";
          container static-filtering-entries {
            description
              "Static filtering entries attributes.";
            leaf control-element {
              type enumeration {
                enum "forward" {
                  value 0;
                  description
                    "Forwarded, independently of any dynamic filtering
                  information held by the FDB.";
                }
                enum "filter" {
                  value 1;
                  description
                    "Filtered, independently of any dynamic filtering
                  information.";
                }
                enum "forward-filter" {
                  value 2;
                  description
                    "Forwarded or filtered on the basis of dynamic
                  filtering information, or on the basis of the
                  default Group filtering behavior for the outbound
                  Port (8.8.6) if no dynamic filtering information is
                  present specifically for the MAC address.";
                }
              }
              description
                "containing a control element for each outbound Port,
              specifying that a frame with a destination MAC address,
              and in the case of VLAN Bridge components, VID that
              meets this specification.";
              reference
                "8.8.1 of IEEE Std 802.1Q-2018";

            }

            leaf connection-identifier {
              type port-number-type;
              description
                "A Port MAP may contain a connection identifier (8.8.12)
              for each outbound port. The connection identifier may be
              associated with the Bridge Port value maintained in a
              Dynamic Filtering Entry of the FDB for Bridge Ports.";
              reference
                "8.8.1 of IEEE Std 802.1Q-2018
                8.8.12 of IEEE Std 802.1Q-2018";

            }
          }  // container static-filtering-entries
          container static-vlan-registration-entries {
            description
              "Static VLAN registration entries.";
            leaf registrar-admin-control {
              type enumeration {
                enum "fixed-new-ignored" {
                  value 0;
                  description
                    "Registration Fixed (New ignored).";
                }
                enum "fixed-new-propagated" {
                  value 1;
                  description
                    "Registration Fixed (New propagated.";
                }
                enum "forbidden" {
                  value 2;
                  description
                    "Registration Forbidden.";
                }
                enum "normal" {
                  value 3;
                  description
                    "Normal Registration.";
                }
              }
              description
                "The Registrar Administrative Control values for MVRP
              and MIRP for the VID.";
              reference
                "8.8.2 of IEEE Std 802.1Q-2018";

            }

            leaf vlan-transmitted {
              type enumeration {
                enum "tagged" {
                  value 0;
                  description "VLAN-tagged";
                }
                enum "untagged" {
                  value 1;
                  description
                    "VLAN-untagged";
                }
              }
              description
                "Whether frames are to be VLAN-tagged or untagged when
              transmitted.";
              reference
                "8.8.2 of IEEE Std 802.1Q-2018";

            }
          }  // container static-vlan-registration-entries
          container mac-address-registration-entries {
            description
              "MAC address registration entries attributes.";
            leaf control-element {
              type enumeration {
                enum "registered" {
                  value 0;
                  description
                    "Forwarded, independently of any dynamic filtering
                  information held by the FDB.";
                }
                enum "not-registered" {
                  value 1;
                  description
                    "Filtered, independently of any dynamic filtering
                  information.";
                }
              }
              description
                "containing a control element for each outbound Port,
              specifying that a frame with a destination MAC address,
              and in the case of VLAN Bridge components, VID that
              meets this specification.";
              reference
                "8.8.4 of IEEE Std 802.1Q-2018";

            }
          }  // container mac-address-registration-entries
          container dynamic-vlan-registration-entries {
            description
              "Dynamic VLAN registration entries attributes.";
            leaf control-element {
              type enumeration {
                enum "registered" {
                  value 0;
                  description
                    "Forwarded, independently of any dynamic filtering
                  information held by the FDB.";
                }
              }
              description
                "containing a control element for each outbound Port,
              specifying that a frame with a destination MAC address,
              and in the case of VLAN Bridge components, VID that
              meets this specification.";
              reference
                "8.8.5 of IEEE Std 802.1Q-2018";

            }
          }  // container dynamic-vlan-registration-entries
          container dynamic-reservation-entries {
            description
              "Dynamic reservation entries attributes.";
            leaf control-element {
              type enumeration {
                enum "forward" {
                  value 0;
                  description
                    "Forwarded, independently of any dynamic filtering
                  information held by the FDB.";
                }
                enum "filter" {
                  value 1;
                  description
                    "Filtered, independently of any dynamic filtering
                  information.";
                }
              }
              description
                "Containing a control element for each outbound Port,
              specifying that a frame with a destination MAC address,
              and in the case of VLAN Bridge components, VID that
              meets this specification.";
              reference
                "8.8.7 of IEEE Std 802.1Q-2018";

            }
          }  // container dynamic-reservation-entries
          container dynamic-filtering-entries {
            description
              "Dynamic filtering entries attributes.";
            leaf control-element {
              type enumeration {
                enum "forward" {
                  value 0;
                  description
                    "Forwarded, independently of any dynamic filtering
                  information held by the FDB.";
                }
              }
              description
                "Containing a control element for each outbound Port,
              specifying that a frame with a destination MAC address,
              and in the case of VLAN Bridge components, VID that
              meets this specification.";
              reference
                "8.8.3 of IEEE Std 802.1Q-2018";

            }
          }  // container dynamic-filtering-entries
        }  // choice map-type
      }  // list port-map
    }  // grouping port-map-grouping

    grouping bridge-port-statistics-grouping {
      description
        "Grouping of bridge port statistics.";
      reference
        "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      leaf delay-exceeded-discards {
        type yang:counter64;
        description
          "The number of frames discarded by this port due to excessive
        transit delay through the Bridge. It is incremented by both
        transparent and source route Bridges.";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018
          8.6.6 of IEEE Std 802.1Q-2018";

      }

      leaf mtu-exceeded-discards {
        type yang:counter64;
        description
          "The number of frames discarded by this port due to an
        excessive size. It is incremented by both transparent and
        source route Bridges.";
        reference
          "12.6.1.1.3, item g) of IEEE Std 802.1Q-2018";

      }

      leaf frame-rx {
        type yang:counter64;
        description
          "The number of frames that have been received by this port
        from its segment. Note that a frame received on the interface
        corresponding to this port is only counted by this object if
        and only if it is for a protocol being processed by the local
        bridging function, including Bridge management frames.";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }

      leaf octets-rx {
        type yang:counter64;
        description
          "The total number of octets in all valid frames received
        (including BPDUs, frames addressed to the Bridge as an end
        station, and frames that were submitted to the Forwarding
        Process).";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }

      leaf frame-tx {
        type yang:counter64;
        description
          "The number of frames that have been transmitted by this port
        to its segment. Note that a frame transmitted on the interface
        corresponding to this port is only counted by this object if
        and only if it is for a protocol being processed by the local
        bridging function, including Bridge management frames.";
      }

      leaf octets-tx {
        type yang:counter64;
        description
          "The total number of octets that have been transmitted by this
        port to its segment.";
      }

      leaf discard-inbound {
        type yang:counter64;
        description
          "Count of received valid frames that were discarded (i.e.,
        filtered) by the Forwarding Process.";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }

      leaf forward-outbound {
        type yang:counter64;
        description
          "The number of frames forwarded to the associated MAC Entity
        (8.5).";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }

      leaf discard-lack-of-buffers {
        type yang:counter64;
        description
          "The count of frames that were to be transmitted through the
        associated Port but were discarded due to lack of buffers.";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }

      leaf discard-transit-delay-exceeded {
        type yang:counter64;
        description
          "The number of frames discarded by this port due to excessive
        transit delay through the Bridge. It is incremented by both
        transparent and source route Bridges.";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }

      leaf discard-on-error {
        type yang:counter64;
        description
          "The number of frames that were to be forwarded on the
        associated MAC but could not be transmitted (e.g., frame would
        be too large, 6.5.8).";
        reference
          "12.6.1.1.3 of IEEE Std 802.1Q-2018";

      }
    }  // grouping bridge-port-statistics-grouping
  }  // module ieee802-dot1q-types