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;
    }
    import bbf-frame-processing-types {
      prefix bbf-fpt;
    }

    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) 2017-2023, 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-383a6; see
the TR itself for full legal notices.";

    revision "2023-03-07" {
      description
        "Amendment 6.
* Approval Date:    2023-03-07.
* Publication Date: 2023-03-07.";
      reference
        "TR-383a6: Common YANG Modules
        	  <https://www.broadband-forum.org/technical/download/
        		   TR-383_Amendment-6.pdf>";

    }

    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.";
    }

    feature preserve-pbit-dei-from-frame-to-metadata {
      description
        "Indicates support for preserving p-bits and DEI fields from the
frame into metadata.";
    }

    feature qos-bac-color-from-flow-color {
      description
        "Indicates support for copying the flow color into the buffer
acceptance control (BAC) color.";
    }

    typedef qos-pbit-marking-index {
      type bbf-fpt:qos-pbit-marking-index;
      status deprecated;
      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 bbf-fpt:qos-dei-marking-index;
      status deprecated;
      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.";
    }

    typedef write-bac-color {
      type union {
        type bbf-qos-t:qos-color;
        type enumeration {
          enum "copy-from-flow-color" {
            value 0;
            description
              "The BAC color of a frames is the same as its flow
color.";
          }
        }
      }
      description
        "The BAC color to be written. Either this is a specific BAC
color value, or it indicates where to take the BAC color
from.";
    }

    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 bbf-qos-t:qos-color;
      status deprecated;
      description
        "Defines a frame color for QoS.";
    }

    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 bbf-qos-t: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 write-bac-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 bbf-qos-t: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 write-bac-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.";
            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-fpt: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 value(s) of the p-bits 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 value of
the p-bits. In case the leaf 'in-pbit-list' is an
empty list, or is not configured, 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 not configured, 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

              list pbit-marking-list {
                key "index";
                status deprecated;
                description
                  "Match on metadata created as the output of another
classifier. This metadata consists of a value of the p-bits
associated with a numeric index.";
                leaf index {
                  type bbf-fpt:qos-pbit-marking-index;
                  status deprecated;
                  description
                    "The index associated with a value of the p-bits.";
                }

                leaf pbit-value {
                  type bbf-dot1qt:pbit;
                  status deprecated;
                  description
                    "A value of the p-bits to be used as match criteria from the
output of another classifier associated with the same QoS
policy.";
                }
              }  // list pbit-marking-list

              list dei-marking-list {
                key "index";
                status deprecated;
                description
                  "Match on metadata created as the output of another
classifier. This metadata consists of a DEI value associated
with a numeric index.";
                leaf index {
                  type bbf-fpt:qos-dei-marking-index;
                  status deprecated;
                  description
                    "The index associated with a DEI value.";
                }

                leaf dei-value {
                  type bbf-dot1qt:dei;
                  status deprecated;
                  description
                    "A DEI value to be used as match criteria from the output of
another classifier associated with the same QoS policy.";
                }
              }  // list dei-marking-list

              leaf-list flow-color {
                type bbf-qos-t:qos-color;
                status deprecated;
                description
                  "Defines the frame color as a classification criterion for
assigning frames to a flow.";
              }
            }  // container match-criteria
          }  // 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

          case by-reference {
            description
              "The classifier criteria are configured in a separate list.";
            list filter {
              key "name";
              description
                "Filters to be matched.";
              leaf name {
                type bbf-yang:string-ascii64;
                description
                  "Name of the filter.";
              }

              leaf filter-name {
                type leafref {
                  path "/bbf-qos-filt:filters/bbf-qos-filt:filter/bbf-qos-filt:name";
                }
                description
                  "A reference to a filter.";
              }
            }  // list filter
          }  // case by-reference
        }  // choice filter-method

        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.";
              list pbit-marking-list {
                key "index";
                description
                  "Creates metadata which can be used to determine values of
the p-bits 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 value of the p-bits.";
                leaf index {
                  type bbf-fpt:qos-pbit-marking-index;
                  description
                    "The index associated with a value of the p-bits.";
                }

                leaf pbit-value {
                  type bbf-dot1qt:pbit;
                  description
                    "A value of the p-bits 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.";
                }

                leaf pbit-from-frame-tag {
                  if-feature preserve-pbit-dei-from-frame-to-metadata;
                  type bbf-fpt:tag-index;
                  must
                    "not(boolean(../pbit-value))" {
                    error-message
                      "The leaf 'pbit-from-frame-tag' cannot be configured when the leaf 'pbit-value' is configured.";
                    description
                      "Ensure that the leaf 'pbit-value' is not present when the
leaf 'pbit-from-frame-tag' is present, and vice versa.";
                  }
                  description
                    "Indicates that frames will get a metadata value of the
p-bits by copying a value of the p-bits from a frame's
VLAN tag. The VLAN tag from which to copy the value of the
p-bits is identified by the value of this leaf.";
                }
              }  // list pbit-marking-list
            }  // 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.";
              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 bbf-fpt: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.";
                }

                leaf dei-from-frame-tag {
                  if-feature preserve-pbit-dei-from-frame-to-metadata;
                  type bbf-fpt:tag-index;
                  must
                    "not(boolean(../dei-value))" {
                    error-message
                      "The leaf 'dei-from-frame-tag' cannot be configured when the leaf 'dei-value' is configured.";
                    description
                      "Ensure that the leaf 'dei-value' is not present when the
leaf 'dei-from-frame-tag' is present, and vice versa.";
                  }
                  description
                    "Indicates that frames will get a metadata DEI value by
copying a DEI value from a frame's VLAN tag. The VLAN tag
from which to copy the DEI value is identified by the value
of this leaf.";
                }
              }  // list dei-marking-list
            }  // 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.";
              leaf dscp {
                type inet:dscp;
                description
                  "The value to be inserted in the DSCP field in the header of
an IP packet.";
              }
            }  // 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
            leaf flow-color {
              when
                "../bbf-qos-cls:action-type="bbf-qos-plc:flow-color"" {
                description
                  "Only applicable when the action-type is flow-color.";
              }
              type bbf-qos-t:qos-color;
              description
                "Defines the frame color for when color-aware
classification/actions is needed in a proceeding QoS
policy.";
            }
            leaf bac-color {
              when
                "../bbf-qos-cls:action-type="bbf-qos-plc:bac-color"" {
                description
                  "Only applicable when the action-type is bac-color.";
              }
              type write-bac-color;
              description
                "Defines the frame color for color aware BAC queuing.";
            }
            leaf discard {
              when
                "../bbf-qos-cls:action-type="bbf-qos-plc:discard"" {
                description
                  "Only applicable when the action-type is discard.";
              }
              type empty;
              description
                "Defines the action discard frames for a flow.";
            }
            container policing {
              when
                "../bbf-qos-cls:action-type="bbf-qos-plc:policing"" {
                description
                  "Only applicable when the action-type is policing.";
              }
              description
                "Defines a policing function shall be applied to a flow.";
              leaf policing-profile {
                type leafref {
                  path "/bbf-qos-plc:policing-profiles/bbf-qos-plc:policing-profile/bbf-qos-plc:name";
                }
                description
                  "The name of the referenced policing profile.";
              }
            }  // container policing

            case envelope-policing {
              description
                "The set of actions is extended with a possibility to
associate a policer flow.";
              container policer-envelope-flow {
                description
                  "Nodes used to uniquely identify a policer flow associated
with an envelope.";
                leaf envelope {
                  type leafref {
                    path "/bbf-qos-plc-ep:envelope-profiles/bbf-qos-plc-ep:envelope-profile/bbf-qos-plc-ep:name";
                  }
                  description
                    "A reference to a policer envelope profile.";
                }

                leaf flow {
                  type leafref {
                    path "/bbf-qos-plc-ep:envelope-profiles/bbf-qos-plc-ep:envelope-profile[bbf-qos-plc-ep:name=current()/../envelope]/bbf-qos-plc-ep:flows/bbf-qos-plc-ep:flow/bbf-qos-plc-ep:rank";
                  }
                  description
                    "A reference to a policer flow within an envelope.";
                }
              }  // container policer-envelope-flow
            }  // case envelope-policing

            case rate-limit-frames {
              description
                "The set of actions is extended with a possibility to rate
limit the number of frames that match a classification. The
rate limit specifies a limit for the number of frames.
Frames that exceed this limit are discarded.";
              container rate-limit-frames {
                when
                  "../bbf-qos-cls:action-type=
'bbf-qos-rc:rate-limit-frames'" {
                  description
                    "Only applicable when the action-type is
rate-limit-frames.";
                }
                description
                  "The set of leaves that specify the allowed rate.";
                leaf rate {
                  type uint32;
                  units "frames per second";
                  description
                    "Limits the number of frames per second to this number.";
                }

                leaf burst-size {
                  type uint32;
                  units "frames";
                  description
                    "The burst-size together with the frame-rate define a
mechanism to control a frame rate.";
                }
              }  // container rate-limit-frames
            }  // case rate-limit-frames
          }  // choice action-cfg-params
        }  // list classifier-action-entry-cfg
      }  // list classifier-entry
    }  // container classifiers
  }  // module bbf-qos-classifiers