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module bgp-multiprotocol {
    yang-version 1;
    namespace "urn:opendaylight:params:xml:ns:yang:bgp-multiprotocol";
    prefix "bgp-mp";

    import bgp-message { prefix bgp-msg; revision-date 2020-01-20; }
    import bgp-types { prefix bgp-t; revision-date 2020-01-20; }
    import yang-ext { prefix ext; revision-date 2013-07-09; }
    import ietf-routing-types { prefix rt-types; }

    organization "Cisco Systems, Inc.";
    contact "Dana Kutenicsova ";

    description
        "This module contains the base data model of a BGP message.
        It rolls up the definitions contained in RFC4271
        and draft-ietf-idr-ls-distribution-03.

        Copyright (c)2013 Cisco Systems, Inc. All rights reserved.

        This program and the accompanying materials are made available
        under the terms of the Eclipse Public License v1.0 which
        accompanies this distribution, and is available at
        http://www.eclipse.org/legal/epl-v10.html";

    revision "2018-03-29" {
        description "Add RFC6514 Extended communities under bgp type.";
    }

    revision "2017-12-07" {
        description "Add support for add-path in base BGP NLRI.";
    }

    revision "2013-09-19" {
        description
            "Split off basic types";
    }

    revision "2013-09-18" {
        description
            "Initial revision.";
        reference "RFC4760";
    }

    typedef send-receive {
        type enumeration {
            enum receive { value 1; }
            enum send { value 2; }
            enum both { value 3; }
        }
    }

    grouping bgp-table-type {
        leaf afi {
            type identityref {
                base bgp-t:address-family;
            }
        }
        leaf safi {
            type identityref {
                base bgp-t:subsequent-address-family;
            }
        }
    }

    grouping bgp-add-path-table-type {
        uses bgp-table-type;
        leaf send-receive {
            type send-receive;
        }
    }

    grouping destination {
        choice destination-type {
            // to be augmented
        }
    }

    grouping mp-capabilities {
        container multiprotocol-capability {
            reference "http://tools.ietf.org/html/rfc4760#section-8";
            uses bgp-table-type;
        }
        container graceful-restart-capability {
            presence "indicates a graceful restart capability";

            reference "http://tools.ietf.org/html/rfc4724#section-3";

            leaf restart-flags {
                type bits {
                    bit restart-state {
                        position 0;
                        }
                    }
                mandatory true;
            }

            leaf restart-time {
                type uint16 {
                    range 0..4095;
                }
                units seconds;
                default 0;
            }

            list tables {
                uses bgp-table-type;
                key "afi safi";

                leaf afi-flags {
                    type bits {
                        bit forwarding-state {
                            position 0;
                        }
                    }
                    mandatory true;
                }
            }
        }
        container ll-graceful-restart-capability {
            reference "https://tools.ietf.org/html/draft-uttaro-idr-bgp-persistence-04";

            list tables {
                uses bgp-table-type;
                key "afi safi";

                leaf afi-flags {
                    type bits {
                        bit forwarding-state {
                            position 0;
                        }
                    }
                    mandatory true;
                }
                leaf long-lived-stale-time {
                    type rt-types:uint24;
                    units seconds;
                    default 0;
                }
            }
        }
        container add-path-capability {
            reference "http://tools.ietf.org/html/draft-ietf-idr-add-paths-13#section-4";
            list address-families {
                uses bgp-add-path-table-type;
            }
        }
        container route-refresh-capability {
            presence "Route refresh capability";
            reference "http://tools.ietf.org/html/rfc2918";
        }
    }

    augment "/bgp-msg:open/bgp-msg:bgp-parameters/bgp-msg:optional-capabilities/bgp-msg:c-parameters" {
        uses mp-capabilities;
    }

    augment "/bgp-msg:update/bgp-msg:attributes" {
        ext:augment-identifier attributes-reach;
        container mp-reach-nlri {
            reference "http://tools.ietf.org/html/rfc4760#section-3";

            uses bgp-table-type;
            uses bgp-t:next-hop;

            container advertized-routes {
                uses destination;
            }
        }
    }

    augment "/bgp-msg:update/bgp-msg:attributes" {
        ext:augment-identifier attributes-unreach;
        container mp-unreach-nlri {
            reference "http://tools.ietf.org/html/rfc4760#section-4";

            uses bgp-table-type;

            container withdrawn-routes {
                uses destination;
            }
        }
    }

    notification route-refresh {
        description "ROUTE-REFRESH message";
        reference "https://tools.ietf.org/html/rfc2918#section-3";
        uses bgp-table-type;
    }
}