module bbf-qos-classifiers {

    yang-version 1.1;

    namespace
      "urn:bbf:yang:bbf-qos-classifiers";

    prefix bbf-qos-cls;

    import ietf-inet-types {
      prefix inet;
    }
    import bbf-yang-types {
      prefix bbf-yang;
    }
    import bbf-dot1q-types {
      prefix bbf-dot1qt;
    }
    import bbf-frame-classification {
      prefix bbf-classif;
    }
    import bbf-qos-types {
      prefix bbf-qos-t;
    }

    organization
      "Broadband Forum <https://www.broadband-forum.org>
Common YANG Work Area";

    contact
      "Comments or questions about this Broadband Forum YANG module
should be directed to <mailto:help@broadband-forum.org>.

Editor:      Nick Hancock, ADTRAN

Editor:      Ludwig Pauwels, Nokia

PS Leader:   Joey Boyd, ADTRAN

WA Director: Joey Boyd, ADTRAN

WA Director: Sven Ooghe, Nokia";

    description
      "This module contains a collection of YANG definitions for
supporting the Broadband Forum requirements on the management of
Quality of Service (QoS) as applicable to access network
equipment. As such, this module is specific to access network
equipment (e.g., BBF-specified Access Nodes and FTTdp DPUs).

Specifically, this module contains a collection of classifiers
that can be used to classify frames and assign actions to be
applied to those frames.

Copyright (c) 2017-2022, Broadband Forum

Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above
   copyright notice, this list of conditions and the following
   disclaimer in the documentation and/or other materials
   provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products
   derived from this software without specific prior written
   permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The above license is used as a license under copyright only.
Please reference the Forum IPR Policy for patent licensing terms
<https://www.broadband-forum.org/ipr-policy>.

Any moral rights which are necessary to exercise under the above
license grant are also deemed granted under this license.

This version of this YANG module is part of TR-383a5; see
the TR itself for full legal notices.";

    revision "2022-03-01" {
      description
        "Amendment 5.
* Approval Date:    2022-03-01.
* Publication Date: 2022-03-01.";
      reference
        "TR-383a5: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-5.pdf>";

    }

    revision "2021-06-02" {
      description
        "Amendment 4.
* Approval Date:    2021-06-02.
* Publication Date: 2021-06-02.";
      reference
        "TR-383a4: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-4.pdf>";

    }

    revision "2020-10-13" {
      description
        "Amendment 3.
* Approval Date:    2020-10-13.
* Publication Date: 2020-10-13.";
      reference
        "TR-383a3: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-3.pdf>";

    }

    revision "2018-07-13" {
      description
        "Amendment 1.
* Approval Date:    2018-06-04.
* Publication Date: see revision date above.";
      reference
        "TR-383: Common YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-383_Amendment-1.pdf>";

    }

    revision "2017-05-08" {
      description
        "Initial revision.
* Approval Date:    see revision date above.
* Publication Date: 2017-06-02.";
      reference
        "TR-383: Common YANG Modules
        	<https://www.broadband-forum.org/technical/download/
        		 TR-383.pdf>";

    }


    feature qos-action-permit {
      description
        "This feature indicates whether the system supports the action
'permit' for frames that are classified using a QoS
classification mechanism.";
    }

    feature qos-configurable-defaults {
      description
        "This feature indicates whether the configuration of QoS default
behaviors is supported.";
    }

    typedef qos-pbit-marking-index {
      type uint8;
      description
        "An index to a Priority Code Point bits (p-bits) marking list.

The marking list is a piece of metadata, i.e. it is data that
belongs to the frame but is not a field of the frame itself.
Once assigned to the frame it travels with the frame until the
frame is transmitted or discarded, this independent of all
frame manipulations that take place. The content of this
marking list is generated via a QoS profile or via a copy from
the frame's pbit in a VLAN sub-interface ingress rewrite. Note
that a frame has just one p-bits marking list, i.e. if multiple
actions write to the same position in the list, then the last
write overwrites the previous.

As an example, it is possible to provide a metadata pbit to a
frame at the ingress side, this data travels with the frame
through the switch, and the metadata is used at the egress side
when a VLAN tag is pushed into the frame.";
    }

    typedef qos-dei-marking-index {
      type uint8;
      description
        "An index to a Drop Eligibility Indicator (DEI) marking list.

The marking list is a piece of metadata, i.e. it is data that
belongs to the frame but is not a field of the frame itself.
Once assigned to the frame it travels with the frame until the
frame is transmitted or discarded, this independent of all
frame manipulations that take place. The content of this
marking list is generated via a QoS profile or via a copy from
the frame's DEI in a VLAN sub-interface ingress rewrite. Note
that a frame has just one DEI marking list, i.e. if multiple
actions write to the same position in the list, then the last
write overwrites the previous.

As an example, it is possible to provide a metadata DEI to a
frame at the ingress side, this data travels with the frame
through the switch, and the metadata is used at the egress side
when a VLAN tag is pushed into the frame.";
    }

    identity classifier-entry-filter-operation-type {
      description
        "Classifier entry filter logical operation.";
    }

    identity match-any-filter {
      base classifier-entry-filter-operation-type;
      description
        "Classifier entry filter logical OR operation.";
    }

    identity match-all-filter {
      base classifier-entry-filter-operation-type;
      description
        "Classifier entry filter logical AND operation.";
    }

    identity action-type {
      description
        "This base identity type defines action-types.";
    }

    identity pbit-marking {
      base action-type;
      description
        "The action-type identity indicating the system shall generate
one or more values for the priority bits (p-bits).";
    }

    identity dei-marking {
      base action-type;
      description
        "The action-type identity indicating the system shall generate
one or more values for the Drop Eligibility Indicator (DEI)
bit.";
    }

    identity scheduling-traffic-class {
      base action-type;
      description
        "The action-type identity indicating a scheduling traffic
class.";
    }

    identity dscp-marking {
      base action-type;
      description
        "The action-type identity indicating the system shall generate
a value for the Differentiated Services Code Point (DSCP)
bits.";
    }

    identity permit {
      base action-type;
      description
        "The action-type identity indicating the permit action. I.e.
frames to which this action is assigned are permitted and will
be subject to the next step of frame processing where further
actions can be assigned.";
    }

    identity action-scope {
      description
        "This base identity type defines action scopes.";
    }

    identity vlan-sub-interface {
      base action-scope;
      description
        "The scope of the action is the VLAN sub-interface.";
    }

    identity ethernet-interface {
      base action-scope;
      description
        "The scope of the action is the Ethernet like interface. This
encompasses all VLAN sub-interfaces within the Ethernet like
interface in scope.";
    }

    typedef action-scope {
      type identityref {
        base action-scope;
      }
      description "The scope of the action.";
    }

    typedef qos-color {
      type enumeration {
        enum "green" {
          value 0;
          description
            "Identifies the green color frame.";
        }
        enum "yellow" {
          value 1;
          description
            "Identifies the yellow color frame.";
        }
        enum "red" {
          value 2;
          description
            "Identifies the red color frame.";
        }
      }
      description
        "Defines a frame color for QoS.";
    }

    grouping pbit-marking {
      description
        "Nodes used to define a list of p-bits metadata.";
      list pbit-marking-list {
        key "index";
        description
          "Creates metadata which can be used to determine p-bits values
to write to a VLAN tag or as match criteria for another
classifier associated with another QoS policy with which the
frame is to be processed. Each entry uses a unique numeric
index associated with a p-bits value.";
        leaf index {
          type qos-pbit-marking-index;
          description
            "The index associated with a p-bits value.";
        }

        leaf pbit-value {
          type bbf-dot1qt:pbit;
          description
            "A p-bits value to be inserted in the p-bits of a frame's
VLAN tag or as match criteria for another classifier
associated with another QoS policy with which the frame is
to be processed.";
        }
      }  // list pbit-marking-list
    }  // grouping pbit-marking

    grouping dei-marking {
      description
        "Nodes used to define a list of DEI metadata.";
      list dei-marking-list {
        key "index";
        description
          "Creates metadata which can be used to determine DEI values to
write to a VLAN tag or as match criteria for another
classifier associated with another QoS policy with which the
frame is to be processed. Each entry uses a unique numeric
index associated with a DEI value.";
        leaf index {
          type qos-dei-marking-index;
          description
            "The index associated with a DEI value.";
        }

        leaf dei-value {
          type bbf-dot1qt:dei;
          description
            "A DEI value to be inserted in the DEI bit of a frame's VLAN
tag or as match criteria for another classifier associated
with another QoS policy with which the frame is to be
processed.";
        }
      }  // list dei-marking-list
    }  // grouping dei-marking

    grouping dscp-marking {
      description "DSCP marking grouping.";
      leaf dscp {
        type inet:dscp;
        description
          "The value to be inserted in the DSCP field in the header of
an IP packet.";
      }
    }  // grouping dscp-marking

    grouping classifier-entry-inline-attr {
      description
        "Classifier inline attributes.";
      container match-criteria {
        status deprecated;
        description
          "Filter operations are performed on all match criteria with
each having a default configuration.

The 'match-all-filter' operation will logically AND each of
the criteria. For example, configuring 'match-all' and
dscp-range to 'any' will match on tagged and untagged frames
that contain a DSCP field and contain any protocol as the
default configuration for the protocol is 'any-protocol'.

The 'match-any-filter' operation will logically OR each of
the configured criteria. For example, configuring 'untagged'
and dscp-range to '10-20' will match on all untagged frames
as well as any IP packet containing a DSCP value of 10 to 20
as well as frames containing any protocol as the default
configuration for the protocol is 'any-protocol'.";
        choice vlan-tag-match-type {
          status deprecated;
          description
            "Provides a choice of how the frames may be matched.

If no case is configured, then it has the same meaning as
if case 'match-all' has been configured.";
          case match-all {
            status deprecated;
            leaf match-all {
              type empty;
              status deprecated;
              description
                "Matches all traffic, i.e; irrespective of the frame
being tagged or untagged.";
            }
          }  // case match-all

          case untagged {
            status deprecated;
            leaf untagged {
              type empty;
              status deprecated;
              description
                "Untagged match. Matches all untagged traffic.";
            }
          }  // case untagged

          case vlan-tagged {
            status deprecated;
            list tag {
              key "index";
              min-elements 1;
              max-elements 2;
              status deprecated;
              description
                "The tags to match, with the outermost tag to match
assigned index 0.";
              leaf index {
                type bbf-classif:tag-index;
                must
                  "count(../../tag[index = 0]) > 0" {
                  error-message
                    "An inner tag can only be matched on when also matching on an outer tag.";
                  description
                    "Only allow matching on an inner tag, if also
matching on the outer tags at the same time.";
                }
                status deprecated;
                description
                  "The index into the tag stack, outermost tag first.";
              }

              leaf in-pbit-list {
                type bbf-dot1qt:pbit-list;
                status deprecated;
                description
                  "Filter containing p-bits value(s) to be matched with
the value of the corresponding frame field. The list
of values form an OR condition: in case the value of
the frame field matches with one of the values of the
leaf then there is a match. In case the leaf
specifies a set of values and none of them appear in
the frame, then there is no match. In case the leaf
specifies a value for a frame field that is not
present, then no frames match the filter. For
example, an untagged frame does not contain p-bits,
hence this frame will not match a specified p-bits
value. In case the leaf is an empty list, or unknown,
then no match is required and all frames classify
the filter, including untagged frames.

An Ethernet frame can contain multiple VLAN tags or
no VLAN tag. The vlan-tag-match-type/vlan-tagged/tag
is a list and the element with index 0 is used to
match with the p-bits of outermost VLAN tag of the
frame, the element with index 1 is used to match with
the p-bits of the second VLAN tag of the frame.";
              }

              leaf in-dei {
                type uint8 {
                  range "0..1";
                }
                status deprecated;
                description
                  "Filter containing DEI bit value(s) to be matched with
the values of the corresponding frame fields. In case
the leaf specifies a value for a frame field that is
not present, then no frames match the filter. For
example, an untagged frame does not contain a DEI
bit, hence this frame will not match a specified DEI
bit value. In case the leaf is unknown, no match is
required and all frames classify the filter,
including untagged frames.

An Ethernet frame can contain multiple VLAN tags or
no VLAN tag. The vlan-tag-match-type/vlan-tagged/tag
is a list and the element with index 0 is used to
match with the DEI bit of the outermost VLAN tag of
the frame, the element with index 1 is used to match
with the DEI bit of the second VLAN tag of the
frame.";
              }
            }  // list tag
          }  // case vlan-tagged
        }  // choice vlan-tag-match-type

        leaf dscp-range {
          type bbf-classif:dscp-range-or-any;
          default "any";
          status deprecated;
          description
            "String identifying the DSCP values and/or range.";
        }

        choice protocols {
          status deprecated;
          description
            "The choice allows to specify combinations of frame field
values that identify a particular protocol or allows to
indicate any protocol.

If no case is configured, then it has the same meaning as
if case 'any-protocol' has been configured.";
          case any-protocol {
            status deprecated;
            leaf any-protocol {
              type empty;
              status deprecated;
              description
                "Identifies any protocol, i.e. not match is specified
for any protocol.";
            }
          }  // case any-protocol

          case protocol {
            status deprecated;
            leaf-list protocol {
              type bbf-classif:protocols;
              status deprecated;
              description
                "Defines the protocols which will be matched.";
            }
          }  // case protocol
        }  // choice protocols
      }  // container match-criteria
    }  // grouping classifier-entry-inline-attr

    grouping classifier-action-entry-cfg {
      description
        "List of actions to be applied to a classified set of frames.";
      list classifier-action-entry-cfg {
        key "action-type";
        ordered-by user;
        description
          "Configuration of classifier associated actions.";
        leaf action-type {
          type identityref {
            base action-type;
          }
          description
            "This defines the action type.";
        }

        choice action-cfg-params {
          description
            "Choice of action types.";
          container pbit-marking-cfg {
            when
              "../action-type='bbf-qos-cls:pbit-marking'" {
              description
                "Only applicable when the action-type is
'pbit-marking'.";
            }
            description
              "P-bits marking configuration container.";
            uses pbit-marking;
          }  // container pbit-marking-cfg
          container dei-marking-cfg {
            when
              "../action-type='bbf-qos-cls:dei-marking'" {
              description
                "Only applicable when the action-type is
dei-marking.";
            }
            description
              "DEI marking configuration container.";
            uses dei-marking;
          }  // container dei-marking-cfg
          container dscp-marking-cfg {
            when
              "../action-type='bbf-qos-cls:dscp-marking'" {
              description
                "Only applicable when the action-type is
dscp-marking.";
            }
            description
              "DSCP marking configuration container.";
            uses dscp-marking;
          }  // container dscp-marking-cfg
          leaf scheduling-traffic-class {
            when
              "../action-type=
'bbf-qos-cls:scheduling-traffic-class'" {
              description
                "Only applicable when the action-type is
scheduling-traffic-class.";
            }
            type bbf-qos-t:traffic-class-id;
            description
              "Defines the traffic class for scheduling.";
          }

          case permit {
            if-feature bbf-qos-cls:qos-action-permit;
            description
              "The action type for frames matching a classification
criterion is that they are permitted and will be subject
to further processing.";
            leaf permit {
              when
                "../bbf-qos-cls:action-type="bbf-qos-cls:permit"" {
                description
                  "Only applicable when the action-type is 'permit'.";
              }
              type empty;
              description
                "The action type for frames matching a classification
criterion is 'permit'.";
            }
          }  // case permit
        }  // choice action-cfg-params
      }  // list classifier-action-entry-cfg
    }  // grouping classifier-action-entry-cfg

    container classifiers {
      description
        "Provides data nodes that allow to manage methods to classify
frames and assign actions in the context of QoS.";
      container system-default-actions {
        config false;
        description
          "Reports the set of system defaults that apply when the
application of QoS policies does not generate such data, but
the processing of a frame requires this data.

When a frame is received or to be transmitted on an
interface, then it can be subject to QoS policies that are
configured for this interface. The definition of QoS policies
includes the assignment of metadata to frames which can then
be used during the further processing of the frame.

An example is the assignment of a traffic class. This traffic
class is used, after the forwarding decision has been made
and all QOS polices are applied, to identify the queue on the
outgoing interface. If a traffic class is not explicitly
configured, a default must be used for each matched ingress
frame. This value is reported in 'scheduling-traffic-class'.

And similar for the other data nodes.";
        leaf scheduling-traffic-class {
          type union {
            type bbf-qos-t:traffic-class-id;
            type enumeration {
              enum "discard" {
                value 0;
                description
                  "The traffic class 'discard' means that frames will
not get a traffic class by default. When the
processing of the frame comes to a moment that a
traffic class is needed, and none is assigned through
having applied the QoS profiles, then the system
shall discard the frame.";
              }
            }
          }
          description
            "Defines the traffic class assigned by default to frames.";
        }

        leaf flow-color {
          type union {
            type qos-color;
            type enumeration {
              enum "discard" {
                value 0;
                description
                  "The flow color 'discard' means that frames will not
get a flow color by default. When the processing of
the frame comes to a moment that a flow color is
needed, and none is assigned through having applied
the QoS profiles, then the system shall discard the
frame.";
              }
            }
          }
          description
            "Defines the frame's flow color for when color-aware
classification and/or actions are needed in the processing
of a frame.";
        }

        leaf bac-color {
          type union {
            type qos-color;
            type enumeration {
              enum "discard" {
                value 0;
                description
                  "The BAC color 'discard' means that frames will not
get a BAC color by default. When the processing of
the frame comes to a moment that a BAC color is
needed, and none is assigned through having applied
the QoS profiles, then the system shall discard the
frame.";
              }
            }
          }
          description
            "Defines the frame's BAC color for when color-aware
classification and/or actions are needed in the processing
of a frame. More specific, when the frame is to be queued
using a color aware BAC method.";
        }
      }  // container system-default-actions

      container configurable-default-actions {
        if-feature qos-configurable-defaults;
        description
          "Defines data nodes that allow to configure the default
behavior for when the processing of a frame requires data,
and the former applying of QoS policies did not generate such
data. The configured defaults overrule the system defaults
provide in the container 'system-default-actions'.

More in detail, when a frame is received or to be
transmitted on an interface, then it can be subject to QoS
policies that are configured for this interface. The
definition of QoS policies includes the assignment of
metadata to frames which can then be used during the
further processing of the frame.

An example is the assignment of a traffic class. This traffic
class is used, after the forwarding decision has been made
and all QOS polices are applied, to identify the queue on the
outgoing interface. If a traffic class is not explicitly
configured, a default must be used for each matched ingress
frame. This value is configured in
'scheduling-traffic-class'.

And similar for the other data nodes.";
        leaf scheduling-traffic-class {
          type union {
            type bbf-qos-t:traffic-class-id;
            type enumeration {
              enum "discard" {
                value 0;
                description
                  "The traffic class 'discard' means that frames will
not get a traffic class by default. When the
processing of the frame comes to a moment that a
traffic class is needed, and none is assigned through
having applied the QoS profiles, then the system
shall discard the frame.";
              }
            }
          }
          description
            "Defines the traffic class assigned by default to frames.";
        }

        leaf flow-color {
          type union {
            type qos-color;
            type enumeration {
              enum "discard" {
                value 0;
                description
                  "The flow color 'discard' means that frames will not
get a flow color by default. When the processing of
the frame comes to a moment that a flow color is
needed, and none is assigned through having applied
the QoS profiles, then the system shall discard the
frame.";
              }
            }
          }
          description
            "Defines the frame's flow color for when color-aware
classification and/or actions are needed in the processing
of a frame.";
        }

        leaf bac-color {
          type union {
            type qos-color;
            type enumeration {
              enum "discard" {
                value 0;
                description
                  "The BAC color 'discard' means that frames will not
get a BAC color by default. When the processing of
the frame comes to a moment that a BAC color is
needed, and none is assigned through having applied
the QoS profiles, then the system shall discard the
frame.";
              }
            }
          }
          description
            "Defines the frame's BAC color for when color-aware
classification and/or actions are needed in the processing
of a frame. More specific, when the frame is to be queued
using a color aware BAC method.";
        }
      }  // container configurable-default-actions

      list classifier-entry {
        key "name";
        description
          "Classifier entry template.";
        leaf name {
          type bbf-yang:string-ascii64;
          description "Classifier name.";
        }

        leaf description {
          type bbf-yang:string-ascii64-or-empty;
          description
            "Description of the class template.";
        }

        leaf filter-operation {
          type identityref {
            base classifier-entry-filter-operation-type;
          }
          default
            "bbf-qos-cls:match-any-filter";
          status deprecated;
          description
            "Filters are applicable as any or all filters.";
        }

        choice filter-method {
          description
            "Configuration of filter methods.";
          case inline {
            description
              "The classifier criteria are directly configured here.";
            uses classifier-entry-inline-attr {
              status deprecated;
            }
          }  // case inline

          case all-packets {
            description
              "The classifier applies to all frames that are in the
scope of the flow on which the classifier applies.";
            leaf all-packets {
              type empty;
              description
                "Identifies all frames.";
            }
          }  // case all-packets
        }  // choice filter-method

        uses classifier-action-entry-cfg;
      }  // list classifier-entry
    }  // container classifiers

    grouping classifier-entry-ref {
      description
        "A reference to a classifier entry.";
      leaf name {
        type leafref {
          path
            "/bbf-qos-cls:classifiers/bbf-qos-cls:classifier-entry/bbf-qos-cls:name";
        }
        description
          "The name of the referenced classifier entry.";
      }
    }  // grouping classifier-entry-ref

    grouping in-pbit-list {
      description
        "Ingress Priority Bits (p-bits) configuration.";
      leaf in-pbit-list {
        type bbf-dot1qt:pbit-list;
        description
          "Filter containing p-bits value(s) to be matched with the
value of the corresponding frame field. The list of values
form an OR condition: in case the value of the frame field
matches with one of the values of the leaf then there is a
match. In case the leaf specifies a set of values and none of
them appear in the frame, then there is no match. In case
the leaf specifies a value for a frame field that is not
present, then no frames match the filter. E.g. an untagged
frame does not contain p-bits, hence this frame will not
match a specified p-bits value. In case the leaf is an empty
list, or unknown, then no match is required and all frames
classify the filter, including untagged frames.

An Ethernet frame can contain multiple VLAN tags or no VLAN
tag. The vlan-tag-match-type/vlan-tagged/tag is a list and
the element with index 0 is used to match with the p-bits of
outermost VLAN tag of the frame, the element with index 1 is
used to match with the p-bits of the second VLAN tag of the
frame.";
      }
    }  // grouping in-pbit-list

    grouping in-dei {
      description
        "Ingress Drop Eligible Indicator (DEI) configuration.";
      leaf in-dei {
        type uint8 {
          range "0..1";
        }
        description
          "Filter containing DEI bit value(s) to be matched with the
values of the corresponding frame fields. In case the leaf
specifies a value for a frame field that is not present, then
no frames match the filter. E.g. an untagged frame does not
contain a DEI bit, hence this frame will not match a
specified DEI bit value. In case the leaf is unknown, no
match is required and all frames classify the filter,
including untagged frames.

An Ethernet frame can contain multiple VLAN tags or no VLAN
tag. The vlan-tag-match-type/vlan-tagged/tag is a list and
the element with index 0 is used to match with the DEI bit of
the outermost VLAN tag of the frame, the element with index
1 is used to match with the DEI bit of the second VLAN tag of
the frame.";
      }
    }  // grouping in-dei
  }  // module bbf-qos-classifiers