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Versions: (draft-tissa-trill-yang-oam) 00 01 02 03 04

Internet Draft                                           Deepak Kumar
                                                         T. Senevirathne
                                                         Norman Finn
                                                         Samer Salam
                                                            CISCO
                                                         Liang Xia
                                                         Weiguo Hao
                                                            Huawei
Category: Standard Track
Expires Jan 2017                                      July 17, 2016

         YANG Data Model for TRILL Operations, Administration,
and Maintenance (OAM)

                    draft-ietf-trill-yang-oam-04.txt

Status of this Memo

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   This Internet-Draft will expire on May 04, 2016.

Copyright Notice

   Copyright (c) 2016 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



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

Abstract

   This document presents YANG Data model for TRILL OAM. It extends the
   Generic YANG model for OAM defined in with TRILL technology
   specifics. Table of Contents.








































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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2. Conventions used in this document . . . . . . . . . . . . . . .  3
     2.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   3. Architecture of OAM YANG Model and Relationship to TRILL OAM
      PM  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4. TRILL extensions to Generic YANG Model  . . . . . . . . . . . .  4
     4.1 MEP Address  . . . . . . . . . . . . . . . . . . . . . . . .  5
     4.2 Flow Entropy . . . . . . . . . . . . . . . . . . . . . . . .  5
     4.3 Context-id . . . . . . . . . . . . . . . . . . . . . . . . .  5
     4.5 RPC definition . . . . . . . . . . . . . . . . . . . . . . .  5
   5.  OAM data hierarchy . . . . . . . . . . . . . . . . . . . . . .  6
   6. OAM YANG module . . . . . . . . . . . . . . . . . . . . . . . .  9
   7. Base Mode for TRILL OAM . . . . . . . . . . . . . . . . . . . . 19
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 19
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 19
   10.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 20
     10.1.  Normative References  . . . . . . . . . . . . . . . . . . 20
     10.2.  Informative References  . . . . . . . . . . . . . . . . . 20
   11.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 20
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21


1. Introduction

   Fault Management for TRILL is defined in [TRILLOAMFM]. TRILL Fault
   Management utilizes the [8021Q] CFM model and extends CFM with
   technology specific details. Those technology specific extensions are
   flow-entropy for multipath support, MEP addressing on TRILL
   identifiers, and so on. The extensions are explained in detail in
   [TRILLOAMFM]. In this document, we extend the YANG model defined in
   [GENYANGOAM] with TRILL OAM specifics.

2. Conventions used in this document The key words "MUST", "MUST NOT",
   "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT",
   "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
   interpreted as described in RFC-2119 [RFC2119]. In this document,
   these words will appear with that interpretation   only when in ALL
   CAPS. Lower case uses of these words are not to be    interpreted as
   carrying RFC-2119 significance.

2.1.  Terminology

      CCM - Continuity Check Message [8021Q]
      ECMP - Equal Cost Multipath
      LBM - Loopback Message [8021Q]
      MP - Maintenance Point [8021Q]



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      MEP - Maintenance End Point [RFC7174] [8021Q] [RFC6371]
      MIP - Maintenance Intermediate Point [RFC7174] [8021Q] [RFC6371]
      MA - Maintenance Association [8021Q] [RFC7174]
      MD - Maintenance Domain [8021Q]
      MTV - Multi-destination Tree Verification Message
      OAM - Operations, Administration, and Maintenance [RFC6291]
      TRILL - Transparent Interconnection of Lots of Links [RFC6325]



3. Architecture of OAM YANG Model and Relationship to TRILL OAM PM

                             +-+-+-+-+-+
                             |   CO    |
                             |OAM YANG |
                             +-+-+-+-+-+
                                  |
                                  O
                                  |
          +--------------------------------------------------+
          |                |               |                 |
      +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+       +-+-+-+-+-+
      | TRILL   |     | NVO3    |     | MPLS-TP |  . . .|  foo    |
      |OAM YANG |     |OAM YANG |     |OAM YANG |       |OAM YANG |
      +-+-+-+-+-+     +-+-+-+-+-+     +-+-+-+-+-+       +-+-+-+-+-+
            |               |               |               |
          +----------------------------------------------------+
          |             Uniform API                            |
          +----------------------------------------------------+


            Figure 1 Relationship of TRILL OAM YANG model to
                     Generic Connection Oriented OAM YANG model

4. TRILL extensions to Generic YANG Model

   The Technology parameter is defined in the [GENYANGOAM] as an
   identity. This allows easy extension of the YANG model by other
   technologies. Technology-specific extensions are applied only when
   the Technology parameter is set to the specific type. "trill" is
   defined as an identity that augments the base "technology-types".

   identity trill {    base goam:technology-types;    description
   "trill type";  }


            Figure 2 Trill identity type.




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4.1 MEP Address

   In TRILL, the MEP address is the 2 octet RBridge Nickname. In
   [GENYANGOAM] MEP address is defined as a combination choice and case
   statement. We augment this to include TRILL RBridge nickname. augment
   "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:mep-
   address" {    case mep-address-trill {      leaf mep-address-trill {
         when "/goam:domains/goam:domain/goam:technology='trill'";
    type tril-rb-nickname;      }    }  }

              Figure 3 Augment MEP address


4.2 Flow Entropy

   In TRILL, flow-entropy is defined as a 96 octet field. [GENYANGOAM]
   defines a placeholder for flow-entropy. This allows other
   technologies to easily augment that to include technology-specific
   augmentations. Below figure depicts an example of augmenting flow-
   entropy to include TRILL flow-entropy. augment
   "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:flow-entropy" {
   case flow-entropy-trill {      leaf flow-entropy-trill {        type
   flow-entropy-trill;      }    }  }

               Figure 4 TRILL flow-entropy

4.3 Context-id

   In TRILL, context-id is either 12 bit VLAN identifier or 24 bit fine-
   grained label. [GENYANGOAM] defines a placeholder for context-id.
   This allows other technologies to easily augment that to include
   technology specific extensions. The snippet below depicts an example
   of augmenting context-id to include the TRILL context-id.

   augment
   "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:context-id"
   {    case context-id-vlan {      leaf context-id-vlan {        type
   vlan;      }    }    case context-id-fgl {      leaf context-id-fgl {
          type fgl;      }    }  }

                Figure 5 TRILL context-id

4.5 RPC definition

   The rpc model facilitates issuing commands to a NETCONF server (in
   this case to the device that needs to execute the OAM command) and
   obtaining a response. Grouping statement command-ext-trill defines
   the input extensions for TRILL.



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   Continuity-check (CCM)[RFC7455]], continuity-verification
   (LBM/LBR)[RFC7455], and traceroute (PTM/PTR)[RFC7455] are defined in
   Generic Lime Model[GENYANGOAM].

   Multicast Tree Verification (MTV) [RFC7455] rpc command, defined in
   TRILL YANG model, is TRILL specific and allows to verify connectivity
   as well as data-plane and control-plane integrity of TRILL multicast
   forwarding.

5.  OAM data hierarchy

   The complete data hierarchy related to the OAM YANG model is
   presented below. The following notations are used within the data
   tree and carry the meaning as noted below. Each node is printed as:
   <status> <flags> <name> <opts> <type>

     <status> is one of:    +  for current    x  for deprecated    o
   for obsolete

     <flags> is one of:    rw  for configuration data    ro  for non-
   configuration data    -x  for rpcs    -n  for notifications

     <name> is the name of the node

      If the node is augmented into the tree from another module, its
   name is printed as <prefix>:<name>.

   <opts> is one of:    ?  for an optional leaf or choice    !  for a
   presence container    *  for a leaf-list or list    [<keys>] for a
   list's keys

   <type> is the name of the type for leafs and leaf-lists


   module: ietf-trill-oam
   augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:mep-address:
      +--:(mep-address-trill)
         +--rw mep-address-trill?   tril-rb-nickname
   augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:connectivity-context:
      +--:(connectivity-context-vlan)
      |  +--rw connectivity-context-vlan?   vlan
      +--:(connectivity-context-fgl)
         +--rw connectivity-context-fgl?    fgl
   augment /goam:domains/goam:domain/goam:MAs/goam:MA:
      +--rw flow-entropy-trill?   flow-entropy-trill
   augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP:
      +--rw flow-entropy-trill?   flow-entropy-trill
   augment /goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:session:



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      +--rw flow-entropy-trill?   flow-entropy-trill
   augment /goam:continuity-check/goam:input:
      +---- (out-of-band)?
      |  +--:(ipv4-address)
      |  |  +---- ipv4-address?      inet:ipv4-address
      |  +--:(ipv6-address)
      |  |  +---- ipv6-address?      inet:ipv6-address
      |  +--:(trill-nickname)
      |     +---- trill-nickname?    tril-rb-nickname
      +---- diagnostic-vlan?   boolean
   augment /goam:continuity-check/goam:input:
      +---- flow-entropy-trill?   flow-entropy-trill
   augment /goam:continuity-check/goam:output:
      +---- upstream-rbridge?   tril-rb-nickname
      +---- next-hop-rbridge*   tril-rb-nickname
   augment /goam:continuity-verification/goam:input:
      +---- (out-of-band)?
      |  +--:(ipv4-address)
      |  |  +---- ipv4-address?      inet:ipv4-address
      |  +--:(ipv6-address)
      |  |  +---- ipv6-address?      inet:ipv6-address
      |  +--:(trill-nickname)
      |     +---- trill-nickname?    tril-rb-nickname
      +---- diagnostic-vlan?   boolean
   augment /goam:continuity-verification/goam:input:
      +---- flow-entropy-trill?   flow-entropy-trill
   augment /goam:continuity-verification/goam:output:
      +--:(monitor-stats-resp)
      |  +---- tx-packt-count?     oam-counter32
      |  +---- rx-packet-count?    oam-counter32
      |  +---- min-delay?          oam-counter32
      |  +---- average-delay?      oam-counter32
      |  +---- max-delay?          oam-counter32
      +---- upstream-rbridge?   tril-rb-nickname
      +---- next-hop-rbridge*   tril-rb-nickname
   augment /goam:traceroute/goam:input:
      +---- (out-of-band)?
      |  +--:(ipv4-address)
      |  |  +---- ipv4-address?      inet:ipv4-address
      |  +--:(ipv6-address)
      |  |  +---- ipv6-address?      inet:ipv6-address
      |  +--:(trill-nickname)
      |     +---- trill-nickname?    tril-rb-nickname
      +---- diagnostic-vlan?   boolean
   augment /goam:traceroute/goam:input:
      +---- flow-entropy-trill?   flow-entropy-trill
   augment /goam:traceroute/goam:output/goam:response:
      +--:(monitor-stats-ext)



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      |  +---- tx-packt-count?     oam-counter32
      |  +---- rx-packet-count?    oam-counter32
      |  +---- min-delay?          oam-counter32
      |  +---- average-delay?      oam-counter32
      |  +---- max-delay?          oam-counter32
      +---- upstream-rbridge?   tril-rb-nickname
      +---- next-hop-rbridge*   tril-rb-nickname
   rpcs:
      +---x mtv
         +---w input
         |  +---w technology             identityref
         |  +---w MD-name-string         MD-name-string
         |  +---w MA-name-string?        MA-name-string
         |  +---w (out-of-band)?
         |  |  +--:(ipv4-address)
         |  |  |  +---w ipv4-address?          inet:ipv4-address
         |  |  +--:(ipv6-address)
         |  |  |  +---w ipv6-address?          inet:ipv6-address
         |  |  +--:(trill-nickname)
         |  |     +---w trill-nickname?        tril-rb-nickname
         |  +---w diagnostic-vlan?       boolean
         |  +---w (flow-entropy)?
         |  |  +--:(flow-entropy-null)
         |  |  |  +---w flow-entropy-null?     empty
         |  |  +--:(flow-entropy-trill)
         |  |     +---w flow-entropy-trill?    flow-entropy-trill
         |  +---w max-hop-count?         uint8
         |  +---w type?                  identityref
         |  +---w scope*                 tril-rb-nickname
         |  +---w ecmp-choice?           enumeration
         |  +---w outgoing-interfaces* [interface]
         |  |  +---w interface    if:interface-ref
         |  +---w source-mep
         |  |  +---w (mep-address)?
         |  |  |  +--:(mac-address)
         |  |  |  |  +---w mac-address?    yang:mac-address
         |  |  |  +--:(ipv4-address)
         |  |  |  |  +---w ipv4-address?   inet:ipv4-address
         |  |  |  +--:(ipv6-address)
         |  |  |     +---w ipv6-address?   inet:ipv6-address
         |  |  +---w mep-id?         tril-rb-nickname
         |  +---w destination-mep
         |     +---w (mep-address)?
         |     |  +--:(mac-address)
         |     |  |  +---w mac-address?    yang:mac-address
         |     |  +--:(ipv4-address)
         |     |  |  +---w ipv4-address?   inet:ipv4-address
         |     |  +--:(ipv6-address)



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         |     |     +---w ipv6-address?   inet:ipv6-address
         |     +---w mep-id?         tril-rb-nickname
         +--ro output
            +--ro response* [mep-address mep-id]
               +--ro hop-count?                  uint8
               +--ro mep-id                      tril-rb-nickname
               +--ro mep-address                 tril-rb-nickname
               +--ro next-hop-rbridge*           tril-rb-nickname
               +--ro upstream-rbridge?           tril-rb-nickname
               +--ro multicast-receiver-count?   uint32
               +--ro tx-packt-count?             oam-counter32
               +--ro rx-packet-count?            oam-counter32
               +--ro min-delay?                  oam-counter32
               +--ro average-delay?              oam-counter32
               +--ro max-delay?                  oam-counter32



6. OAM YANG module


   <CODE BEGINS> file "ietf-trill-oam.yang"
   module ietf-trill-oam {
        namespace "urn:ietf:params:xml:ns:yang:ietf-trill-oam";
        prefix trilloam;

        import ietf-conn-oam {
          prefix goam;
        }
        import ietf-inet-types {
          prefix inet;
        }
        import ietf-interfaces {
          prefix if;
        }
        import ietf-yang-types {
          prefix yang;
        }
        organization "IETF TRILL Working Group";
        contact
          "
           WG List: mailto:trill@ietf.org
           Editor: Deepak Kumar dekumar@cisco.com";
        description
          "This YANG module defines the configuration for TRILL,
           OAM Fault Management statistics and rpc";

        revision 2016-07-17 {



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          description
            "Initial revision.";
          reference "draft-ietf-trill-yang-oam";
        }

       identity trill {
          base goam:technology-types;
          description
            "trill type";
        }

        typedef oam-counter32 {
          type yang:zero-based-counter32;
          description
            "defines 32 bit counter for OAM";
        }

        typedef tril-rb-nickname {
          type uint16;
          description
           "Trill Rbridge Nickname";
        }

        typedef flow-entropy-trill {
          type binary {
            length "1..96";
          }
          description
            "Flow entropy as defined in RFC7455";
        }

        typedef vlan {
          type uint16 {
            range "0..4095";
          }
          description
            "Vlan Identifier.";
        }

        typedef fgl {
          type uint32;
          description
            "Fine Grain Label";
        }

        identity trill-mtv {
          base goam:command-sub-type;
          description



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            "identfies this command as multicast tree verification comand";
        }

        identity trill-ping {
          base goam:command-sub-type;
          description
            "identifies the command as TRILL Loopback Request";
        }

        identity trill-trace-route {
          base goam:command-sub-type;
          description
            "identifies the command as TRILL Pathtrace Request.";
        }

        grouping command-ext-trill {
          description
            "group the rpc command extensions for trill";
          choice out-of-band {
            case ipv4-address {
              leaf ipv4-address {
                type inet:ipv4-address;
                description
                  "ip version 4 address of the device where out of
                   band reply should be sent.";
              }
            }
            case ipv6-address {
              leaf ipv6-address {
                type inet:ipv6-address;
                description
                  "ip version 6 address of the device where out of
                   band reply should be sent.";
              }
            }
            case trill-nickname {
              leaf trill-nickname {
                type tril-rb-nickname;
                description
                  "TRILL Rbridge Nickname of the device where out of
                   band reply should be sent.";
              }
            }
            description
              "presence of this node indicate out of band request needed";
          }
          leaf diagnostic-vlan {
            type boolean;



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            description
              "indicates whether to include diagnostic VLAN/fgl TLV or not
               in the request.  actual value is the VLAN/FGL specified
               in the command";
          }
        }
        grouping monitor-stats-trill {
          leaf tx-packt-count {
            type oam-counter32;
            description
              "Transmitted Packet count";
          }
          leaf rx-packet-count {
            type oam-counter32;
            description
              "Received packet count, zero for one way message (CCM).";
          }
          leaf min-delay {
            type oam-counter32;
            units milliseconds;
            description
              "Delay is specified in milliseconds, zero for one
               way message (CCM).";
          }
          leaf average-delay {
            type oam-counter32;
            units millisecond;
            description
              "average delay in milliseconds, zero for one way
               message (CCM).";
          }

          leaf max-delay {
            type oam-counter32;
            units millisecond;
            description
              "Maximum delay in milliseconds, zero for one way
               message (CCM).";
          }
          description
            "Monitor Statistics";
      }

      augment "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:mep-address" {
          case mep-address-trill {
            leaf mep-address-trill {
              when "/goam:domains/goam:domain/goam:technology='trill'" {
                description



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                 "Technology TRILL";
              }
              type tril-rb-nickname;
              description
               "MEP Address TRILL Rbridge Nickname.";
            }
          }
          description
            "Extend Generic OAM Maintenance Point Address.";
        }

        augment "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:connectivity-context" {
          case connectivity-context-vlan {
            leaf connectivity-context-vlan {
              type vlan;
              description
                "Connectivity context Vlan Identifier.";
            }
          }
          case connectivity-context-fgl {
            leaf connectivity-context-fgl {
              type fgl;
              description
               "connectivity context Fine Grain Label.";
            }
          }
          description
            "Extends connectivity context.";
        }

        augment "/goam:domains/goam:domain/goam:MAs/goam:MA" {
          leaf flow-entropy-trill {
            type flow-entropy-trill;
            description
              "connectivity context flow entropy.";
          }
          description
            "Extends Flow Entropy.";
        }

        augment
      "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP" {
          leaf flow-entropy-trill {
            type flow-entropy-trill;
            description
              "Flow Entropy TRILL";
          }
          description



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            "Extends Flow Entropy defined under Generic OAM MEP.";
        }

        augment
      "/goam:domains/goam:domain/goam:MAs/goam:MA/goam:MEP/goam:session" {
          leaf flow-entropy-trill {
            type flow-entropy-trill;
            description
              "Flow Entropy TRILL";
          }
          description
            "Extends Flow Entropy defined under Generic OAM Session.";
        }
        augment "/goam:continuity-check/goam:input" {
          uses command-ext-trill;
          description
            "Extends continuity check input.";
        }
        augment "/goam:continuity-check/goam:input" {
          leaf flow-entropy-trill {
            type flow-entropy-trill;
            description
              "Flow Entropy TRILL";
          }
          description
            "Extends continuity check input Flow entropy.";
        }
        augment "/goam:continuity-check/goam:output" {
          description
            "adds trill specific items on the response";
          leaf upstream-rbridge {
            type tril-rb-nickname;
            description
              "Trill Rbridge nickname.";
          }
          leaf-list next-hop-rbridge {
            type tril-rb-nickname;
            description
              "nickname of the next hop RBRdige";
          }
        }
       augment "/goam:continuity-verification/goam:input" {
          uses command-ext-trill;
          description
            "Extends continuity check input.";
        }

        augment "/goam:continuity-verification/goam:input" {



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          leaf flow-entropy-trill {
            type flow-entropy-trill;
            description
              "Flow Entropy TRILL";
          }
          description
            "Extends continuity check input Flow entropy.";
        }

        augment "/goam:continuity-verification/goam:output" {
          description
            "adds trill specific items on the response";
          case monitor-stats-resp {
            uses monitor-stats-trill;
          }
          leaf upstream-rbridge {
            type tril-rb-nickname;
            description
              "Trill Rbridge nickname.";
          }
          leaf-list next-hop-rbridge {
            type tril-rb-nickname;
            description
              "nickname of the next hop RBRdige";
          }
        }
    augment "/goam:traceroute/goam:input" {
          uses command-ext-trill;
          description
             "Extends path disovery Input.";
        }

        augment "/goam:traceroute/goam:input" {
          leaf flow-entropy-trill {
            type flow-entropy-trill;
            description
              "Flow entropy TRILL.";
          }
          description
            "Extends path discovery input flow entropy.";
        }

        augment "/goam:traceroute/goam:output/goam:response" {
          description
            "adds trill specific items on the response";
          case monitor-stats-ext {
            uses monitor-stats-trill;
          }



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          leaf upstream-rbridge {
            type tril-rb-nickname;
            description
              "Upstream Rbridge nickname.";
          }
          leaf-list next-hop-rbridge {
            type tril-rb-nickname;
            description
              "nickname of the next hop RBRdige";
          }
        }

        rpc mtv {
          description
            "Generates Trace-route and return response. Starts with TTL
             of one and increment by one at each hop. Untill destination
             reached or TTL reach max valune";
          input {
            uses goam:maintenance-domain-id {
              description
                "Specifies the MA-domain";
            }
            uses goam:ma-identifier {
              description
                "identfies the Maintenance association";
            }
            uses command-ext-trill {
              description
                "defines extensions needed for trill.
                 We are using this structure so mtv command is in line
                 with ping and trace-route";
            }

            choice flow-entropy {
              case flow-entropy-null {
                leaf flow-entropy-null {
                  type empty;
                  description
                    "Empty flow entropy";
                }
              }
              case flow-entropy-trill {
                leaf flow-entropy-trill {
                  type flow-entropy-trill;
                  description
                    "Flow Entroy TRILL";
                }
              }



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              description
                "Flow Entropy choices.";
            }

            leaf max-hop-count {
              type uint8;
              default "255";
              description
                "Defines maximum value of hop count";
            }

            leaf type {
              type identityref {
                base goam:command-sub-type;
              }
              description
                "defines different command types";
            }

            leaf-list scope {
              type tril-rb-nickname;
              description
                "This list contain rbridges that needed to respond
                 Empty list indicate all Rbridges needed to respond";
              reference "RFC7455";
            }

            leaf ecmp-choice {
              type enumeration {
                enum "ecmp-use-platform-hash" {
                  value 0;
                  description
                    "Use Platform hashing to send packet on
                     specified interface.";
                }
                enum "ecmp-use-round-robin" {
                  value 1;
                  description
                    "Use round robin hashing.";
                }
              }
              description
                "Ecmp Choice enumeration.";
            }

            list outgoing-interfaces {
              key "interface";
              leaf interface {



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                type if:interface-ref;
                description
                  "Interface";
              }
              description
                "List of Outgoing Interface.";
            }
            container source-mep {
              uses goam:mep-address;
              description
                "Source MEP Container.";
              leaf mep-id {
                type tril-rb-nickname;
                description
                  "Trill Rbridge Nickname";
              }
            }
            container destination-mep {
              uses goam:mep-address;
              leaf mep-id {
                type tril-rb-nickname;
                description
                  "MEP Identifier.";
              }
              description
               "Destination MEP Identifier.";
            }
          }
          output {
            list response {
              key "mep-address mep-id";
              leaf hop-count {
                type uint8;
                description
                  "unsigned integer 1-255";
              }
              leaf mep-id {
                type tril-rb-nickname;
                description
                  "Maintenance Endpoint Identifier.";
              }
              leaf mep-address {
                type tril-rb-nickname;
                description
                  "Maintenance Endpoint Address.";
              }
              leaf-list next-hop-rbridge {
                type tril-rb-nickname;



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                description
                  "list of downstream rbridges. There is no perticular
      order";
              }
              leaf upstream-rbridge {
                type tril-rb-nickname;
                description
                  "Upstream Rbridge Nickname.";
              }
              leaf multicast-receiver-count {
                type uint32;
                description
                  "number of ports that are interested in this multicast
      stream";
              }
              uses monitor-stats-trill;
              description
                "Output list.";
            }
          }
        }
   }

   <CODE ENDS>

7. Base Mode for TRILL OAM The Base Mode defines default configuration
   that MUST be present in the devices that comply with this document.
   Base Mode allows users to have a zero-touch experience. Details of
   TRILL Base Mode for OAM are defined in RFC7455 Appendix B.

8.  Security Considerations

   There are no security considerations relevant to this document.

9.  IANA Considerations

   This document registers the following namespace URI in the IETF XML
   registry. URI:urn:ietf:params:xml:ns:yang:ietf-trill-oam













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10.  References

10.1.  Normative References

   [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2234] Crocker, D. and Overell, P.(Editors), "Augmented BNF for
              Syntax Specifications: ABNF", RFC 2234, Internet Mail
              Consortium and Demon Internet Ltd., November 1997.

   [8021Q]   IEEE, "Media Access Control (MAC) Bridges and Virtual
              Bridged Local Area Networks", IEEE Std 802.1Q-2011,
              August, 2011.

   [RFC7174] Salam, S., et.al., "Transparent Interconnect of Lots of
              Links (TRILL) OAM Framework", May, 2014.

   [RFC7455] Senevirathne, T., et.al, "Transparent Interconnect of Lots
              of Links(TRILL): Fault Management", March, 2015



10.2.  Informative References

   [RFC7174] TRILL OAM Framework

   [Y1731]   ITU, "OAM functions and mechanisms for Ethernet based
              networks", ITU-T G.8013/Y.1731, July, 2011.

   [RFC6291] Andersson, L., et.al., "Guidelines for the use of the "OAM"
              Acronym in the IETF" RFC 6291, June 2011.

   [RFC6325]    Perlman, R., et.al., "Routing Bridges (RBridges): Base
              Protocol Specification", RFC 6325, July 2011.

   [GENYANGOAM] Senevirathne, T., et.al., "YANG Data Model for
              Operations, Administration and Maintenance (OAM)", Work in
              Progress, March, 2014.

11.  Acknowledgments

              Giles Heron came up with the idea of developing a YANG
              model as a way of creating a unified OAM API set
              (interface), work in this document is largely an
              inspiration of that. Alexander Clemm provided many
              valuable tips, comments and remarks that helped to refine
              the YANG model presented in this document.



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Authors' Addresses

   Authors' Addresses
   Tissa Senevirathne
   CISCO Systems
   375 East Tasman Drive.
   San Jose, CA 95134
   USA.

   Phone: 408-853-2291
   Email: tsenevir@cisco.com

   Norman Finn
   CISCO Systems
   510 McCarthy Blvd
   Milpitas, CA 95035.

   Email: nfinn@cisco.com

   Deepak Kumar
   CISCO Systems
   510 McCarthy Blvd
   Milpitas, CA 95035.

   Email: dekumar@cisco.com

   Samer Salam
   CISCO Systems
   595 Burrard St. Suite 2123
   Vancouver, BC V7X 1J1, Canada

   Email: ssalam@cisco.com

   Liang Xia
   Huawei technologies


   Email: frank.xialiang@huawei.com

   Weiguo Hao
   Huawei Technologies
   101 Software Avenue
   Nanjing 210012, China

   Email: haoweiguo@huawei.com






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