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BIER WG                                                     Zheng. Zhang
Internet-Draft                                                 Cui. Wang
Intended status: Standards Track                               Ran. Chen
Expires: October 30, 2017                                    Fangwei. Hu
                                                         ZTE Corporation
                                                       Mahesh. Sivakumar
                                                     Cisco Systems, Inc.
                                                          April 28, 2017


                          BIER TE YANG module
                      draft-zhang-bier-te-yang-03

Abstract

   This document defines a YANG data model for BIER TE configuration and
   operation.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 30, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Design of the Data Model  . . . . . . . . . . . . . . . . . .   2
   3.  BIER-TE configuration . . . . . . . . . . . . . . . . . . . .   5
   4.  Notifications . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  BIER TE YANG module . . . . . . . . . . . . . . . . . . . . .   5
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   [I-D.eckert-bier-te-arch] introduces an architecture for BIER-TE:
   Traffic Engineering for Bit Index Explicit Replication (BIER).  This
   document defines a YANG data model for BIER TE.  The content is in
   keeping with the TE architecture draft.

2.  Design of the Data Model

   Instead of using respective sub-domain-id, si and bsl information
   like in BIER yang draft [I-D.ietf-bier-bier-yang], this document
   tries to group these sub-domain-id, si and bsl information in a new
   bier-common grouping to simplify the reference.  Later yang modules
   may import the common grouping easily.  Further, if this optimization
   is recognized, then BIER yang draft [I-D.ietf-bier-bier-yang] will be
   updated to group these sub-domain-id, si and bsl information as well.

          module: ietf-bier-te
            augment /rt:routing:
              +--rw bier-te-config
                 +--rw te-subdomain* [subdomain-id]
                    +--rw subdomain-id    bier:sub-domain-id
                    +--rw adj-id* [adjID]
                    |  +--rw adjID     adjid
                    |  +--rw adj-if    uint32
                    |  +--rw (te-adjID-type)
                    |     +--:(p2p)
                    |     +--:(bfer)
                    |     +--:(leaf-bfer)
                    |     +--:(lan)
                    |     +--:(spoke)
                    |     +--:(ring-clockwise)
                    |     +--:(ring-counterclockwise)
                    |     +--:(ecmp)
                    |     +--:(virtual-link)



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                    |     +--:(other)
                    +--rw te-bsl* [fwd-bsl]
                    |  +--rw fwd-bsl    uint16
                    |  +--rw te-si* [si]
                    |     +--rw si            bier:si
                    |     +--rw ft-label?     rt-types:mpls-label
                    |     +--rw te-f-index* [te-f-index]
                    |        +--rw te-f-index    bit-string
                    |        +--rw (te-adj-type)
                    |        |  +--:(connected)
                    |        |  +--:(routed)
                    |        |  +--:(local-decap)
                    |        |  +--:(ecmp)
                    |        |  +--:(other)
                    |        +--rw f-bm          bit-string
                    |        +--rw f-intf        uint32
                    |        +--rw ecmp?         boolean
                    |        +--rw ecmp-index?   uint16
                    |        +--rw frr?          boolean
                    +--rw ecmp-path* [index]
                    |  +--rw index     uint32
                    |  +--rw number* [number]
                    |     +--rw number    uint16
                    |     +--rw out-if    uint32
                    +--rw btaft* [adj-index]
                       +--rw adj-index       uint32
                       +--rw bitposition     bit-string
                       +--rw resetbitmask    bit-string
                       +--rw addbitmask      bit-string
            augment /rt:routing-state:
              +--ro bier-te-state
                 +--ro te-subdomain* [subdomain-id]
                    +--ro subdomain-id    bier:sub-domain-id
                    +--ro adj-id* [adjID]
                    |  +--ro adjID     adjid
                    |  +--ro adj-if    uint32
                    |  +--ro (te-adjID-type)
                    |     +--:(p2p)
                    |     +--:(bfer)
                    |     +--:(leaf-bfer)
                    |     +--:(lan)
                    |     +--:(spoke)
                    |     +--:(ring-clockwise)
                    |     +--:(ring-counterclockwise)
                    |     +--:(ecmp)
                    |     +--:(virtual-link)
                    |     +--:(other)
                    +--ro te-bsl* [fwd-bsl]



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                    |  +--ro fwd-bsl    uint16
                    |  +--ro te-si* [si]
                    |     +--ro si            bier:si
                    |     +--ro ft-label?     rt-types:mpls-label
                    |     +--ro te-f-index* [te-f-index]
                    |        +--ro te-f-index    bit-string
                    |        +--ro (te-adj-type)
                    |        |  +--:(connected)
                    |        |  +--:(routed)
                    |        |  +--:(local-decap)
                    |        |  +--:(ecmp)
                    |        |  +--:(other)
                    |        +--ro f-bm          bit-string
                    |        +--ro f-intf        uint32
                    |        +--ro ecmp?         boolean
                    |        +--ro ecmp-index?   uint16
                    |        +--ro frr?          boolean
                    +--ro ecmp-path* [index]
                    |  +--ro index     uint32
                    |  +--ro number* [number]
                    |     +--ro number    uint16
                    |     +--ro out-if    uint32
                    +--ro btaft* [adj-index]
                       +--ro adj-index       uint32
                       +--ro bitposition     bit-string
                       +--ro resetbitmask    bit-string
                       +--ro addbitmask      bit-string

            notifications:
              +---n bier-te-notification
                 +--ro adjID-is-zero* [if-index]
                    +--ro if-index    uint32
                    +--ro (te-adjID-type)
                       +--:(p2p)
                       +--:(bfer)
                       +--:(leaf-bfer)
                       +--:(lan)
                       +--:(spoke)
                       +--:(ring-clockwise)
                       +--:(ring-counterclockwise)
                       +--:(ecmp)
                       +--:(virtual-link)
                       +--:(other)








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3.  BIER-TE configuration

   The BIER-TE information is indexed by the sub-domain ID.  Maybe there
   are some global BIER-TE information, it should be added in later
   version.

   One interface can be used in different sub-domain, so the BIER TE
   adjacency information is managed by BIER TE other than by interface.

   Because the BIER-TE is controlled by controller now, the information
   about IGP is not defined.  If in the future the IGP is used to carry
   the information about BIER-TE, the IGP extension will be added in
   this document.

4.  Notifications

   If the adjacency id of one adjacency is set to zero, the value is
   invalid.  The notification should be sent to controller and network
   manager.

5.  BIER TE YANG module

<CODE BEGINS> file "ietf-bier-te.yang"

   module ietf-bier-te {

    namespace "urn:ietf:params:xml:ns:yang:ietf-bier-te";

    prefix bier-te;

    import ietf-routing {
        prefix "rt";
    }

    import ietf-bier {
        prefix "bier";
    }

    import ietf-routing-types {
        prefix "rt-types";
    }

    organization " IETF BIER(Bit Indexed Explicit Replication ) Working Group";
    contact
        "WG List:  <mailto:bier@ietf.org>
         WG Chair: Tony Przygienda
                   <mailto:tonysietf@gmail.com>
         WG Chair: Greg Shepherd



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                   <mailto:gjshep@gmail.com>

         Editor:   Zheng Zhang
                   <mailto:zhang.zheng@zte.com.cn>
         Editor:   Cui Wang
                   <mailto:wang.cui1@zte.com.cn>
         Editor:   Ran Chen
                   <mailto:chen.ran@zte.com.cn>
         Editor:   Fangwei Hu
                   <mailto:hu.fangwei@zte.com.cn>
         Editor:   Mahesh Sivakumar
                   <mailto:masivaku@cisco.com>
        ";

    description
        "This module contains a collection of YANG definitions for
         managing BIER TE information.";

    revision 2017-04-26 {
        description
        "Add label for forwading table.";
        reference "https://tools.ietf.org/html/draft-zhang-bier-te-yang";
    }

    revision 2016-10-13 {
        description
        "Add reference of BIER common structure.";
        reference "https://tools.ietf.org/html/draft-zhang-bier-te-yang";
    }

    revision 2016-03-01 {
        description
        "Initial version.";
        reference "https://tools.ietf.org/html/draft-zhang-bier-te-yang";
    }

    /*
    * Features
    */
    feature bier-te-frr {
        description
            "Support ECMP feature in BIER TE.";
    }

    grouping te-frr {
        description "The TE fast reroute information.";
        list btaft {
            key "adj-index";



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            description "The adjacency index of the frr paths.";
            leaf adj-index {
                type uint32;
                mandatory true;
                description "The frr adjacency index.";
            }
            leaf bitposition {
                type bit-string;
                mandatory true;
                description "The bitposition information.";
            }
            leaf resetbitmask {
                type bit-string;
                mandatory true;
                description "The deleting bitmask of the forwarding item.";
            }
            leaf addbitmask {
                type bit-string;
                mandatory true;
                description "The adding bitmask of the forwarding item.";
            }
        }
    }

    grouping te-adj-type {
        description "The collection of all possible adjacency type.";
        choice te-adj-type {
            mandatory true;
            case connected {
                description "The type of adjacency is connected. Mostly connected interfaces.";
                        }
            case routed {
                description "The type of adjacency is routed. Mostly not connected interfaces.";
            }
            case local-decap {
                description "Means that the packet should be decapsulated and forward out BIER domain.";
            }
            case ecmp {
                description "There is more than one path in the adjacency with equal cost.";
            }
            case other {
                description "Means that the packet should be discarded.";
            }
            description "The collection of all possible adjacency type.";
        }
    }

    grouping te-adjID-type {



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        description "The collection of all possible adjacency type.";
        choice te-adjID-type {
            mandatory true;
            case p2p {
                description "Describes p2p adjacency.";
            }
            case bfer {
                description "Describes bfer adjacency.";
            }
            case leaf-bfer {
                description "Describes leaf-bfer adjacency. There is no next BFR that the packet should be forwarded.";
            }
            case lan {
                description "Describes lan adjacency..";
            }
            case spoke {
                description "Describes spoke adjacency of hub-and-spoke.";
            }
            case ring-clockwise {
                description "Describes clockwise adjacency in ring.";
            }
            case ring-counterclockwise {
                description "Describes counterclockwise adjacency in ring.";
            }
            case ecmp {
                description "Describes  ecmp adjacency.";
            }
            case virtual-link {
                description "Describes virtual adjacency between two indirect connect nodes.";
            }
            case other {
                description "Describes other id type of adjacency.";
            }
            description "The collection of all possible adjacency type.";
        }
    }

    typedef adjid {
        type uint32;
        description "The type for adjacency ID.";
    }

    typedef bit-string {
        type uint16;
        description "The bit mask of one bitstring.";
    }

    grouping te-adjID {



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        list adj-id {
            key "adjID";
            description "This ID information of one adjacency.";
            leaf adjID {
                type adjid;
                mandatory true;
                description "The adjacency id.";
            }
            leaf adj-if {
                /* type if:if-index; */
                type uint32;  /* for compilation */
                mandatory true;
                description "The corresponding interface of this adjacency.";
            }
            uses te-adjID-type;
        }
        description "This group presents adjacency ID information for BIER TE.";
    }

    grouping te-ecmp {
        description "The ecmp information.";
        list ecmp-path {
            key "index";
            description "The index of the ecmp paths.";
            leaf index {
                type uint32;
                mandatory true;
                description "The ecmp index.";
            }
            list number {
                key "number";
                description "The list of the ecmp paths.";
                leaf number {
                    type uint16;
                    mandatory true;
                    description "The number of the ecmp paths.";
                }
                leaf out-if {
                    /* type if:if-index; */
                    type uint32; /* for compilation */
                    mandatory true;
                    description "The outgoing interface.";
                }
            }
        }
    }

    grouping te-items {



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        description "The BIER TE forwarding items collection.";
        uses te-adj-type;
        leaf f-bm {
            type bit-string;
            mandatory true;
            description "The bitmask of the forwarding item.";
        }
        leaf f-intf {
            /* type if:if-index; */
            type uint32; /* for compilation */
            mandatory true;
            description "The out interface of this forwarding item.";
        }
        leaf ecmp {
            type boolean;
            description "The capibility of ecmp paths.";
        }
        leaf ecmp-index {
            type uint16;
            description "The index of ecmp path.";
        }
        leaf frr {
            type boolean;
            description "The capibility of fast re-route.";
        }
    }

    grouping te-fwd-item {
        list te-si {
            key "si";
            description "The forwarding items of one set identifier.";
            leaf si{
                type bier:si;
                mandatory true;
                description "The set identifier of this forwarding item.";
            }
            leaf ft-label {
                type rt-types:mpls-label;
                description "The label of forwarding table.";
            }
            list te-f-index {
                key "te-f-index";
                description "The forwarding information of one BIER TE item.";
                leaf te-f-index {
                    type bit-string;
                    mandatory true;
                    description "The bit index of BIER TE forwarding item.";
                }



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                uses te-items;
            }
        }
        description "The forwarding items in one set identifier.";
    }

    grouping te-info {
        description "The BIER TE forwarding information.";
        list te-subdomain {
            key "subdomain-id";
            description "The forwarding items of one sub-domain.";
            leaf subdomain-id {
                type bier:sub-domain-id;
                description "The sub-domain-id of this sub-domain.";
            }
            uses te-adjID;

            list te-bsl {
                key "fwd-bsl";
                description "The forwarding items in one bitstringlength.";
                leaf fwd-bsl {
                    type uint16;
                    description "The value of bitstringlength.";
                }
                uses te-fwd-item;
            }
            uses te-ecmp;
            uses te-frr {
                if-feature bier-te-frr;
            }
        }
    }

    /*
    * Configuration data nodes
    */
    augment "/rt:routing" {
        description "The BIER TE information.";
        container bier-te-config {
            description "The BIER TE information container.";
            uses te-info;
        }
    }

    /*
    * Operational state data nodes
    */
    augment "/rt:routing-state" {



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        description "BIER TE state information.";
        container bier-te-state {
            description "The BIER TE information in nodes.";
            uses te-info;
        }
    }

    /*
    * Notifications
    */
    notification bier-te-notification {
        description
          "This notification is sent when a condition changes in BIER TE.";
        list adjID-is-zero {
            key "if-index";
            description "The adjacency id is zero.";
            leaf if-index {
                type uint32;
                description "The adjacency id of this interface is zero.";
            }
            uses te-adjID-type;
        }
    }
}
<CODE ENDS>

6.  Normative References

   [I-D.eckert-bier-te-arch]
              Eckert, T., Cauchie, G., Braun, W., and M. Menth, "Traffic
              Engineering for Bit Index Explicit Replication BIER-TE",
              draft-eckert-bier-te-arch-04 (work in progress), July
              2016.

   [I-D.eckert-bier-te-frr]
              Eckert, T., Cauchie, G., Braun, W., and M. Menth, "Fast
              ReRoute (FRR) Extensions for BIER-TE", draft-eckert-bier-
              te-frr-00 (work in progress), July 2016.

   [I-D.ietf-bier-architecture]
              Wijnands, I., Rosen, E., Dolganow, A., Przygienda, T., and
              S. Aldrin, "Multicast using Bit Index Explicit
              Replication", draft-ietf-bier-architecture-06 (work in
              progress), April 2017.







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   [I-D.ietf-bier-bier-yang]
              Chen, R., hu, f., Zhang, Z., dai.xianxian@zte.com.cn, d.,
              and M. Sivakumar, "YANG Data Model for BIER Protocol",
              draft-ietf-bier-bier-yang-01 (work in progress), January
              2017.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <http://www.rfc-editor.org/info/rfc6020>.

   [RFC6087]  Bierman, A., "Guidelines for Authors and Reviewers of YANG
              Data Model Documents", RFC 6087, DOI 10.17487/RFC6087,
              January 2011, <http://www.rfc-editor.org/info/rfc6087>.

   [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 7223, DOI 10.17487/RFC7223, May 2014,
              <http://www.rfc-editor.org/info/rfc7223>.

Authors' Addresses

   Zheng(Sandy) Zhang
   ZTE Corporation
   No. 50 Software Ave, Yuhuatai Distinct
   Nanjing
   China

   Email: zhang.zheng@zte.com.cn


   Cui(Linda) Wang
   ZTE Corporation
   No. 50 Software Ave, Yuhuatai Distinct
   Nanjing
   China

   Email: lindawangjoy@gmail.com


   Ran Chen
   ZTE Corporation
   No. 50 Software Ave, Yuhuatai Distinct
   Nanjing
   China

   Email: chen.ran@zte.com.cn





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   Fangwei Hu
   ZTE Corporation
   No.889 Bibo Rd
   Shanghai
   China

   Email: hu.fangwei@zte.com.cn


   Mahesh Sivakumar
   Cisco Systems, Inc.
   510 McCarthy Blvd
   Milpitas,California 95035
   United States

   Email: masivaku@cisco.com



































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