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ISIS Working Group                                          S. Litkowski
Internet-Draft                                                    Orange
Intended status: Standards Track                                D. Yeung
Expires: December 25, 2015                                     A. Lindem
                                                           Cisco Systems
                                                                J. Zhang
                                                        Juniper Networks
                                                               L. Lhotka

                                                           June 23, 2015


                   YANG Data Model for ISIS protocol
                    draft-ietf-isis-yang-isis-cfg-03

Abstract

   This document defines a YANG data model that can be used to configure
   and manage ISIS protocol on network elements.  It also defined an
   extension module for segment routing configuration and operation.

Requirements Language

   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 [RFC2119].

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 December 25, 2015.








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Copyright Notice

   Copyright (c) 2015 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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Tree diagram  . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Design of the Data Model  . . . . . . . . . . . . . . . . . .   3
     2.1.  ISIS Configuration  . . . . . . . . . . . . . . . . . . .   9
     2.2.  Multitopology Parameters  . . . . . . . . . . . . . . . .  10
     2.3.  Per-Level Parameters  . . . . . . . . . . . . . . . . . .  10
     2.4.  Per-Interface Parameters  . . . . . . . . . . . . . . . .  10
     2.5.  ISO parameters  . . . . . . . . . . . . . . . . . . . . .  11
     2.6.  IP FRR  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     2.7.  Operational State . . . . . . . . . . . . . . . . . . . .  11
   3.  RPC Operations  . . . . . . . . . . . . . . . . . . . . . . .  12
   4.  Notifications . . . . . . . . . . . . . . . . . . . . . . . .  12
   5.  Segment Routing . . . . . . . . . . . . . . . . . . . . . . .  16
     5.1.  Segment Routing activation  . . . . . . . . . . . . . . .  19
     5.2.  Advertising mapping server policy . . . . . . . . . . . .  19
   6.  Interaction with Other YANG Modules . . . . . . . . . . . . .  19
   7.  ISIS YANG Module  . . . . . . . . . . . . . . . . . . . . . .  20
   8.  ISIS Segment Routing YANG Module  . . . . . . . . . . . . . .  94
   9.  Security Considerations . . . . . . . . . . . . . . . . . . . 106
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . . 107
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . 108
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 108
   13. Normative References  . . . . . . . . . . . . . . . . . . . . 108
   Appendix A.  Example: NETCONF <get> Reply . . . . . . . . . . . . 108
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . 111

1.  Introduction

   This document defines a YANG data model for ISIS routing protocol.





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   The data model covers configuration of an ISIS routing protocol
   instance as well as operational states.

1.1.  Tree diagram

   A simplified graphical representation of the data model is presented
   in Section 2.

   The meaning of the symbols in these diagrams is as follows:

   o  Brackets "[" and "]" enclose list keys.

   o  Curly braces "{" and "}" contain names of optional features that
      make the corresponding node conditional.

   o  Abbreviations before data node names: "rw" means configuration
      (read-write), and "ro" state data (read-only).

   o  Symbols after data node names: "?" means an optional node and "*"
      denotes a "list" or "leaf-list".

   o  Parentheses enclose choice and case nodes, and case nodes are also
      marked with a colon (":").

   o  Ellipsis ("...") stands for contents of subtrees that are not
      shown.

2.  Design of the Data Model

   The ISIS YANG module is divided in two main "isis" containers that
   are augmenting the "routing-protocol" lists in ietf-routing module
   with specific ISIS parameters.

   One container contains the writable parameters, while the other
   contains the operational states.

   The figure below describe the overall structure of the isis YANG
   module:

module: ietf-isis
augment /rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route:
   +--ro metric?       uint32
   +--ro tag*          uint64
   +--ro route-type?   enumeration
augment /rt:active-route/rt:output/rt:route:
   +--ro metric?       uint32
   +--ro tag*          uint64
   +--ro route-type?   enumeration



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augment /if:interfaces/if:interface:
   +--rw clns-mtu?   uint16
augment /rt:routing/rt:routing-instance/rt:routing-protocols/rt:routing-protocol:
   +--rw isis
      +--rw enable?                   boolean {admin-control}?
      +--rw level-type?               level
      +--rw system-id?                system-id
      +--rw maximum-area-addresses?   uint8 {maximum-area-addresses}?
      +--rw area-address*             area-address
      +--rw mpls
      |  +--rw ipv4-router-id?   inet:ipv4-address {ipv4-router-id}?
      |  +--rw ipv6-router-id?   inet:ipv6-address {ipv6-router-id}?
      |  +--rw igp-ldp-sync {igp-ldp-sync}?
      +--rw reference-bandwidth?      uint32 {reference-bandwidth}?
      +--rw lsp-mtu?                  uint16
      +--rw lsp-lifetime?             uint16
      +--rw lsp-refresh?              uint16 {lsp-refresh}?
      +--rw graceful-restart {graceful-restart}?
      |  +--rw enable?   boolean
      +--rw node-tag {node-tag}?
      |  +--rw node-tag* [tag]
      |        ...
      +--rw authentication* [level]
      |  +--rw (authentication-type)?
      |  |     ...
      |  +--rw level           level
      +--rw metric-type* [level]
      |  +--rw value?   enumeration
      |  +--rw level    level
      +--rw preference* [level]
      |  +--rw (granularity)?
      |  |     ...
      |  +--rw level       level
      +--rw default-metric* [level]
      |  +--rw value?   wide-metric
      |  +--rw level    level
      +--rw af* [af] {nlpid-control}?
      |  +--rw af        identityref
      |  +--rw enable?   boolean
      +--rw overload* [level]
      |  +--rw status?    boolean
      |  +--rw timeout?   uint16
      |  +--rw level      level
      +--rw overload-max-metric* [level] {overload-max-metric}?
      |  +--rw status?    boolean
      |  +--rw timeout?   uint16
      |  +--rw level      level
      +--rw fast-reroute {fast-reroute}?



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      |  +--rw lfa {lfa}?
      +--rw topologies* [name] {multi-topology}?
      |  +--rw enable?           boolean
      |  +--rw name              rt:rib-ref
      |  +--rw default-metric* [level]
      |  |     ...
      |  +--rw node-tag {node-tag}?
      |  |     ...
      |  +--rw fast-reroute {fast-reroute}?
      |        ...
      +--rw interfaces
         +--rw interface* [name]
               ...
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol:
   +--ro isis
      +--ro enable?                   boolean {admin-control}?
      +--ro level-type?               level
      +--ro system-id?                system-id
      +--ro maximum-area-addresses?   uint8 {maximum-area-addresses}?
      +--ro area-address*             area-address
      +--ro mpls
      |  +--ro ipv4-router-id?   inet:ipv4-address {ipv4-router-id}?
      |  +--ro ipv6-router-id?   inet:ipv6-address {ipv6-router-id}?
      |  +--ro igp-ldp-sync {igp-ldp-sync}?
      +--ro reference-bandwidth?      uint32 {reference-bandwidth}?
      +--ro lsp-mtu?                  uint16
      +--ro lsp-lifetime?             uint16
      +--ro lsp-refresh?              uint16 {lsp-refresh}?
      +--ro graceful-restart {graceful-restart}?
      |  +--ro enable?   boolean
      +--ro node-tag {node-tag}?
      |  +--ro node-tag* [tag]
      |        ...
      +--ro authentication* [level]
      |  +--ro (authentication-type)?
      |  |     ...
      |  +--ro level           level
      +--ro metric-type* [level]
      |  +--ro value?   enumeration
      |  +--ro level    level
      +--ro preference* [level]
      |  +--ro (granularity)?
      |  |     ...
      |  +--ro level       level
      +--ro default-metric* [level]
      |  +--ro value?   wide-metric
      |  +--ro level    level
      +--ro af* [af] {nlpid-control}?



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      |  +--ro af        identityref
      |  +--ro enable?   boolean
      +--ro overload* [level]
      |  +--ro status?    boolean
      |  +--ro timeout?   uint16
      |  +--ro level      level
      +--ro overload-max-metric* [level] {overload-max-metric}?
      |  +--ro status?    boolean
      |  +--ro timeout?   uint16
      |  +--ro level      level
      +--ro fast-reroute {fast-reroute}?
      |  +--ro lfa {lfa}?
      |  +--ro protected-routes
      |  |     ...
      |  +--ro nonprotected-routes
      |  |     ...
      |  +--ro protection-statistics* [frr-protection-method]
      |        ...
      +--ro topologies* [name]
      |  +--ro name          rt:rib-ref
      |  +--ro fast-route {fast-reroute}?
      |        ...
      +--ro system-counters
      |  +--ro level* [level]
      |        ...
      +--ro interfaces
      |  +--ro interface* [interface]
      |        ...
      +--ro spf-log
      |  +--ro event* [id]
      |        ...
      +--ro lsp-log
      |  +--ro event* [id]
      |        ...
      +--ro database
      |  +--ro level-db* [level]
      |        ...
      +--ro hostnames
         +--ro hostname* [system-id]
               ...
rpcs:
   +---x clear-adjacency
   |  +--ro input
   |     +--ro routing-instance-name             rt:routing-instance-state-ref
   |     +--ro routing-protocol-instance-name    instance-state-ref
   |     +--ro level?                            level
   |     +--ro interface?                        string
   +---x clear-database



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      +--ro input
         +--ro routing-instance-name             rt:routing-instance-state-ref
         +--ro routing-protocol-instance-name    instance-state-ref
         +--ro level?                            level
notifications:
   +---n database-overload
   |  +--ro instance-name?    string
   |  +--ro instance-level?   level
   |  +--ro overload?         enumeration
   +---n lsp-too-large
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro pdu-size?              uint32
   |  +--ro lsp-id?                lsp-id
   +---n corrupted-lsp-detected
   |  +--ro instance-name?    string
   |  +--ro instance-level?   level
   |  +--ro lsp-id?           lsp-id
   +---n attempt-to-exceed-max-sequence
   |  +--ro instance-name?    string
   |  +--ro instance-level?   level
   |  +--ro lsp-id?           lsp-id
   +---n id-len-mismatch
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro pdu-field-len?         uint8
   |  +--ro raw-pdu?               binary
   +---n max-area-addresses-mismatch
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro max-area-addresses?    uint8
   |  +--ro raw-pdu?               binary
   +---n own-lsp-purge
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro lsp-id?                lsp-id



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   +---n sequence-number-skipped
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro lsp-id?                lsp-id
   +---n authentication-type-failure
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro raw-pdu?               binary
   +---n authentication-failure
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro raw-pdu?               binary
   +---n version-skew
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro protocol-version?      uint8
   |  +--ro raw-pdu?               binary
   +---n area-mismatch
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro raw-pdu?               binary
   +---n rejected-adjacency
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro raw-pdu?               binary
   |  +--ro reason?                string
   +---n protocols-supported-mismatch
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string



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   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro raw-pdu?               binary
   |  +--ro protocols*             uint8
   +---n lsp-error-detected
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro lsp-id?                lsp-id
   |  +--ro raw-pdu?               binary
   |  +--ro error-offset?          uint32
   |  +--ro tlv-type?              uint8
   +---n adjacency-change
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro neighbor?              string
   |  +--ro neighbor-system-id?    system-id
   |  +--ro level?                 level
   |  +--ro state?                 enumeration
   |  +--ro reason?                string
   +---n lsp-received
   |  +--ro instance-name?         string
   |  +--ro instance-level?        level
   |  +--ro interface-name?        string
   |  +--ro interface-level?       level
   |  +--ro extended-circuit-id?   extended-circuit-id
   |  +--ro lsp-id?                lsp-id
   |  +--ro sequence?              uint32
   |  +--ro received-timestamp?    yang:timestamp
   |  +--ro neighbor-system-id?    system-id
   +---n lsp-generation
      +--ro instance-name?    string
      +--ro instance-level?   level
      +--ro lsp-id?           lsp-id
      +--ro sequence?         uint32
      +--ro send-timestamp?   yang:timestamp

2.1.  ISIS Configuration

   The ISIS configuration supports a VRF-centric configuration approach.
   The isis configuration is applied directly within the appropriate
   routing-instance where ISIS is activated.




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   The ISIS configuration container is divided in:

   o  Global parameters.

   o  Per interface configuration (see Section 2.4).

   It would to up to extension modules to augment this model to support
   vendor specific parameters.

2.2.  Multitopology Parameters

   The "topologies" list is used to enable support of MT extensions for
   specific address families.

   Each topology should refer to an existing RIB.

   Some specific parameters could be defined for a specific topology at
   global level and also at interface level.

2.3.  Per-Level Parameters

   Some parameters support per level configuration.  In this case, the
   parameter is built as a list, so different values could be used for
   each level.  The "level-all" permits to apply a value to both levels.

           +--rw priority* [level]
           |  +--rw value?   uint8
           |  +--rw level    level

   Example :

           <priority>
               <value>100</value>
               <level>level-1</level>
           </priority>
           <priority>
               <value>200</value>
               <level>level-2</level>
           </priority>

2.4.  Per-Interface Parameters

   The per-interface section of the ISIS instance describes the
   interface specific parameters.

   The interface is a reference to an interface in the Interface YANG
   model.




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   Each interface has interface-specific parameters that may have a
   different value per level as described in previous section.  An
   interface-specific parameter always override an ISIS global parameter
   .

   Some parameters like BFD and hello-padding are defined as containers
   to permit easy extension by vendor specific modules.

   TODO : interfaces.tree

2.5.  ISO parameters

   Some ISO parameters may be required.

   This module augments interface configuration model to support ISO
   configuration parameters.

   The clns-mtu can be defined under the interface.

2.6.  IP FRR

   This YANG model supports LFA and remote LFA as IP FRR techniques.
   The "fast-reroute" container may be augmented by other models to
   support other IPFRR flavors (MRT ...).

   The current version of the model supports activation of LFA and
   remote LFA at interface only.  The global "lfa" container is present
   but kept empty to permit augmentation with vendor specific properties
   like policies.

   Remote LFA is considered as a child of LFA.  Remote LFA cannot be
   enabled if LFA is not enabled.

   The "candidate-disabled" permit to mark an interface to not be used
   as a backup.

2.7.  Operational State

   "isis" container provides operational states for ISIS.  This
   container is divided in multiple components:

   o  system-counters : provides statistical informations about the
      global system.

   o  interface : provides configuration state information for each
      interface.





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   o  adjacencies: provides state information about current ISIS
      adjacencies.

   o  spf-log: provides information about SPF events on the node.

   o  lsp-log: provides information about LSP events on the node
      (reception of an LSP or modification of local LSP).

   o  database: provides details on current LSDB.

   o  hostnames: provides information about system-id to hostname
      mappings.

   o  fast-reroute: provides information about IP FRR.

3.  RPC Operations

   The "ietf-isis" module defines two RPC operations:

   o  clear-isis-database: reset the content of a particular ISIS
      database and restart database synchronization with the neighbors.

   o  clear-isis-adjacency: restart a particular set of ISIS
      adjacencies.

rpcs:
   +---x clear-adjacency
   |  +--ro input
   |     +--ro routing-instance-name             rt:routing-instance-state-ref
   |     +--ro routing-protocol-instance-name    instance-state-ref
   |     +--ro level?                            level
   |     +--ro interface?                        string
   +---x clear-database
      +--ro input
         +--ro routing-instance-name             rt:routing-instance-state-ref
         +--ro routing-protocol-instance-name    instance-state-ref
         +--ro level?                            level

4.  Notifications

   The "ietf-isis" module introduces some notifications :

      database-overload : raised when overload condition is changed.

      lsp-too-large : raised when the system tries to propagate a too
      large PDU.





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      corrupted-lsp-detected : raised when the system find that an LSP
      that was stored in memory has become corrupted.

      attempt-to-exceed-max-sequence : This notification is sent when
      the system wraps the 32-bit sequence counter of an LSP.

      id-len-mismatch : This notification is sent when we receive a PDU
      with a different value for the System ID length.

      max-area-addresses-mismatch : This notification is sent when we
      receive a PDU with a different value for the Maximum Area
      Addresses.

      own-lsp-purge : This notification is sent when the system receives
      a PDU with its own system ID and zero age.

      sequence-number-skipped : This notification is sent when the
      system receives a PDU with its own system ID and different
      contents.  The system has to reissue the LSP with a higher
      sequence number.

      authentication-type-failure : This notification is sent when the
      system receives a PDU with the wrong authentication type field.

      authentication-failure : This notification is sent when the system
      receives a PDU with the wrong authentication information.

      version-skew : This notification is sent when the system receives
      a PDU with a different protocol version number.

      area-mismatch : This notification is sent when the system receives
      a Hello PDU from an IS that does not share any area address.

      rejected-adjacency : This notification is sent when the system
      receives a Hello PDU from an IS but does not establish an
      adjacency for some reason.

      protocols-supported-mismatch : This notification is sent when the
      system receives a non pseudonode LSP that has no matching protocol
      supported.

      lsp-error-detected : This notification is sent when the system
      receives a LSP with a parse error.

      adjacency-change : This notification is sent when an ISIS
      adjacency moves to Up state or to Down state.

      lsp-received : This notification is sent when a LSP is received.



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      lsp-generation : This notification is sent when a LSP is
      regenerated.

   notifications:
      +---n database-overload
      |  +--ro instance-name?    string
      |  +--ro instance-level?   level
      |  +--ro overload?         enumeration
      +---n lsp-too-large
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro pdu-size?              uint32
      |  +--ro lsp-id?                lsp-id
      +---n corrupted-lsp-detected
      |  +--ro instance-name?    string
      |  +--ro instance-level?   level
      |  +--ro lsp-id?           lsp-id
      +---n attempt-to-exceed-max-sequence
      |  +--ro instance-name?    string
      |  +--ro instance-level?   level
      |  +--ro lsp-id?           lsp-id
      +---n id-len-mismatch
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro pdu-field-len?         uint8
      |  +--ro raw-pdu?               binary
      +---n max-area-addresses-mismatch
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro max-area-addresses?    uint8
      |  +--ro raw-pdu?               binary
      +---n own-lsp-purge
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro lsp-id?                lsp-id
      +---n sequence-number-skipped



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      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro lsp-id?                lsp-id
      +---n authentication-type-failure
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro raw-pdu?               binary
      +---n authentication-failure
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro raw-pdu?               binary
      +---n version-skew
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro protocol-version?      uint8
      |  +--ro raw-pdu?               binary
      +---n area-mismatch
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro raw-pdu?               binary
      +---n rejected-adjacency
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro raw-pdu?               binary
      |  +--ro reason?                string
      +---n protocols-supported-mismatch
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level



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      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro raw-pdu?               binary
      |  +--ro protocols*             uint8
      +---n lsp-error-detected
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro lsp-id?                lsp-id
      |  +--ro raw-pdu?               binary
      |  +--ro error-offset?          uint32
      |  +--ro tlv-type?              uint8
      +---n adjacency-change
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro neighbor?              string
      |  +--ro neighbor-system-id?    system-id
      |  +--ro level?                 level
      |  +--ro state?                 enumeration
      |  +--ro reason?                string
      +---n lsp-received
      |  +--ro instance-name?         string
      |  +--ro instance-level?        level
      |  +--ro interface-name?        string
      |  +--ro interface-level?       level
      |  +--ro extended-circuit-id?   extended-circuit-id
      |  +--ro lsp-id?                lsp-id
      |  +--ro sequence?              uint32
      |  +--ro received-timestamp?    yang:timestamp
      |  +--ro neighbor-system-id?    system-id
      +---n lsp-generation
         +--ro instance-name?    string
         +--ro instance-level?   level
         +--ro lsp-id?           lsp-id
         +--ro sequence?         uint32
         +--ro send-timestamp?   yang:timestamp

5.  Segment Routing

   The IS-IS SR YANG module is augmenting IS-IS module for both
   configuration and operational states.






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   The IS-IS SR YANG module requires the base segment routing module
   ([I-D.litkowski-spring-sr-yang]) to be supported as there is a strong
   relationship between those modules.

   The figure below describe the overall structure of the isis-sr YANG
   module:

module: ietf-isis-sr
augment /rt:routing/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis:
   +--rw segment-routing
      +--rw enabled?    boolean
      +--rw bindings
         +--rw advertise
         |  +--rw policies*   string
         +--rw receive?     boolean
augment /rt:routing/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:interfaces/isis:interface:
   +--rw segment-routing
      +--rw adjacency-sid
      |  +--rw advertise-adj-group-sid* [group-id]
      |  |  +--rw group-id    uint32
      |  +--rw advertise-protection?      enumeration
      +--rw prefix-sid
         +--rw ipv4
         |  +--rw prefix-sid* [value]
         |     +--rw value-type?          enumeration
         |     +--rw value                uint32
         |     +--rw last-hop-behavior?   enumeration
         +--rw ipv6
            +--rw prefix-sid* [value]
               +--rw value-type?          enumeration
               +--rw value                uint32
               +--rw last-hop-behavior?   enumeration
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis:
   +--ro segment-routing
      +--ro enabled?    boolean
      +--ro bindings
         +--ro advertise
         |  +--ro policies*   string
         +--ro receive?     boolean
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:interfaces/isis:interface:
   +--ro segment-routing
      +--ro adjacency-sid
      |  +--ro advertise-adj-group-sid* [group-id]
      |  |  +--ro group-id    uint32
      |  +--ro advertise-protection?      enumeration
      +--ro prefix-sid
         +--ro ipv4
         |  +--ro prefix-sid* [value]



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         |     +--ro value-type?          enumeration
         |     +--ro value                uint32
         |     +--ro last-hop-behavior?   enumeration
         +--ro ipv6
            +--ro prefix-sid* [value]
               +--ro value-type?          enumeration
               +--ro value                uint32
               +--ro last-hop-behavior?   enumeration
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp/isis:extended-is-neighbor/isis:neighbor:
   +--ro sid-list* [value]
      +--ro flags?         bits
      +--ro weight?        uint8
      +--ro neighbor-id?   isis:system-id
      +--ro value          uint32
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp/isis:mt-is-neighbor/isis:neighbor:
   +--ro sid-list* [value]
      +--ro flags?         bits
      +--ro weight?        uint8
      +--ro neighbor-id?   isis:system-id
      +--ro value          uint32
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp/isis:extended-ipv4-reachability/isis:prefixes:
   +--ro sid-list* [value]
      +--ro flags?       bits
      +--ro algorithm?   uint8
      +--ro value        uint32
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp/isis:mt-extended-ipv4-reachability/isis:prefixes:
   +--ro sid-list* [value]
      +--ro flags?       bits
      +--ro algorithm?   uint8
      +--ro value        uint32
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp/isis:ipv6-reachability/isis:prefixes:
   +--ro sid-list* [value]
      +--ro flags?       bits
      +--ro algorithm?   uint8
      +--ro value        uint32
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp/isis:mt-ipv6-reachability/isis:prefixes:
   +--ro sid-list* [value]
      +--ro flags?       bits
      +--ro algorithm?   uint8
      +--ro value        uint32
augment /rt:routing-state/rt:routing-instance/rt:routing-protocols/rt:routing-protocol/isis:isis/isis:database/isis:level-db/isis:lsp:
   +--ro segment-routing-bindings* [fec range]
      +--ro fec        string
      +--ro range      uint16
      +--ro flags?     bits
      +--ro weight?    uint8
      +--ro binding*
         +--ro prefix-sid



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         |  +--ro sid-list* [value]
         |     +--ro flags?       bits
         |     +--ro algorithm?   uint8
         |     +--ro value        uint32
         +--ro ero-metric?                           uint32
         +--ro ero
         |  +--ro address-family?   identityref
         |  +--ro loose?            boolean
         |  +--ro address?          string
         +--ro backup-ero
         |  +--ro address-family?   identityref
         |  +--ro loose?            boolean
         |  +--ro address?          string
         +--ro unnumbered-interface-id-ero
         |  +--ro router-id?      string
         |  +--ro interface-id?   uint32
         +--ro backup-unnumbered-interface-id-ero
            +--ro router-id?      string
            +--ro interface-id?   uint32

5.1.  Segment Routing activation

   Activation of segment-routing IS-IS is done by setting the "enabled"
   leaf to true.  This triggers advertisement of segment-routing
   extensions based on the configuration parameters that have been setup
   using the base segment routing module.

5.2.  Advertising mapping server policy

   The base segment routing module defines mapping server policies.  By
   default, IS-IS will not advertise nor receive any mapping server
   entry.  The IS-IS segment-routing module permits to advertise one or
   multiple mapping server policies through the "bindings/advertise/
   policies" leaf-list.  The "bindings/receive" leaf permits to enable
   the reception of mapping server entries.

6.  Interaction with Other YANG Modules

   The "isis" configuration container augments the "/rt:routing/
   rt:routing-instance/rt:routing-protocols/routing-protocol" container
   of the ietf-routing module by defining IS-IS specific parameters.

   The "isis" module augments "/if:interfaces/if:interface" with ISO
   specific parameters.

   The "isis" operational state container augments the "/rt:routing-
   state/rt:routing-instance/rt:routing-protocols/routing-protocol"




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   container of the ietf-routing module by defining ISIS specific
   operational states.

   Some ISIS specific routes attributes are added to route objects of
   the ietf-routing module by augmenting "/rt:routing-
   state/rt:ribs/rt:rib/rt:routes/rt:route" and "/rt:active-
   route/rt:output/rt:route".

7.  ISIS YANG Module

   <CODE BEGINS> file "ietf-isis@2015-06-23.yang"

   module ietf-isis {
     namespace "urn:ietf:params:xml:ns:yang:ietf-isis";

     prefix isis;

     import ietf-routing {
               prefix "rt";
     }

     import ietf-inet-types {
       prefix inet;
     }

     import ietf-yang-types {
       prefix yang;
     }

     import ietf-interfaces {
       prefix "if";
     }

     import ietf-key-chain {
     prefix "key-chain";
     }

     organization
      "IETF ISIS Working Group";

     contact
       "WG List:  &lt;mailto:isis-wg@ietf.org&gt;

       Editor:    Stephane Litkowski
             &lt;mailto:stephane.litkowski@orange.com&gt;

           Derek Yeung
             &lt;mailto:myeung@cisco.com&gt;



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           Acee Lindem
             &lt;mailto:acee@cisco.com&gt;
           Jeffrey Zhang
             &lt;mailto:zzhang@juniper.net&gt;
           Ladislav Lhotka
             &lt;mailto:llhotka@nic.cz&gt;
           Yi Yang
             &lt;mailto:yiya@cisco.com&gt;
           Dean Bogdanovic
             &lt;mailto:deanb@juniper.net&gt;
           Kiran Agrahara Sreenivasa
             &lt;mailto:kkoushik@brocade.com&gt;
           Yingzhen Qu
             &lt;mailto:yiqu@cisco.com&gt;
           Jeff Tantsura
             &lt;mailto:jeff.tantsura@ericsson.com&gt;

       ";

     description
       "The YANG module defines a generic configuration model for
       ISIS common across all of the vendor implementations.";

     revision 2015-06-22  {
       description
        " * Segment routing is part os a separate module.";
       reference "draft-ietf-isis-yang-isis-03";
     }
     revision 2015-03-03 {
       description
        " * Reviewed config and op state groupings.
          * Add default value to lfa candidate-disabled
          * Add enable leaf to isis container to reflect admin state
          * Move to VRF centric only
        ";
       reference "";
     }
     revision 2015-03-03 {
       description
         "
           * Defining hierarchy for operational states
           * Adding CLNS MTU
           * Adding Keychain
         ";
       reference "draft-ietf-isis-yang-isis-02";
     }
     revision 2015-02-20 {
       description



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         "
           * Removing igp-ldp-sync timer in IS-IS

         ";
       reference "";
     }
     revision 2014-12-15 {
       description
         "
           * Adding IPFRR
           * Adding igp-ldp sync
           * Adding segment routing
           * Adding instance reference to operational states.
           * Move AF type from string to identity
           * Updated router-capability in LSDB description.
           * packet counters moved to interface-packet-counters.
           * Added modification information in lsp-log
         ";
       reference "";
     }
     revision 2014-10-24 {
       description
         "
           * Change hello-padding to container
           * Change bfd to container
           * Make BFD a feature
           * Creates mpls-te container and put router-id
           inside
           * Remove GR helper disable and timers
         ";
       reference "draft-ietf-isis-yang-isis-cfg-01";
     }
     revision 2014-10-21 {
       description
         "
          * Interface metric move from af container to interface
           container
          * Hello-padding on interface moved to hello-padding-disable
          with empty type
          * three-way-handshake removed
          * route preference changed to a choice
          * csnp-authentication/psnp-authentication merged
          to authentication container
          * lsp-gen-interval-exp-delay removed
          * Added overload-max-metric feature
          * overload-max-metric is in a separate container
         ";
       reference "";



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     }

     revision 2014-10-07 {
       description
         "
         * Removed spf parameters (should be part of
           vendor specific extensions.
         * Removed hello parameters at global level.
         * Interface configuration uses a string rather
         than a reference. This permits to map to some
         vendor specific configuration.
         ";
       reference "draft-ietf-isis-yang-isis-00";
     }
     revision 2014-09-26 {
       description
         "
         * Add BFD support
         * remove max-elements to max-area-addresses
         ";
       reference "";
     }
     revision 2014-09-11 {
       description
         "
         * Add level parameter to ispf and spf delay
         * Add LSP generation as a feature
         * Make lsp-refresh a feature
         * Change parameter container to list
         ";
       reference "";
     }
     revision 2014-09-05 {
       description
       " Rewrite of the global hierarchy.";
       reference "";
     }
     revision 2014-08-06 {
       description
       "
       * isis-state renamed to isis.
       * Add GR support
       * Add meshgroup support
       * Add CLNS support
       * Add 64bits tags
       * Add notifications to be aligned with MIB4444
       * Add packet-counters, interface-counters, system-counters
         states



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       * Add 3-way handshake support
       * Rename isis-adjacency-updown to adjacency-change
       * Add notification for LSP reception
       * Use feature for reference BW
       * Add lsp-retransmit-interval on interfaces
       * Rename lsp-interval to lsp-pacing-interval
       * Add ispf support as feature
       * Add spf delay support as feature (2step & exp backoff)
       * Add maximum-area-addresses
       * Add default-metric
       ";
       reference "RFC XXXX: YANG Data Model for ISIS Protocol";
     }
     revision 2014-06-25 {
       description "
       * isis-cfg renamed to isis.
       * Add precisions on authentication-keys in description
       ";
       reference "draft-litkowski-isis-yang-isis-01";
     }

     revision 2014-06-20 {
       description "
       * isis-op renamed to isis-state.
       * Multiple instances under ISIS are removed.
       * interface-cfg grouping removed and content
         is directly included in container isis.
       * TLVxx renamed with human-readable name in isis-database.
         TLV reference are putted in description.
       * Reference to core routing module were fixed.
       * Namespace fixed.
       * Add simple-iso-address type.
       * area-id and system-id in ISIS container are merged to
         nsap-address.
       * Add isis-system-id type.
       * Add isis-lsp-id type.
       * Add remaining-lifetime leaf in isis-database.
       * Add TLV2 (is-neighbor) in isis-database.
       * Renamed some container name for consistency
         reason ('isis-' prefixed).
       * Add new identities isis-cfg and isis-state.
       * Add descriptions.
       * Add notification isis-adjacency-updown.
       * Add RPC clear-isis-adjacency and clear-isis-database.
       ";
       reference "draft-litkowski-isis-yang-isis-00";
     }




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     revision 2014-06-11 {
       description "Initial revision.";
       reference "draft-litkowski-netmod-isis-cfg-00";
     }
     identity isis {
       base rt:routing-protocol;
       description "Identity for the ISIS routing protocol.";
     }

     identity isis-adjacency-change {
       description "Identity for the ISIS routing protocol
         adjacency state.";
     }

     identity clear-isis-database {
       description "Identity for the ISIS routing protocol
         database reset action.";
     }

     identity clear-isis-adjacency {
       description "Identity for the ISIS routing protocol
         adjacency reset action.";
     }


     /* Feature definitions */

     feature key-chain {
     description
      "Support of keychain for authentication.";
     }
     feature segment-routing {
       description
        "Support of segment-routing.";
     }
     feature node-tag {
       description
         "Support of node tag.";
     }
     feature igp-ldp-sync {
       description
         "Support of RFC5443.";
     }
     feature fast-reroute {
       description
         "Support of IPFRR.";
     }
     feature  lfa {



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       description
         "Support of Loop Free Alternates.";
     }
     feature remote-lfa {
       description
         "Support of remote Loop Free Alternates.";
     }

     feature bfd {
       description
         "Support of BFD.";
     }
     feature overload-max-metric {
       description
         "Support of overload by setting
          all links to max metric.";
     }
     feature prefix-tag {
       description
         "Add 32bit tag to prefixes";
     }
     feature prefix-tag64 {
       description
         "Add 64bit tag to prefixes";
     }
     feature reference-bandwidth {
       description
         "Use a reference bandwidth to compute metric.";
     }
     feature ipv4-router-id {
       description
        "Support of IPv4 router ID configuration under ISIS.";
     }

     feature ipv6-router-id {
       description
        "Support of IPv6 router ID configuration under ISIS.";
     }

     feature multi-topology {
       description
        "Multitopology routing support.";
     }
     feature nlpid-control {
       description
        "This feature controls the advertisement
         of support NLPID within ISIS configuration.";
     }



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     feature graceful-restart {
       description
         "Graceful restart support as per RFC5306.";
     }


     feature lsp-refresh {
       description
         "Configuration of LSP refresh interval.";
     }

     feature maximum-area-addresses {
       description
         "Support of maximum-area-addresses config.";
     }

     feature admin-control {
       description
        "Control administrative state of ISIS.";
     }

     /* Type definitions */


     typedef instance-state-ref {
       type leafref {
         path "/rt:routing-state/rt:routing-instance/"
         +"rt:routing-protocols/rt:routing-protocol/rt:name";
       }
       description
          "This type is used for leaves that reference state data of
           an ISIS protocol instance.";
     }

     typedef admin-state {
       type enumeration {
         enum "up" {
           description
            "Up state";
         }
         enum "down" {
           description
            "Down state";
         }
       }
       description
        "Administrative state of a component.";
     }



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     typedef oper-state {
       type enumeration {
         enum "up" {
           description
            "Up state";
         }
         enum "down" {
           description
            "Down state";
         }
       }
       description
        "Operational state of a component.";
     }
     typedef circuit-id {
       type uint8;
       description
        "This type defines the circuit ID
        associated with an interface.";
     }

     typedef extended-circuit-id {
       type uint32;
       description
        "This type defines the extended circuit ID
        associated with an interface.";
     }

     typedef interface-type {
       type enumeration {
         enum broadcast {
           description "Broadcast interface type.
           Would result in DIS election.";
         }
         enum point-to-point {
           description
            "Point to point interface type.";
         }
       }
       description
        "This type defines the type of adjacency
        to be established on the interface.
        This is affecting the type of hello
        message that would be used.";

     }

     typedef level {



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       type enumeration {
         enum "level-1" {
           description
            "This enum describes L1 only capability.";
         }
         enum "level-2" {
           description
            "This enum describes L2 only capability.";
         }
         enum "level-all" {
           description
            "This enum describes both levels capability.";
         }
       }
       default "level-all";
       description
        "This type defines ISIS level of an object.";

     }

     typedef level-number {
       type uint8 {
         range "1 .. 2";
       }
       description
        "This type defines a current ISIS level.";
     }

     typedef lsp-id {
       type string {
         pattern
          '[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}\.[0-9A-Fa-f]'
                +'{4}\.[0-9][0-9]-[0-9][0-9]';
       }
       description
        "This type defines ISIS LSP ID using pattern,
         system id looks like : 0143.0438.AeF0.02-01";
     }


     typedef area-address {
       type string {
         pattern '[0-9A-Fa-f]{2}\.([0-9A-Fa-f]{4}\.){0,3}';
       }
       description
        "This type defines the area address.";
     }




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     typedef snpa {
       type string {
         length "0 .. 20";
       }
       description
        "This type defines Subnetwork Point of Attachement format.";

     }

     typedef system-id {
       type string {
         pattern
          '[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}\.00';
       }
       description
        "This type defines ISIS system id using pattern,
         system id looks like : 0143.0438.AeF0.00";
     }

     typedef wide-metric {
       type uint32 {
         range "0 .. 16777215";
       }
       description
        "This type defines wide style format
         of ISIS metric.";
     }

     typedef std-metric {
       type uint8 {
         range "0 .. 63";
       }
       description
        "This type defines old style format
         of ISIS metric.";
     }

     typedef mesh-group-state {
       type enumeration {
         enum "meshInactive" {
           description
            "Interface is not part of a mesh group.";
         }
         enum "meshSet" {
           description
            "Interface is part of a mesh group.";
         }
         enum "meshBlocked" {



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           description
            "LSPs must not be flooded over that interface.";
         }
       }
       description
        "This type describes meshgroup state of an interface";
     }



     /* Grouping definitions */

    grouping admin-control {


       leaf enable {
           if-feature admin-control;
           type boolean;
           default true;
           description
                "Control the administrative
                state.";
       }

       description
        "Grouping for admin control.";
     }

    grouping adjacency-state {
              container adjacencies {
                 list adjacency {
                   leaf neighbor-systype {
                     type level;
                     description
                      "Type of neighboring system";

                   }
                   leaf neighbor-sysid {
                     type system-id;
                     description
                      "The system-id of the neighbor";

                   }
                   leaf neighbor-extended-circuit-id {
                     type extended-circuit-id;
                     description
                      "Circuit ID of the neighbor";
                   }



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                   leaf neighbor-snpa {
                     type snpa;
                     description
                      "SNPA of the neighbor";
                   }
                   leaf usage {
                     type level;
                     description
                     "How is the adjacency used ?
                     On a p2p link this might be level 1 and 2,
                     but on a LAN, the usage will be level 1
                     between peers at L1 or level 2 between
                     peers at L2.";
                   }
                   leaf hold-timer {
                     type uint16;
                     description
                      "The holding time in seconds for this
                       adjacency. This value is based on
                       received hello PDUs and the elapsed
                       time since receipt.";
                   }
                   leaf neighbor-priority {
                     type uint8 {
                       range "0 .. 127";
                     }
                     description
                      "Priority of the neighboring IS for becoming
                       the DIS.";
                   }
                   leaf lastuptime {
                     type yang:timestamp;
                     description
                      "When the adjacency most recently entered
                       state 'up', measured in hundredths of a
                       second since the last reinitialization of
                       the network management subsystem.
                       The value is 0 if the adjacency has never
                       been in state 'up'.";

                   }
                   leaf state {
                     type enumeration {
                       enum "Up" {
                         description
                          "This state describes that
                           adjacency is established.";
                       }



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                       enum "Down" {
                         description
                          "This state describes that
                           adjacency is NOT established.";
                       }
                       enum "Init" {
                         description
                          "This state describes that
                           adjacency is establishing.";
                       }
                       enum "Failed" {
                         description
                          "This state describes that
                           adjacency is failed.";
                       }
                     }
                     description
                      "This leaf describes the state of the
                      interface.";
                   }

                   description
                    "List of operational adjacencies.";
                 }
                 description
                  "This container lists the adjacencies of
                  the local node.";
               }
               description
                "Adjacency state";
    }



     grouping fast-reroute-global-state {
             container protected-routes {
               list af-stats {
                 key "af prefix alternate";

                 leaf af {
                   type identityref {
                     base rt:address-family;
                   }
                   description
                    "Address-family";
                 }
                 leaf prefix {
                   type string;



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                   description
                    "Protected prefix.";
                 }
                 leaf alternate {
                   type string;
                   description
                    "Alternate nexthop for the prefix.";
                 }
                 leaf alternate-type {
                   type enumeration {
                     enum equalcost {
                       description
                        "ECMP alternate.";
                     }
                     enum lfa {
                       description
                        "LFA alternate.";
                     }
                     enum remote-lfa {
                       description
                        "Remote LFA alternate.";
                     }
                     enum tunnel {
                       description
                        "Tunnel based alternate
                        (like RSVP-TE or GRE).";
                     }
                     enum ti-lfa {
                       description
                        "TI LFA alternate.";
                     }
                     enum mrt {
                       description
                        "MRT alternate.";
                     }
                     enum other {
                       description
                        "Unknown alternate type.";
                     }
                   }
                   description
                    "Type of alternate.";
                 }
                 leaf best {
                   type boolean;
                   description
                    "describes if the alternate is the best one.";
                 }



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                 leaf non-best-reason {
                   type string;
                   description
                    "Information field to describe why the alternate
                    is not best.";
                 }
                 leaf protection-available {
                   type bits {
                     bit nodeprotect {
                       position 0;
                       description
                       "Node protection available.";
                     }
                     bit linkprotect {
                       position 1;
                       description
                       "Link protection available.";
                     }
                     bit srlgprotect {
                       position 2;
                       description
                       "SRLG protection available.";
                     }
                     bit downstreamprotect {
                       position 3;
                       description
                       "Downstream protection available.";
                     }
                     bit other {
                       position 4;
                       description
                       "Other protection available.";
                     }
                   }
                   description
                   "Describes protection provided by the alternate.";
                 }
                 leaf alternate-metric1 {
                   type uint32;
                   description
                    "Metric from PLR to destination
                     through the alternate path.";
                 }
                 leaf alternate-metric2 {
                   type uint32;
                   description
                    "Metric from PLR to the alternate node";
                 }



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                 leaf alternate-metric3 {
                   type uint32;
                   description
                    "Metric from alternate node to the destination";
                 }

                 description
                  "Per AF statistics.";
               }
               description
                "List of prefixes that are protected.";
             }

             container nonprotected-routes {
                list af-stats {
                 key "af prefix";

                 leaf af {
                   type identityref {
                     base rt:address-family;
                   }
                   description
                    "Address-family";
                 }
                 leaf prefix {
                   type string;
                   description
                    "Protected prefix.";
                 }
                 description
                  "Per AF statistics.";
               }
               description
                "List of prefixes that are not protected.";
             }

             list protection-statistics {
               key frr-protection-method;

               leaf frr-protection-method {
                 type string;
                 description
                  "Protection method used.";
               }
               list af-stats {
                 key af;

                 leaf af {



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                   type identityref {
                     base rt:address-family;
                   }
                   description
                    "Address-family";
                 }
                 leaf total-routes {
                   type uint32;
                   description
                    "Total prefixes.";
                 }
                 leaf unprotected-routes {
                   type uint32;
                   description
                     "Total of prefixes who are
                     not protected.";
                 }
                 leaf protected-routes {
                   type uint32;
                   description
                     "Total of prefixes who are
                     protected.";
                 }
                 leaf linkprotected-routes {
                   type uint32;
                   description
                     "Total of prefixes who are
                     link protected.";
                 }
                 leaf nodeprotected-routes {
                   type uint32;
                   description
                     "Total of prefixes who are
                     node protected.";
                 }
                 description
                  "Per AF statistics.";
               }

               description
                "Global protection statistics.";
             }
             description
              "IPFRR states.";
     }

     grouping notification-instance-hdr {
       description



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        "This group describes common instance specific
         data for notifications.";
       leaf instance-name {
         type string;
         description
          "Describes the name of the ISIS instance.";
       }
       leaf instance-level {
         type level;
         description
          "Describes the ISIS level of the instance.";
       }
     }

     grouping notification-interface-hdr {
       description
        "This group describes common interface specific
         data for notifications.";
       leaf interface-name {
         type string;
         description
          "Describes the name of the ISIS interface.";
       }
       leaf interface-level {
         type level;
         description
          "Describes the ISIS level of the interface.";
       }
       leaf extended-circuit-id {
         type extended-circuit-id;
         description
          "Describes the extended circuit-id of the interface.";
       }
     }

     grouping route-content {
       description
        "This group add isis-specific route properties.";
       leaf metric {
         type uint32;
         description
          "This leaf describes ISIS metric of a route.";
       }
       leaf-list tag {
         type uint64;
         description
          "This leaf describes list of tags associated
           with the route. The leaf describes both



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           32bits and 64bits tags.";
       }
       leaf route-type {
         type enumeration {
           enum l2-up-internal {
             description "Level 2 internal route
              and not leaked to a lower level";
           }
           enum l1-up-internal {
             description "Level 1 internal route
              and not leaked to a lower level";
           }
           enum l2-up-external {
             description "Level 2 external route
              and not leaked to a lower level";
           }
           enum l1-up-external {
             description "Level 1 external route
              and not leaked to a lower level";
           }
           enum l2-down-internal {
             description "Level 2 internal route
              and leaked to a lower level";
           }
           enum l1-down-internal {
             description "Level 1 internal route
              and leaked to a lower level";
           }
           enum l2-down-external {
             description "Level 2 external route
              and leaked to a lower level";
           }
           enum l1-down-external {
             description "Level 1 external route
              and leaked to a lower level";
           }
         }
         description
          "This leaf describes the type of ISIS route.";
       }
     }

     grouping fast-reroute-global-cfg {
       description
        "This group defines global
        configuration of IPFRR.";

           container lfa {



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             if-feature lfa;
             description
               "This container may be
               augmented with global parameters
               for LFA.
               Creating the container has no effect on
               LFA activation.";
           }

     }


     grouping fast-reroute-if-cfg {
       description
        "This group defines interface
        configuration of IPFRR.";

         list lfa {
           if-feature lfa;

           key level;

           leaf candidate-disabled {
             type boolean;
             default false;
             description
              "Prevent the interface to be used as backup.";
           }
           leaf enable {
             type boolean;
             description
              "Activates LFA.
              This model assumes activation
              of per-prefix LFA.";
           }

           container remote-lfa {
             if-feature remote-lfa;
             leaf enable {
               type boolean;
               description
               "Activates rLFA.";
             }
             description
              "remote LFA configuration.";
           }
           leaf level {
             type level;



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             description
               "Level applicability.";
           }
           description
            "LFA configuration.";
         }

     }




     grouping prefix-ipv4-std {
       description
        "This group defines attributes of an
         IPv4 standard prefix.";
       leaf up-down {
         type boolean;
         description
          "This leaf expresses the value of up/down bit.";
       }
       leaf i-e {
         type boolean;
         description
          "This leaf expresses the value of I/E bit.";
       }
       leaf ip-prefix {
         type inet:ipv4-address;
         description
          "This leaf describes the IPv4 prefix";
       }
       leaf prefix-len {
         type uint8;
         description
          "This leaf describes the IPv4 prefix len in bits";
       }
       leaf default-metric {
         type std-metric;
         description
          "This leaf describes the ISIS default metric value";
       }
       container delay-metric {
         leaf metric {
           type std-metric;
           description
            "This leaf describes the ISIS delay metric value";
         }
         leaf supported {



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           type boolean;
           default "false";
           description
            "This leaf describes if the metric is supported.";
         }

         description
          "This container defines the ISIS delay metric.";
       }
       container expense-metric {
         leaf metric {
           type std-metric;
           description
            "This leaf describes the ISIS expense metric value";
         }
         leaf supported {
           type boolean;
           default "false";
           description
            "This leaf describes if the metric is supported.";
         }
         description
          "This container defines the ISIS expense metric.";
       }
       container error-metric {
         leaf metric {
           type std-metric;
           description
            "This leaf describes the ISIS error metric value";
         }
         leaf supported {
           type boolean;
           default "false";
           description
            "This leaf describes if the metric is supported.";
         }

         description
          "This container defines the ISIS error metric.";
       }
     }

     grouping prefix-ipv4-extended {
       description
        "This group defines attributes of an
         IPv4 extended prefix.";
       leaf up-down {
         type boolean;



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         description
          "This leaf expresses the value of up/down bit.";
       }
       leaf ip-prefix {
         type inet:ipv4-address;
         description
          "This leaf describes the IPv4 prefix";
       }
       leaf prefix-len {
         type uint8;
         description
          "This leaf describes the IPv4 prefix len in bits";
       }

       leaf metric {
         type wide-metric;
         description
          "This leaf describes the ISIS metric value";
       }
       leaf-list tag {
         type uint32;
         description
          "This leaf describes a list of tags associated with
          the prefix.";
       }
       leaf-list tag64 {
         type uint64;
         description
          "This leaf describes a list of 64-bit tags associated with
          the prefix.";
       }

     }

     grouping prefix-ipv6-extended {
       description
        "This group defines attributes of an
         IPv6 prefix.";
       leaf up-down {
         type boolean;
         description
          "This leaf expresses the value of up/down bit.";
       }
       leaf ip-prefix {
         type inet:ipv6-address;
         description
          "This leaf describes the IPv6 prefix";
       }



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       leaf prefix-len {
         type uint8;
         description
          "This leaf describes the IPv4 prefix len in bits";
       }

       leaf metric {
         type wide-metric;
         description
          "This leaf describes the ISIS metric value";
       }
       leaf-list tag {
         type uint32;
         description
          "This leaf describes a list of tags associated with
          the prefix.";
       }
       leaf-list tag64 {
         type uint64;
         description
          "This leaf describes a list of 64-bit tags associated with
          the prefix.";
       }

     }

     grouping neighbor-extended {
       description
        "This group defines attributes of an
         ISIS extended neighbor.";
       leaf neighbor-id {
         type system-id;
         description
          "This leaf describes the system-id of the neighbor.";
       }
       leaf metric {
         type wide-metric;
         description
          "This leaf describes the ISIS metric value";
       }

     }

     grouping neighbor {
       description
        "This group defines attributes of an
         ISIS standard neighbor.";
       leaf neighbor-id {



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         type system-id;
         description
          "This leaf describes the system-id of the neighbor.";
       }
       leaf i-e {
         type boolean;
         description
          "This leaf expresses the value of I/E bit.";
       }
       leaf default-metric {
         type std-metric;
         description
          "This leaf describes the ISIS default metric value";
       }
       container delay-metric {
         leaf metric {
           type std-metric;
           description
            "This leaf describes the ISIS delay metric value";
         }
         leaf supported {
           type boolean;
           default "false";
           description
            "This leaf describes if the metric is supported.";
         }
         description
          "This container defines the ISIS delay metric.";
       }
       container expense-metric {
         leaf metric {
           type std-metric;
           description
            "This leaf describes the ISIS delay expense value";
         }
         leaf supported {
           type boolean;
           default "false";
           description
            "This leaf describes if the metric is supported.";
         }
         description
          "This container defines the ISIS expense metric.";
       }
       container error-metric {
         leaf metric {
           type std-metric;
           description



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            "This leaf describes the ISIS error metric value";
         }
         leaf supported {
           type boolean;
           default "false";
           description
            "This leaf describes if the metric is supported.";
         }
         description
          "This container defines the ISIS error metric.";
       }
     }

     grouping database {
       description
        "This group defines attributes of an
         ISIS database (Link State DB).";
       leaf lsp-id {
         type lsp-id;
         description
          "This leaf describes the LSP ID of the LSP.";
       }
       leaf checksum {
         type uint16;
         description
          "This leaf describes the checksum of the LSP.";
       }
       leaf remaining-lifetime {
         type uint16;
         units "seconds";
         description
          "This leaf describes the remaining lifetime
           in seconds before the LSP expiration.";
       }
       leaf sequence {
         type uint32;
         description
          "This leaf describes the sequence number of the LSP.";
       }
       leaf attributes {
         type bits {
           bit PARTITIONNED {
             description
              "If set, the originator supports partition
               repair.";
           }
           bit ATTACHED-ERROR {
             description



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              "If set, the originator is attached to
               another area using the referred metric.";
           }
           bit ATTACHED-EXPENSE {
             description
              "If set, the originator is attached to
               another area using the referred metric.";
           }
           bit ATTACHED-DELAY {
             description
              "If set, the originator is attached to
               another area using the referred metric.";
           }
           bit ATTACHED-DEFAULT {
             description
              "If set, the originator is attached to
               another area using the referred metric.";
           }
           bit OVERLOAD {
             description
              "If set, the originator is overloaded,
               and must be avoided in path calculation.";
           }
         }
         description
          "This leaf describes attributes of the LSP.";
       }


       container is-neighbor {
         list neighbor {
           key "neighbor-id";
           uses neighbor;
           description
            "List of neighbors.";
         }
         description
          "This leaf describes list of ISIS neighbors.
          ISIS reference is TLV 2.";
       }

       container authentication {
         leaf authentication-type {
           type string;
           description
            "This leaf describes the authentication type
             to be used.";
         }



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         leaf authentication-key {
           type string;
           description
            "This leaf describes the authentication key
             to be used. For security reason, the
             authentication key MUST NOT be presented
             in plaintext format. Authors recommends
             to use MD5 hash to present the authentication-key.";
         }
         description "This container describes authentication
         information of the node. ISIS reference is TLV 10.";
       }

       container extended-is-neighbor {
         list neighbor {
           uses neighbor-extended;
           description
            "List of neighbors.";
         }
         description
          "This container describes list of ISIS extended
          neighbors.
          ISIS reference is TLV 22.";
       }

       container ipv4-internal-reachability {
         list prefixes {
           uses prefix-ipv4-std;
           description
            "List of prefixes.";
         }
         description
          "This container describes list of IPv4 internal
          reachability information.
          ISIS reference is TLV 128.";
       }

       leaf-list protocol-supported {
         type uint8;
         description
          "This leaf describes the list of
          supported protocols.
          ISIS reference is TLV 129.";
       }

       container ipv4-external-reachability {
         list prefixes {
           uses prefix-ipv4-std;



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           description
            "List of prefixes.";
         }
         description
          "This container describes list of IPv4 external
          reachability information.
          ISIS reference is TLV 130.";
       }

       leaf-list ipv4-addresses {
         type inet:ipv4-address;
         description
           "This leaf describes the IPv4 addresses of the node.
           ISIS reference is TLV 132.";
       }

       leaf ipv4-te-routerid {

         type inet:ipv4-address;
         description
           "This leaf describes the IPv4 Traffic Engineering
           router ID of the node.
           ISIS reference is TLV 134.";
       }

       container extended-ipv4-reachability {

         list prefixes {
           uses prefix-ipv4-extended;
           description
            "List of prefixes.";
         }
         description
          "This container describes list of IPv4 extended
          reachability information.
          ISIS reference is TLV 135.";
       }

       leaf dynamic-hostname {
         type string;

         description
          "This leaf describes the name of the node.
          ISIS reference is TLV 137.";
       }

       leaf ipv6-te-routerid {
         type inet:ipv6-address;



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         description
          "This leaf describes the IPv6 Traffic Engineering
           router ID of the node.
           ISIS reference is TLV 140.";
       }


       container mt-is-neighbor {
         list neighbor {
           leaf MT-ID {
             type uint16 {
               range "0 .. 4095";
             }
             description
              "This leaf defines the identifier
               of a topology.";
           }
           uses neighbor-extended;
           description
            "List of neighbors.";
         }
         description
          "This container describes list of ISIS multi-topology
           neighbors.
           ISIS reference is TLV 223.";
       }

       container mt-entries {
         list topology {

           leaf MT-ID {
             type uint16 {
               range "0 .. 4095";
             }
             description
              "This leaf defines the identifier
               of a topology.";
           }

           leaf attributes {
             type bits {
               bit OVERLOAD {
                 description
                  "If set, the originator is overloaded,
                   and must be avoided in path
                   calculation.";
               }
               bit ATTACHED {



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                 description
                  "If set, the originator is attached to
                   another area using the referred metric.";
               }
             }
             description
              "This leaf describes attributes of the LSP
               for the associated topology.";
           }
           description
            "List of topologies supported.";
         }
         description
          "This container describes the topology supported.
          ISIS reference is TLV 229.";
       }

       leaf-list ipv6-addresses {
         type inet:ipv6-address;
         description
          "This leaf describes the IPv6 interface
          addresses of the node.
          ISIS reference is TLV 232.";
       }




       container mt-extended-ipv4-reachability {
         list prefixes {
           leaf MT-ID {
             type uint16 {
               range "0 .. 4095";
             }
             description
              "This leaf defines the identifier
               of a topology.";
           }
           uses prefix-ipv4-extended;
           description
            "List of prefixes.";

         }
         description
          "This container describes list of IPv4
          reachability information in multi-topology
          environment.
          ISIS reference is TLV 235.";



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       }

       container mt-ipv6-reachability {
         list prefixes {
           leaf MT-ID {
             type uint16 {
               range "0 .. 4095";
             }
             description
              "This leaf defines the identifier
               of a topology.";
           }
           uses prefix-ipv6-extended;
           description
            "List of prefixes.";
         }
         description
          "This container describes list of IPv6
          reachability information in multi-topology
          environment.
          ISIS reference is TLV 237.";
       }

       container ipv6-reachability {
         list prefixes {
           uses prefix-ipv6-extended;
           description
            "List of prefixes.";
         }
         description
          "This container describes list of IPv6
          reachability information.
          ISIS reference is TLV 236.";
       }



       list router-capabilities {
         leaf flags {
           type bits {
             bit flooding {
               position 0;
               description
                "If the S bit is set(1),
                the IS-IS Router CAPABILITY TLV
               MUST be flooded across the entire routing domain.
               If the S bit is
               not set(0), the TLV MUST NOT be leaked between levels.



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               This bit MUST NOT be altered during the TLV leaking.";
             }
             bit down {
               position 1;
               description
               "When the IS-IS Router CAPABILITY TLV is
               leaked from level-2 to level-1, the D bit
               MUST be set.  Otherwise, this bit MUST
               be clear.  IS-IS Router capability TLVs
               with the D bit set MUST NOT
               be leaked from level-1 to level-2.
               This is to prevent TLV looping.
               ";
             }
           }
           description
            "Flags associated with router capability.";
         }
         container node-tag {
           if-feature node-tag;
           list node-tag {
             leaf tag {
               type uint32;
               description
                "Node tag value.";
             }
             description
              "List of tags.";
           }
           description
            "Container for node tags.";
         }

         leaf binary {
           type binary;
           description
            "This leaf describes the capability of the node.
            Format is binary according to the protocol encoding.";
         }
         description
          "This container describes the capabilities of the node.
          This container may be extended with detailed
          information.
          ISIS reference is TLV 242.";
       }
     }

     grouping isis-node-tag-cfg {



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       description
        "ISIS node tag config.";
       container node-tag {
           if-feature node-tag;
           list node-tag {
             key tag;
             leaf tag {
               type uint32;
               description
                "Node tag value.";
             }
             description
              "List of tags.";
           }
           description
             "Container for node tags.";
         }
     }

     grouping isis-global-cfg {
       description
        "Defines the ISIS global configuration.";


           uses admin-control;

           leaf level-type {
             type level;
             default "level-all";
             description
              "This leaf describes the type of ISIS node.
              A node can be level-1-only, level-2-only
              or level-1-2.
              ";
           }

           leaf system-id {
             type system-id;
             description
              "This leaf defines the system-id of the node.";
           }


           leaf maximum-area-addresses {
             if-feature maximum-area-addresses;
             type uint8;
             default 3;
             description



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              "Defines the maximum areas supported.";
           }

           leaf-list area-address {
             type area-address;
             description
              "List of areas supported by the
              protocol instance.";
           }

           container mpls {
             leaf ipv4-router-id {
               if-feature ipv4-router-id;
               type inet:ipv4-address;
               description
                "Router ID value that would be used in
                TLV 134.";
             }
             leaf ipv6-router-id {
               if-feature ipv6-router-id;
               type inet:ipv6-address;
               description
                "Router ID value that would be used in
                TLV 140.";
             }
             container igp-ldp-sync {
               if-feature igp-ldp-sync;
               description
                 "This container may be augmented
                 with global parameters for igp-ldp-sync.";
             }
             description
               "This container handles mpls config.";
           }
           leaf reference-bandwidth {
             if-feature reference-bandwidth;
             type uint32;
             units "bps";
             description
              "This leaf defines the bandwidth for calculating
               metric.";
           }

           leaf lsp-mtu {
             type uint16;
             units "bytes";
             default 1492;
             description



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              "This leaf describes the maximum size of a
               LSP PDU in bytes.";
           }
           leaf lsp-lifetime {
             type uint16;
             units "seconds";
             description
              "This leaf describes the lifetime of the router
               LSP in seconds.";
           }
           leaf lsp-refresh {
             if-feature lsp-refresh;
             type uint16;
             units "seconds";
             description
              "This leaf describes the refresh interval of the
               router LSP in seconds.";
           }

           container graceful-restart {
             if-feature graceful-restart;
             leaf enable {
               type boolean;
               description
                "Control enabling the feature.";
             }
             description
              "This container activates graceful restart.";
           }

           uses isis-node-tag-cfg;

           list authentication {
             key level;

             choice authentication-type {
               case key-chain {
                 if-feature key-chain;
                 leaf key-chain {
                   type key-chain:key-chain-ref;
                   description
                     "Reference to a key-chain.";
                 }
               }
               case password {
                 leaf key {
                   type string;
                   description



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                    "This leaf describes the
                      authentication key.";
                 }
                 uses key-chain:crypto-algorithm-types;
               }
               description
                  "Choice of authentication.";
             }
             leaf level {
               type level;
               description
                 "Level applicability.";
             }
             description
              "Container for ISIS authentication.
               It covers both LSPs and SNPs.";
           }



           list metric-type {
             key level;

             leaf value {
               type enumeration {
                 enum wide-only {
                   description
                    "Advertise new metric style only
                    (RFC5305)";
                 }
                 enum old-only {
                   description
                    "Advertise old metric style only
                    (RFC1195)";
                 }
                 enum both {
                   description "Advertise both metric
                   styles";
                 }
               }
               description
                "This leaf describes the type of metric
                to be generated.
                Wide-only means only new metric style
                is generated,
                old-only means that only old style metric
                is generated,
                and both means that both are advertised.



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                This leaf is only affecting IPv4 metrics.";
             }
             leaf level {
               type level;
               description
                 "Level applicability.";
             }
             description
              "Metric style container.";
           }
           list preference {
             key level;

             choice granularity {
               case detail {
                 leaf internal {
                   type uint8;
                   description
                     "This leaf defines the protocol
                      preference for internal routes.";
                 }
                 leaf external {
                   type uint8;
                   description
                     "This leaf defines the protocol
                      preference for external routes.";
                 }
               }
               case coarse {
                 leaf default {
                   type uint8;
                   description
                     "This leaf defines the protocol
                      preference for all ISIS routes.";
                 }
               }
               description
                "Choice for implementation of route preference.";
             }

             leaf level {
               type level;
               description
                 "Level applicability.";
             }
             description
                "This leaf defines the protocol preference.";
           }



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           list default-metric {
             key level;

             leaf value {
               type wide-metric;
               description
                 "Value of the metric";
             }
             leaf level {
               type level;
               description
                 "Level applicability of the metric.";
             }
             description
              "Defines the metric to be used by default.";
           }
           list af {
             if-feature nlpid-control;
             key af;
             leaf af {
               type identityref {
                 base rt:address-family;
               }
               description
                "Address-family";
             }

             leaf enable {
               type boolean;
               description
                 "Describes the activation state of the
                  AF.";
             }
             description
              "This list permits activation
              of new address families.";

           }

           list overload {
             key level;

             leaf status {
               type boolean;
               description
                "This leaf defines the overload status.";
             }




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             leaf timeout {
               type uint16;
               units "seconds";
               description
                "This leaf defines the timeout in seconds
                 of the overload condition.";
             }
             leaf level {
               type level;
               description
                 "Level applicability of the metric.";
             }
             description
              "This leaf describes if the router is
               set to overload state.";
           }

           list overload-max-metric {
             if-feature overload-max-metric;
             key level;

             leaf status {
               type boolean;
               description
                "This leaf defines the overload status.";
             }

             leaf timeout {
               type uint16;
               units "seconds";
               description
                "This leaf defines the timeout in seconds
                 of the overload condition.";
             }
             leaf level {
               type level;
               description
                 "Level applicability of the metric.";
             }
             description
              "This leaf describes if the router is
               set to overload state.";
           }

     }

     grouping isis-global-topologies-cfg {
      description



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       "Per topology config.";
       list default-metric {
           key level;

           leaf value {
             type wide-metric;
             description
               "Value of the metric";
           }
           leaf level {
             type level;
             description
               "Level applicability of the metric.";
           }
           description
            "Defines the metric to be used by default.";
         }
         uses isis-node-tag-cfg;
     }



     grouping isis-if-cfg {
       description
        "Grouping for interface cfg.";

       leaf level-type {
         type level;
         default "level-all";
         description
          "This leaf defines the associated ISIS
          level of the interface.";
       }
       leaf lsp-pacing-interval {
         type uint16;
         units "milliseconds";
         description
          "This leaf defines the interval between
           LSP transmissions in milli-seconds";
       }
       leaf lsp-retransmit-interval {
         type uint16;
         units "seconds";
         description
          "This leaf defines the interval between
          retransmission of LSP";
       }
       leaf passive {



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         type boolean;
         default "false";
         description
          "This leaf defines if interface is in
           passive mode (ISIS not running,
           but network is advertised).";
       }
       leaf csnp-interval {
         type uint16;
         units "seconds";
         description
          "This leaf defines the interval of CSNP
           messages.";
       }

       container hello-padding {
         leaf enable {
           type boolean;
           default "true";
           description
            "Status of Hello-padding activation.
             By default, the implementation shall
             pad HELLOs.";
         }

         description
          "This container handles ISIS hello padding
           configuration.";
       }

       leaf mesh-group-enable {
         type mesh-group-state;
         description
          "Describes the mesh group state of
           the interface.";
       }


       leaf mesh-group {
         when "../mesh-group-enable = meshSet" {
           description
            "Only valid when mesh-group-enable
             equals meshSet";
         }
         type uint8;
         description
          "Describes the mesh group ID of
           the interface.";



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       }

       leaf interface-type {
         type interface-type;
         description
          "This leaf defines the type of adjacency
          to be established on the interface.
          This is affecting the type of hello
          message that would be used.";
       }

       uses admin-control;

       leaf-list tag {
         if-feature prefix-tag;

         type uint32;
         description
          "This leaf defines list of tags associated
           with the interface.";
       }

       leaf-list tag64 {
         if-feature prefix-tag64;

         type uint64;
         description
          "This leaf defines list of 64bits tags
          associated with the interface.";
       }

       list hello-authentication {
         key level;

         choice authentication-type {
           case key-chain {
             if-feature key-chain;
             leaf key-chain {
               type key-chain:key-chain-ref;
               description
                 "Reference to a key-chain.";
             }
           }
           case password {
             leaf key {
               type string;
               description
                "This leaf describes the



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                  authentication key.";
             }
             uses key-chain:crypto-algorithm-types;
           }
           description
              "Choice of authentication.";
         }
         leaf level {
           type level;
           description
             "Level applicability.";
         }
         description
          "This leaf describes the authentication type
          to be used in hello messages.";
       }

       list hello-interval {
         key level;

         leaf value {
           type uint16;
           units "seconds";
           description
            "This leaf defines the interval of
            hello messages.";
         }
         leaf level {
           type level;
           description
             "Level applicability.";
         }
         description
            "This leaf defines the interval of
            hello messages.";
       }
       list hello-multiplier {
         key level;

         leaf value {
           type uint16;
           description
            "This leaf defines the number of
            hello failed to be received before
            declaring the adjacency down.";
         }
         leaf level {
           type level;



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           description
             "Level applicability.";
         }
         description
            "This leaf defines the number of
             hello failed to be received before
             declaring the adjacency down.";
       }


       list priority {
         must 'interface-type = "broadcast"' {
           error-message
            "Priority only applies to broadcast
            interfaces.";
           description
            "Check for broadcast interface.";
         }
         key level;
         leaf value {
           type uint8 {
             range "0 .. 127";
           }

           description
            "This leaf describes the priority of
            the interface
            for DIS election.";
         }
         leaf level {
           type level;
           description
             "Level applicability.";
         }
         description
            "This leaf describes the priority of
            the interface
            for DIS election.";
       }
       list metric {
         key level;

         leaf value {
           type wide-metric;
           description
            "Metric value.";
         }
         leaf level {



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           type level;
           description
             "Level applicability.";
         }
         description
          "Container for interface metric";
       }

       list af {
         key af;

         leaf af {
           type identityref {
             base rt:address-family;
           }
           description
             "Address-family";
         }
         container bfd {
           if-feature bfd;
           leaf enable {
             type boolean;
             default false;
             description
              "This leaf enables BFD.";
           }

           description
             "The container describes
              BFD config.";
         }

         description
          "List of AFs.";
       }



       container mpls {
         container igp-ldp-sync {
           if-feature igp-ldp-sync;
           leaf enable {
             type boolean;
             description
              "Enable/disable IGP LDP sync.";
           }
           description
            "IGP-LDP sync configuration.";



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         }
         description
          "Container for MPLS specific configuration
          for ISIS.";
       }

     }

     grouping isis-if-topologies-cfg {
       description
        "ISIS interface topology cfg.";
       list metric {
           key level;

           leaf value {
             type wide-metric;
             description
              "Metric value.";
           }
           leaf level {
             type level;
             description
               "Level applicability.";
           }
           description
            "Container for interface metric";
       }
     }



     /* */

     augment "/rt:routing-state/rt:ribs/rt:rib/rt:routes/rt:route" {
       when "rt:source-protocol = 'isis:isis'" {
         description "ISIS-specific route attributes.";
       }
       uses route-content;
       description
        "This augments route object in RIB with ISIS-specific
         attributes.";
       }

     augment "/rt:active-route/rt:output/rt:route"
        {
       uses route-content;
       description "ISIS-specific route attributes.";
       }



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     augment "/if:interfaces/if:interface"
        {
       leaf clns-mtu {
         type uint16;
         description
          "Defines CLNS MTU of the interface.";
       }
       description "ISO interface config.";
       }


     augment "/rt:routing/rt:routing-instance/rt:routing-protocols/"
         +"rt:routing-protocol" {
       when "rt:type = 'isis:isis'" {
         description
          "This augment is only valid when routing protocol
           instance type is isis.";
       }
       description
        "This augments a routing protocol instance with ISIS
         specific parameters.";
       container isis {

           must "count(area-address) > 0" {
             error-message "At least one area-address
             must be configured.";
             description
              "Enforce configuration of at least one area.";
           }

           uses isis-global-cfg;

           container fast-reroute {
            if-feature fast-reroute;
            uses fast-reroute-global-cfg;
            description
                 "IPFRR.";
           }
           list topologies {
             if-feature multi-topology;

             key "name";

             leaf enable {
               type boolean;
               description
                "Control enabling of topologies";
             }



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             leaf name {
               type rt:rib-ref;
               description "RIB";
             }

             uses isis-global-topologies-cfg;
             container fast-reroute {
              if-feature fast-reroute;
              uses fast-reroute-global-cfg;
              description
                 "IPFRR.";
             }

             description
               "List of topologies";
           }

           container interfaces {
             list interface {
               key "name";
               leaf name {
                 type if:interface-ref;

                 description
                  "Reference to the interface within
                   the routing-instance.";
               }

             uses isis-if-cfg;
             container fast-reroute {
               if-feature fast-reroute;
               uses fast-reroute-if-cfg;
               description
                 "IPFRR.";
             }
             list topologies {
                 key name;

                 leaf name {
                   type rt:rib-ref;
                   description
                    "Name of RIB.";
                 }
                 container fast-reroute {
                   if-feature fast-reroute;
                   uses fast-reroute-if-cfg;
                   description
                    "IPFRR.";



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                 }
                 uses isis-if-topologies-cfg;
                 description
                  "List of topologies.";
             }
             description
               "List of ISIS interfaces.";
             }
             description
              "This container defines ISIS interface specific
              configuration objects.";
           }

         description
          "This container defines ISIS specific configuration
           objects.";
       }
     }

     augment "/rt:routing-state/rt:routing-instance/"
       +"rt:routing-protocols/rt:routing-protocol" {
       when "rt:type = 'isis:isis'" {
         description
          "This augment is only valid when routing protocol
           instance type is isis.";
       }
       description
        "This augments routing protocol instance states with ISIS
         specific parameters.";

       container isis {
         config false;
           uses isis-global-cfg;
           container fast-reroute {
             if-feature fast-reroute;
             uses fast-reroute-global-cfg;
             uses fast-reroute-global-state;
             description
              "IPFRR states.";
           }

           list topologies {
             key name;

             leaf name {
               type rt:rib-ref;
               description
                 "Name of RIB.";



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             }
             container fast-route {
               if-feature fast-reroute;
               uses fast-reroute-global-cfg;
               uses fast-reroute-global-state;
               description
                 "IPFRR states.";
             }
             description
              "List of topologies.";
           }

           container system-counters {
             list level {
               key level;

               leaf level {
                 type level-number;
                 description
                  "This leaf describes the ISIS level.";
               }
               leaf corrupted-lsps {
                 type uint32;
                 description
                  "Number of corrupted in-memory LSPs detected.
                  LSPs received from the wire with a bad
                  checksum are silently dropped and not counted.
                  LSPs received from the wire with parse errors
                  are counted by lsp-errors.";
               }
               leaf authentication-type-fails {
                 type uint32;
                 description
                  "Number of authentication type mismatches.";
               }
               leaf authentication-fails {
                 type uint32;
                 description
                  "Number of authentication key failures.";
               }
               leaf database-overload {
                 type uint32;
                 description
                  "Number of times the database has become
                  overloaded.";
               }
               leaf own-lsp-purge {
                 type uint32;



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                 description
                  "Number of times a zero-aged copy of the
                  system's own LSP is received from some
                  other node.";
               }
               leaf manual-address-drop-from-area {
                 type uint32;
                 description
                  "Number of times a manual address
                   has been dropped from the area.";
               }
               leaf max-sequence {
                 type uint32;
                 description
                  "Number of times the system has attempted
                   to exceed the maximum sequence number.";
               }
               leaf sequence-number-skipped {
                 type uint32;
                 description
                  "Number of times a sequence number skip has
                  occured.";
               }
               leaf id-len-mismatch {
                 type uint32;
                 description
                  "Number of times a PDU is received with
                   a different value for ID field length
                   from that of the receiving system.";
               }
               leaf partition-changes {
                 type uint32;
                 description
                  "Number of partition changes detected.";
               }
               leaf lsp-errors {
                 type uint32;
                 description
                  "Number of LSPs with errors we have
                  received.";
               }
               leaf spf-runs {
                 type uint32;
                 description
                  "Number of times we ran SPF at this level.";
               }
               description
                "List of supported levels.";



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             }
             description
              "The container defines a list of counters
               for the IS.";
           }

           container interfaces {
             list interface {
               key interface;

               leaf interface {
                 type string;
                 description
                  "This leaf describes the name
                  of the interface.";
               }
               uses isis-if-cfg;
               container fast-reroute {
                if-feature fast-reroute;
                uses fast-reroute-if-cfg;
                description
                 "IPFRR.";
               }
               uses adjacency-state;

               list topologies {
                 key name;

                 leaf name {
                   type rt:rib-ref;
                   description
                     "Name of RIB.";
                 }
                 uses isis-if-topologies-cfg;
                 container fast-reroute {
                  if-feature fast-reroute;
                  uses fast-reroute-if-cfg;
                  description
                   "IPFRR.";
                 }
                 uses adjacency-state;



                 description
                  "List of topologies.";
               }




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               container event-counters {
                 leaf adjacency-changes {
                   type uint32;
                   description
                    "The number of times an adjacency state
                     change has occured on this interface.";
                 }
                 leaf adjacency-number {
                   type uint32;
                   description
                    "The number of adjacencies on this
                     interface.";
                 }
                 leaf init-fails {
                   type uint32;
                   description
                    "The number of times initialization of
                     this interface has failed. This counts
                     events such as PPP NCP failures.
                     Failures to form an adjacency are counted
                     by adjacency-rejects.";
                 }
                 leaf adjacency-rejects {
                   type uint32;
                   description
                    "The number of times an adjacency has been
                     rejected on this interface.";
                 }
                 leaf id-len-mismatch {
                   type uint32;
                   description
                    "The number of times an IS-IS PDU with an ID
                     field length different from that for this
                     system has been received on this interface.";
                 }
                 leaf max-area-addresses-mismatch {
                   type uint32;
                   description
                    "The number of times an IS-IS PDU with
                     according max area address field
                     differs from that for
                     this system has been received on this
                     interface.";
                 }
                 leaf authentication-type-fails {
                   type uint32;
                   description
                    "Number of authentication type mismatches.";



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                 }
                 leaf authentication-fails {
                   type uint32;
                   description
                    "Number of authentication key failures.";
                 }
                 leaf lan-dis-changes {
                   type uint32;
                   description
                    "The number of times the DIS has changed
                     on this interface at this level.
                     If the interface type is point to point,
                     the count is zero.";
                 }
                 description
                  "Provides protocol event counters.";
               }
               container packet-counters {
                 list level {
                   key level;

                   leaf level {
                     type level-number;
                     description
                      "This leaf describes the ISIS level.";
                   }

                   container iih {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {
                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of IIH PDUs received/sent.";
                   }
                   container ish {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {



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                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of ISH PDUs received/sent.";
                   }
                   container esh {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {
                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of ESH PDUs received/sent.";
                   }
                   container lsp {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {
                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of LSP PDUs received/sent.";
                   }
                   container psnp {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {
                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of PSNP PDUs received/sent.";



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                   }
                   container csnp {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {
                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of CSNP PDUs received/sent.";
                   }
                   container unknown {
                     leaf in {
                       type uint32;
                       description
                        "Received PDUs.";
                     }
                     leaf out {
                       type uint32;
                       description
                        "Sent PDUs.";
                     }
                     description
                      "The number of unknown PDUs received/sent.";
                   }
                   description
                    "List of supported levels.";
                 }
                 description
                  "Provides packet counters per level.";
               }
               description
                "List of interfaces.";
             }
             description
              "The container defines operational parameters
               of interfaces.";
           }

           container spf-log {
             list event {
               key id;

               leaf id {



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                 type uint32;
                 description
                  "This leaf defines the event identifier.
                   This is a purely internal value.";
               }
               leaf spf-type {
                 type enumeration {
                   enum full {
                     description
                      "Computation done is a Full SPF.";
                   }
                   enum incremental {
                     description
                      "Computation done is an
                       incremental SPF.";
                   }
                   enum route-only {
                     description
                      "Computation done is a
                       reachability computation
                       only.";
                   }
                 }
                 description
                  "This leaf describes the type of computation
                  used.";
               }
               leaf level {
                 type level-number;
                 description
                  "This leaf describes the level affected by the
                  the computation.";
               }
               leaf spf-delay {
                 type uint32;
                 units "milliseconds";
                 description
                  "This leaf describes the SPF delay that
                  was used for this event.";
               }
               leaf schedule-timestamp {
                 type yang:timestamp;
                 description
                  "This leaf describes the timestamp
                   when the computation was scheduled.";
               }
               leaf start-timestamp {
                 type yang:timestamp;



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                 description
                  "This leaf describes the timestamp
                   when the computation was started.";
               }
               leaf end-timestamp {
                 type yang:timestamp;
                 description
                  "This leaf describes the timestamp
                   when the computation was ended.";
               }
               list trigger-lsp {
                 key "lsp";
                 leaf lsp {
                   type lsp-id;
                   description
                    "This leaf describes the LSPID
                     of the LSP.";
                 }
                 leaf sequence {
                   type uint32;
                   description
                    "This leaf describes the sequence
                     number of the LSP.";
                 }
                 description
                  "This leaf describes list of LSPs
                   that triggered the computation.";
               }
               description
                "List of computation events.";
             }

             description
              "This container lists the SPF computation events.";
           }
           container lsp-log {
             list event {
               key id;

               leaf id {
                 type uint32;
                 description
                  "This leaf defines the event identifier.
                   This is a purely internal value.";
               }
               leaf level {
                 type level-number;
                 description



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                  "This leaf describes the level affected by the
                  the computation.";
               }
               container lsp {
                 leaf lsp {

                   type lsp-id;
                   description
                    "This leaf describes the LSPID
                     of the LSP.";
                 }
                 leaf sequence {
                   type uint32;
                   description
                    "This leaf describes the sequence
                     number of the LSP.";
                 }
                 description
                  "This container describes the received LSP
                  , in case of local LSP update the local
                  LSP ID is referenced.";
               }

               leaf received-timestamp {
                 type yang:timestamp;

                 description
                  "This leaf describes the timestamp
                  when the LSP was received. In case of
                  local LSP update, the timestamp refers
                  to the local LSP update time.";
               }

               leaf change {
                 type bits {
                   bit refresh {
                     position 0;
                     description
                      "Refresh LSP, nothing has changed.";
                   }
                   bit link-down {
                     position 1;
                     description
                      "One or more links are down.";
                   }
                   bit link-up {
                     position 2;
                     description



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                      "One or more links are up.";
                   }
                   bit link-metric-change {
                     position 3;
                     description
                      "One or more links experienced
                      a metric change.";
                   }
                   bit link-other-change {
                     position 4;
                     description
                      "One or more links experienced
                      a change that does not affect state
                      or metric.";
                   }
                   bit prefix-down {
                     position 5;
                     description
                      "One or more links are down.";
                   }
                   bit prefix-up {
                     position 6;
                     description
                      "One or more prefixes are up.";
                   }
                   bit prefix-metric-change {
                     position 7;
                     description
                      "One or more prefixes experienced
                      a metric change.";
                   }
                   bit prefix-other-change {
                     position 8;
                     description
                      "One or more prefixes experienced
                      a change that does not affect state
                      or metric.";
                   }
                   bit other-change {
                     position 9;
                     description
                      "One or more component changed that
                      is not a prefix or link.";
                   }
                 }
                 description
                  "This leaf describes the type of change
                  in the LSP.";



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               }

               description
                "List of LSP events.";
             }

             description
              "This container lists the LSP reception events.
              Local LSP modification are also contained in the
              list.";
           }
           container database {
             list level-db {
               key level;

               leaf level {
                 type level-number;
                 description
                  "Current level number";
               }
               list lsp {
                 key lsp-id;

                 uses database;
                 description
                  "List of LSPs in LSDB.";
               }

               description
                "This container describes the list of LSPs
                in the level x database.";
             }

             description
              "This container describes ISIS Link State
               databases.";
           }
           container hostnames {

             list hostname {
               key system-id;
               leaf system-id {
                 type system-id;
                 description
                  "This leaf describes the system-id
                  associated with the hostname.";
               }
               leaf hostname {



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                 type string;
                 description
                  "This leaf describes the hostname
                   associated with the system ID.";
               }
               description
                "List of system-id/hostname associations";
             }

             description
              "This container describes the list
              of binding between system-id and
              hostnames.";
           }

         description
            "This container defines various ISIS states objects.";
       }
     }

     /* RPC methods */

     rpc clear-adjacency {
       description
        "This RPC request clears a particular
         set of ISIS adjacencies. If the operation
         fails for ISIS internal reason, then
         error-tag and error-app-tag should be set
         to a meaningful value.";
       input {
                       leaf routing-instance-name {
           type rt:routing-instance-state-ref;
           mandatory "true";
           description
            "Name of the routing instance whose ISIS
             information is being queried.

             If the routing instance with name equal to the
             value of this parameter doesn't exist, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag 'routing-instance-not-found'.";


         }
         leaf routing-protocol-instance-name {
           type instance-state-ref;
           mandatory "true";
           description



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            "Name of the ISIS protocol instance whose ISIS
             information is being queried.

             If the ISIS instance with name equal to the
             value of this parameter doesn't exist, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag
             'routing-protocol-instance-not-found'.";
         }
         leaf level {
           type level;
           description
            "ISIS level of the adjacency to be cleared.
            If ISIS level is level-1-2, both level 1 and level 2
            adjacencies would be cleared.

            If the value provided is different from the one
            authorized in the enum type, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag
             'bad-isis-level'.
            ";
         }
         leaf interface {
           type string;
           description
            "Name of the ISIS interface.

             If the ISIS interface with name equal to the
             value of this parameter doesn't exist, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag
             'isis-interface-not-found'.";
         }
       }
     }

     rpc clear-database {
       description
        "This RPC request clears a particular
         ISIS database. If the operation
         fails for ISIS internal reason, then
         error-tag and error-app-tag should be set
         to a meaningful value.";
       input {
         leaf routing-instance-name {
           type rt:routing-instance-state-ref;
           mandatory "true";



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           description
            "Name of the routing instance whose ISIS
             information is being queried.

             If the routing instance with name equal to the
             value of this parameter doesn't exist, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag 'routing-instance-not-found'.";


         }
         leaf routing-protocol-instance-name {
           type instance-state-ref;
           mandatory "true";
           description
            "Name of the ISIS protocol instance whose ISIS
             information is being queried.

             If the ISIS instance with name equal to the
             value of this parameter doesn't exist, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag
             'routing-protocol-instance-not-found'.";
         }
         leaf level {
           type level;
           description
            "ISIS level of the adjacency to be cleared.
            If ISIS level is level-1-2, both level 1 and level 2
            adjacencies would be cleared.

            If the value provided is different from the one
            authorized in the enum type, then this
             operation SHALL fail with error-tag 'data-missing'
             and error-app-tag
             'bad-isis-level'.
            ";
         }
       }

     }



     /* Notifications */

     notification database-overload {
       uses notification-instance-hdr;



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       leaf overload {
         type enumeration {
           enum "off" {
             description
              "The system has left overload condition.";
           }
           enum "on" {
             description
              "The system is in overload condition.";
           }

         }
         description
            "Describes the new overload state of the instance.";
       }
       description
         "This notification is sent when an ISIS instance
          overload condition changes.";
     }

     notification lsp-too-large {
       uses notification-instance-hdr;
       uses notification-interface-hdr;

       leaf pdu-size {
         type uint32;
         description
          "Size of the PDU";
       }
       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       description
         "This notification is sent when we attempt
          to propagate an LSP that is larger than the
          dataLinkBlockSize for the circuit.
          The notification generation must be throttled
          with at least a 5 second gap.
          ";
     }

     notification corrupted-lsp-detected {
       uses notification-instance-hdr;
       leaf lsp-id {
         type lsp-id;
         description



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          "LSP ID.";
       }
       description
         "This notification is sent when we find
          that an LSP that was stored in memory has
          become corrupted.
          ";
     }

     notification attempt-to-exceed-max-sequence {
       uses notification-instance-hdr;
       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       description
         "This notification is sent when the system
         wraps the 32-bit sequence counter of an LSP.
          ";
     }

     notification id-len-mismatch {
       uses notification-instance-hdr;
       uses notification-interface-hdr;

       leaf pdu-field-len {
         type uint8;
         description
          "Size of the ID length in the received PDU";
       }
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       description
         "This notification is sent when we receive a PDU
         with a different value for the System ID length.
         The notification generation must be throttled
         with at least a 5 second gap.
          ";
     }

     notification max-area-addresses-mismatch {
       uses notification-instance-hdr;
       uses notification-interface-hdr;




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       leaf max-area-addresses {
         type uint8;
         description
          "Received number of supported areas";
       }
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       description
         "This notification is sent when we receive a PDU
         with a different value for the Maximum Area Addresses.
         The notification generation must be throttled
         with at least a 5 second gap.
          ";
     }

     notification own-lsp-purge {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       description
         "This notification is sent when the system
         receives a PDU with its own system ID and zero age.
          ";
     }

     notification sequence-number-skipped {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       description
         "This notification is sent when the system
         receives a PDU with its own system ID and
         different contents. The system has to reissue
         the LSP with a higher sequence number.
          ";
     }




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     notification authentication-type-failure {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       description
         "This notification is sent when the system
         receives a PDU with the wrong authentication type
         field.
         The notification generation must be throttled with
         at least a 5 second gap.
          ";
     }

     notification authentication-failure {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       description
         "This notification is sent when the system
         receives a PDU with the wrong authentication
         information.
         The notification generation must be throttled with
         at least a 5 second gap.
          ";
     }

     notification version-skew {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf protocol-version {
         type uint8;
         description
          "Protocol version received in the PDU.";
       }
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       description



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         "This notification is sent when the system
         receives a PDU with a different protocol version
         number.
         The notification generation must be throttled with at least
          a 5 second gap.
          ";
     }

     notification area-mismatch {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       description
         "This notification is sent when the system
         receives a Hello PDU from an IS that does
         not share any area address.
         The notification generation must be throttled with at least
          a 5 second gap.
          ";
     }

     notification rejected-adjacency {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       leaf reason {
         type string;
         description
          "The system may provide a reason to reject the
           adjacency. If the reason is not available,
           the system use an empty string.";
       }
       description
         "This notification is sent when the system
         receives a Hello PDU from an IS but does not
         establish an adjacency for some reason.
         The notification generation must be throttled with at least
          a 5 second gap.
          ";
     }



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     notification protocols-supported-mismatch {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       leaf-list protocols {
         type uint8;
         description
          "The list of protocols supported by the
           remote system.";
       }
       description
         "This notification is sent when the system
         receives a non pseudonode LSP that has no matching
         protocol supported.
         The notification generation must be throttled with at least
          a 5 second gap.
          ";
     }

     notification lsp-error-detected {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       leaf raw-pdu {
         type binary;
         description
          "Received raw PDU.";
       }
       leaf error-offset {
         type uint32;
         description
          "If the problem is a malformed TLV,
          the error-offset points to the start of the TLV.
          If the problem is with the LSP header,
          the error-offset points to the suspicious byte";
       }
       leaf tlv-type {
         type uint8;
         description
          "if the problem is a malformed TLV, the tlv-type is set



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          to the type value of the suspicious TLV.
          Otherwise this leaf is not present.";
       }
       description
         "This notification is sent when the system
         receives a  LSP with a parse error.
         The notification generation must be throttled with at least
          a 5 second gap.
          ";
     }

     notification adjacency-change {
       uses notification-instance-hdr;
       uses notification-interface-hdr;
       leaf neighbor {
         type string;
         description
          "Describes the name of the neighbor. If the
          name of the neighbor is not available, the
          field would be empty.";
       }
       leaf neighbor-system-id {
         type system-id;
         description
          "Describes the system-id of the neighbor.";
       }
       leaf level {
         type level;
         description
          "Describes the ISIS level of the adjacency.";
       }
       leaf state {
         type enumeration {
           enum "Up" {
             description
              "This state describes that
               adjacency is established.";
           }
           enum "Down" {
             description
              "This state describes that
               adjacency is no more established.";
           }
         }
         description
          "This leaf describes the new state of the
           ISIS adjacency.";
       }



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       leaf reason {
         type string;
         description
          "If the adjacency is going to DOWN,
          this leaf provides a reason for the adjacency
          going down. The reason is provided as a text.
          If the adjacency is going to UP, no reason is
          provided.";
       }
       description
         "This notification is sent when an ISIS adjacency
          moves to Up state or to Down state.";
     }

     notification lsp-received {
       uses notification-instance-hdr;
       uses notification-interface-hdr;

       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       leaf sequence {
         type uint32;
         description
          "Sequence number of the received LSP.";
       }
       leaf received-timestamp {
         type yang:timestamp;

         description
          "This leaf describes the timestamp
          when the LSP was received. ";
       }
       leaf neighbor-system-id {
         type system-id;
         description
          "Describes the system-id of the neighbor
          that sent the LSP.";
       }
       description
         "This notification is sent when a LSP
         is received.
         The notification generation must be throttled with at least
          a 5 second gap. ";
     }




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     notification lsp-generation {
       uses notification-instance-hdr;

       leaf lsp-id {
         type lsp-id;
         description
          "LSP ID.";
       }
       leaf sequence {
         type uint32;
         description
          "Sequence number of the received LSP.";
       }
       leaf send-timestamp {
         type yang:timestamp;

         description
          "This leaf describes the timestamp
          when our LSP was regenerated. ";
       }
       description
         "This notification is sent when a LSP
         is regenerated.
         The notification generation must be throttled with at least
          a 5 second gap. ";
     }


   }

   <CODE ENDS>

8.  ISIS Segment Routing YANG Module

   <CODE BEGINS> file "ietf-isis-sr@2015-06-23.yang"

   module ietf-isis-sr {
     namespace "urn:ietf:params:xml:ns:"
             + "yang:ietf-isis-sr";
     prefix isis-sr;

     import ietf-inet-types {
       prefix "inet";
     }

     import ietf-routing {
       prefix "rt";
     }



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     import ietf-interfaces {
     prefix "if";
     }

     import ietf-segment-routing {
       prefix "sr";
     }

     import ietf-isis {
       prefix "isis";
     }

     organization
      "IETF ISIS Working Group";

     contact
       "WG List:  &lt;mailto:spring@ietf.org&gt;

       Editor:    Stephane Litkowski
             &lt;mailto:stephane.litkowski@orange.com&gt;

           Acee Lindem
             &lt;mailto:acee@cisco.com&gt;
           Yingzhen Qu
             &lt;mailto:yiqu@cisco.com&gt;
           Pushpasis Sarkar
             &lt;mailto:psarkar@juniper.net&gt;
           Ing-Wher Chen
             &lt;mailto:ing-wher.chen@ericsson.com&gt;
           Jeff Tantsura
             &lt;mailto:jeff.tantsura@ericsson.com&gt;

       ";

     description
       "The YANG module defines a generic configuration model for
       Segment routing ISIS extensions common across all of the vendor
       implementations.";

     revision 2015-05-27 {
       description "
        * Initialization
       ";
       reference "";
     }


     /* Identities */



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     /* Features */



     /* Groupings */

   grouping adjacency-state {
       description
        "This group will extend adjacency state.";
       list adjacency-sid {
         key value;
         leaf af {
           type identityref {
             base rt:address-family;
           }
           description
            "Address-family associated with the
            segment ID";
         }
         leaf value {
           type uint32;
           description
            "Value of the Adj-SID.";
         }
         leaf weight {
           type uint8;
           description
            "Weight associated with
            the adjacency SID.";
         }
         leaf protection-requested {
           type boolean;
           description
            "Describe if the adjacency SID
            must be protected.";
         }
         description
          "List of adjacency Segment IDs.";
       }
   }

   grouping prefix-segment-id {
       description
        "This group defines segment routing extensions
        for prefixes.";

       list sid-list {
         key value;



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         leaf flags {
           type bits {
             bit readvertisment {
               position 7;
               description
                "If set, then the prefix to
               which this Prefix-SID is attached,
               has been propagated by the
               router either from another level
               or from redistribution.";
             }

             bit php {
               position 5;
               description
               "If set, then the penultimate hop MUST NOT
               pop the Prefix-SID before delivering the packet
               to the node
               that advertised the Prefix-SID.";
             }
             bit explicit-null {
               position 4;
               description
               "If set, any upstream neighbor of
               the Prefix-SID originator MUST replace
               the Prefix-SID with a
               Prefix-SID having an
               Explicit-NULL value (0 for IPv4 and 2 for
               IPv6) before forwarding the packet.";
             }
             bit  value {
               position 3;
               description
               "If set, then the Prefix-SID carries a
               value (instead of an index).
               By default the flag is UNSET.";


             }
             bit  local {
               position 2;
               description
               "If set, then the value/index carried by
               the Prefix-SID has local significance.
               By default the flag is UNSET.";
             }
           }
           description



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            "Describes flags associated with the
            segment ID.";
         }

         leaf algorithm {
           type uint8;
           description
            "Algorithm to be used for path computation.";
         }
         leaf value {
           type uint32;
           description
            "Value of the prefix-SID.";
         }
         description
          "List of segments.";
       }
     }

     grouping adjacency-segment-id {
       description
        "This group defines segment routing extensions
        for adjacencies.";

       list sid-list {
         key value;

         leaf flags {
           type bits {
             bit address-family {
               position 7;
               description
                "If unset, then the Adj-SID refers
               to an adjacency with outgoing IPv4 encapsulation.
               If set then the Adj-SID refers to an adjacency
               with outgoing IPv6 encapsulation.";
             }
             bit backup {
               position 6;
               description
                "If set, the Adj-SID refers to an
               adjacency being protected
               (e.g.: using IPFRR or MPLS-FRR)";
             }
             bit  value {
               position 5;
               description
               "If set, then the SID carries a



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               value (instead of an index).
               By default the flag is SET.";


             }
             bit  local {
               position 4;
               description
               "If set, then the value/index carried by
               the SID has local significance.
               By default the flag is SET.";
             }
             bit  set {
               position 3;
               description
               "When set, the S-Flag indicates that the
               Adj-SID refers to a set of adjacencies";
             }
           }

           description
            "Describes flags associated with the
            segment ID.";
         }
         leaf weight {
           type uint8;
           description
            "The value represents the weight of the Adj-SID
             for the purpose of load balancing.";
         }
         leaf neighbor-id {
           type isis:system-id;
           description
            "Describes the system ID of the neighbor
            associated with the SID value. This is only
            used on LAN adjacencies.";
         }
         leaf value {
           type uint32;
           description
            "Value of the Adj-SID.";
         }
         description
          "List of segments.";
       }

     }
     grouping segment-routing-binding-tlv {



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     list segment-routing-bindings {

         key "fec range";

         leaf fec {
           type string;
           description
           "IP (v4 or v6) range to be bound to SIDs.";
         }

         leaf range {
           type uint16;
           description
            "Describes number of elements to assign
            a binding to.";
         }

         leaf flags {
           type bits {
             bit address-family {
               position 7;
               description
               "If unset, then the Prefix FEC
               carries an IPv4 Prefix.
               If set then the Prefix FEC carries an
               IPv6 Prefix.";
             }
             bit mirror {
               position 6;
               description
               "Set if the advertised SID/path
               corresponds to a mirrored context.
               ";
             }
             bit flooding {
               position 5;
               description
                "If the S bit is set(1),
                the IS-IS Router CAPABILITY TLV
               MUST be flooded across the entire routing domain.
               If the S bit is
               not set(0), the TLV MUST NOT be leaked between levels.
               This bit MUST NOT be altered during the TLV leaking.";
             }
             bit down {
               position 4;
               description
               "When the IS-IS Router CAPABILITY TLV is



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               leaked from level-2 to level-1, the D bit
               MUST be set.  Otherwise, this bit MUST
               be clear.  IS-IS Router capability TLVs
               with the D bit set MUST NOT
               be leaked from level-1 to level-2.
               This is to prevent TLV looping.
               ";
             }
             bit attached {
               position 3;
               description
               "The originator of the SID/Label Binding
               TLV MAY set the A bit in order to signal
               that the prefixes and
               SIDs advertised in the SID/Label Binding
               TLV are directly
               connected to their originators.
               ";
             }

           }
           description
              "Flags of the binding.";
         }

         leaf weight {
           type uint8;
           description
            "Weight of the path for loadbalancing purpose.";
         }

         list binding {
           container prefix-sid {
             uses prefix-segment-id;
             description
              "Binding prefix SID to the range.";
           }
           leaf ero-metric {
             type uint32;
             description
              "Cost of ERO path.";
           }
           container ero {
             leaf address-family {
               type identityref {
                 base rt:address-family;
               }
               description



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                "Address-family.";
             }

             leaf loose {
               type boolean;
               description
                "Set to true,
                if hop is a loose hop.";
             }
             leaf address {
               type string;
               description
               "IP address of a node on the
               path.";
             }

             description
              "Binding ERO path to the range.";
           }
           container backup-ero {
             leaf address-family {
               type identityref {
                 base rt:address-family;
               }
               description
                "Address-family.";
             }

             leaf loose {
               type boolean;
               description
                "Set to true,
                if hop is a loose hop.";
             }
             leaf address {
               type string;
               description
               "IP address of a node on the
               path.";
             }

             description
              "Binding backup ERO path to the range.";
           }
           container unnumbered-interface-id-ero {
             leaf router-id {
               type string;
               description



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                "Router ID of the node owning the interface.";
             }
             leaf interface-id {
               type uint32;
               description
               "Interface ID on which the path is built.";
             }
             description
              "Binding a path over unnumbered interface.";
           }
           container backup-unnumbered-interface-id-ero {
             leaf router-id {
               type string;
               description
                "Router ID of the node owning the interface.";
             }
             leaf interface-id {
               type uint32;
               description
               "Interface ID on which the path is built.";
             }
             description
              "Binding a backup path over unnumbered interface.";
           }
           description
            "Bindings associated with the range.";
         }

         description
          "This container describes list of SID/Label
          bindings.
          ISIS reference is TLV 149.";
       }
       description
        "Defines binding TLV for database.";

     }
     /* Cfg */

     augment "/rt:routing/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis" {
       when "rt:type = 'isis:isis'" {
         description
         "This augment ISIS routing protocol when used";
       }
       description
        "This augments ISIS protocol configuration



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         with segment routing.";

       uses sr:controlplane-cfg;
     }


      augment "/rt:routing/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:interfaces/isis:interface" {
       when "rt:type = 'isis:isis'" {
         description
         "This augment ISIS routing protocol when used";
       }
       description
        "This augments ISIS protocol configuration
         with segment routing.";

       uses sr:igp-interface-cfg;
     }



     /* Operational states */

     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis" {
       when "rt:type = 'isis:isis'" {
         description
         "This augment ISIS routing protocol when used";
       }
       description
        "This augments ISIS protocol configuration
         with segment routing.";

       uses sr:controlplane-cfg;
     }

      augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:interfaces/isis:interface" {
       when "rt:type = 'isis:isis'" {
         description
         "This augment ISIS routing protocol when used";
       }
       description
        "This augments ISIS protocol configuration
         with segment routing.";



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       uses sr:igp-interface-cfg;
     }

     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:interfaces/isis:interface" +
           "/isis:adjacencies/isis:adjacency" {
       when "rt:type = 'isis:isis'" {
         description
         "This augment ISIS routing protocol when used";
       }
       description
        "This augments ISIS protocol configuration
         with segment routing.";


       uses adjacency-state;
     }

     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:database/isis:level-db/isis:lsp"+
           "/isis:extended-is-neighbor/isis:neighbor" {
       description
        "This augments ISIS protocol LSDB neighbor.";
       uses adjacency-segment-id;

     }
     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:database/isis:level-db/isis:lsp"+
           "/isis:mt-is-neighbor/isis:neighbor" {
           description
        "This augments ISIS protocol LSDB neighbor.";
       uses adjacency-segment-id;

     }
     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:database/isis:level-db/isis:lsp"+
           "/isis:extended-ipv4-reachability/isis:prefixes" {
           description
        "This augments ISIS protocol LSDB prefix.";
       uses prefix-segment-id;

     }
     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+



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           "/isis:isis/isis:database/isis:level-db/isis:lsp"+
           "/isis:mt-extended-ipv4-reachability/isis:prefixes" {
           description
        "This augments ISIS protocol LSDB prefix.";
       uses prefix-segment-id;

     }
     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:database/isis:level-db/isis:lsp"+
           "/isis:ipv6-reachability/isis:prefixes" {
           description
        "This augments ISIS protocol LSDB prefix.";
       uses prefix-segment-id;

     }
     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:database/isis:level-db/isis:lsp"+
           "/isis:mt-ipv6-reachability/isis:prefixes" {
           description
        "This augments ISIS protocol LSDB prefix.";
       uses prefix-segment-id;

     }
     augment "/rt:routing-state/rt:routing-instance/" +
           "rt:routing-protocols/rt:routing-protocol"+
           "/isis:isis/isis:database/isis:level-db/isis:lsp" {
           description
        "This augments ISIS protocol LSDB.";
       uses segment-routing-binding-tlv;

     }


     /* Notifications */


   }

   <CODE ENDS>

9.  Security Considerations

   Configuration and state data defined in this document are designed to
   be accessed via the NETCONF protocol [RFC6241].





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   As ISIS is an IGP protocol (critical piece of the network), ensuring
   stability and security of the protocol is mandatory for the network
   service.

   Authors recommends to implement NETCONF access control model
   ([RFC6536]) to restrict access to all or part of the configuration to
   specific users.  Access control to RPCs is also critical as RPC
   permits to clear protocol datastructures that would definitively
   impact the network service.  This kind of RPC needs only to be used
   in specific cases by well-known experienced users.

   Authors consider that all the configuration is considered as
   sensitive/vulnerable as well as RPCs.  But security teams can decide
   to open some part of the configuration to less experienced users
   depending on the internal organization, for example:

   o  User FullWrite: would access to the whole data model.  This kind
      of profile may be restricted to few experienced people.

   o  User PartialWrite: would only access to configuration part within
      /isis/interfaces/interface.  So this kind of profile is restricted
      to creation/modification/deletion of interfaces.  This profile
      does not have access to RPC.

   o  User Read: would only access to state part /isis-state.

   Unauthorized access to configuration or RPC may cause high damages to
   the network service.

   The /isis-state/database may contain authentication information.  As
   presented in the description of the /isis-state/database/level-
   1/lsp/authentication/authentication-key, the authentication MUST
   never be presented in plaintext format for security reason.  Authors
   recommends the usage of MD5 to present the authentication-key.

   Some authentication-key may also be present in the /isis
   configuration.  When configuring ISIS using the NETCONF protocol,
   authors recommends the usage of secure transport of NETCONF using SSH
   ([RFC6242]).

10.  Contributors

   Authors would like to thank Kiran Agrahara Sreenivasa, Dean
   Bogdanovic, Yingzhen Qu, Yi Yang for their major contributions to the
   draft.






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11.  Acknowledgements

   TBD.

12.  IANA Considerations

   TBD.

13.  Normative References

   [I-D.ietf-netmod-routing-cfg]
              Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
              Management", draft-ietf-netmod-routing-cfg-19 (work in
              progress), May 2015.

   [I-D.litkowski-spring-sr-yang]
              Litkowski, S., Lindem, A., Sarkar, P., and H. Chen, "YANG
              Data Model for Segment Routing", draft-litkowski-spring-
              sr-yang-00 (work in progress), March 2015.

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

   [RFC6241]  Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
              Bierman, "Network Configuration Protocol (NETCONF)", RFC
              6241, June 2011.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, June 2011.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536, March
              2012.

Appendix A.  Example: NETCONF <get> Reply

   This section gives an example of a reply to the NETCONF <get> request
   for a device that implements the data model defined in this document.
   The example is written in XML.

   <?xml version="1.0" encoding="utf-8"?>
   <data xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
     <routing xmlns="urn:ietf:params:xml:ns:yang:ietf-routing">
       <routing-instance>
         <name>SLI</name>
         <router-id>1.1.1.1</router-id>
         <description/>
         <default-ribs>



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           <default-rib>
             <address-family>ipv4-unicast</address-family>
             <rib-name>default</rib-name>
           </default-rib>
         </default-ribs>
         <interfaces>
           <interface>
             <name>Loopback0</name>
           </interface>
           <interface>
             <name>Eth1</name>
           </interface>
         </interfaces>
         <routing-protocols>
           <routing-protocol>
             <name>ISIS</name>
             <description/>
             <type>isis:isis</type>
             <connected-ribs>
               <connected-rib>
                 <rib-name>default</rib-name>
                 <import-filter/>
                 <export-filter/>
               </connected-rib>
             </connected-ribs>
             <isis xmlns="urn:ietf:params:xml:ns:yang:ietf-isis">
               <instance>
                 <routing-instance>SLI</routing-instance>
                 <level-type>level-2</level-type>
                 <system-id>87FC.FCDF.4432</system-id>
                 <area-address>49.0001</area-address>
                 <mpls-te>
                   <ipv4-router-id>1.1.1.1</ipv4-router-id>
                 </mpls-te>
                 <lsp-lifetime>65535</lsp-lifetime>
                 <lsp-refresh>65000</lsp-refresh>
                 <authentication>
                   <key>ThisIsThePassword</key>
                   <type>plain-text</type>
                   <level>level-2</level>
                 </authentication>
                 <metric-type>
                   <value>wide</value>
                 </metric-type>
                 <default-metric>
                   <value>111111</value>
                 </default-metric>
                 <af>



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                   <af>ipv4-unicast</af>
                   <enabled>true</enabled>
                 </af>
                 <interfaces>
                   <interface>
                     <name>Loopback0</name>
                     <tag>200</tag>
                     <metric>
                       <value>0</value>
                     </metric>
                     <passive>true</passive>
                   </interface>
                   <interface>
                     <name>Eth1</name>
                     <level-type>level-2</level-type>
                     <interface-type>point-to-point</interface-type>
                     <metric>
                       <value>167890</value>
                     </metric>

                   </interface>
                 </interfaces>
               </instance>
             </isis>
           </routing-protocol>
         </routing-protocols>
       </routing-instance>
       <ribs>
         <rib>
           <name>default</name>
           <address-family>ipv4-unicast</address-family>
           <description/>
           <recipient-ribs>
             <recipient-rib>
               <rib-name/>
               <filter/>
             </recipient-rib>
           </recipient-ribs>
         </rib>
       </ribs>
       <route-filters>
         <route-filter>
           <name/>
           <description/>
           <type/>
         </route-filter>
       </route-filters>
     </routing>



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     <interfaces xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces">
       <interface>
         <name>Loopback0</name>
         <description/>
         <type/>
         <link-up-down-trap-enable/>
         <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
           <mtu/>
           <address>
             <ip>1.1.1.1</ip>
             <prefix-length>32</prefix-length>
           </address>
         </ipv4>

       </interface>
       <interface>
         <name>Eth1</name>
         <description/>
         <type/>
         <link-up-down-trap-enable/>
         <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
           <mtu/>
           <address>
             <ip>10.0.0.1</ip>
             <prefix-length>30</prefix-length>
           </address>
         </ipv4>

       </interface>
     </interfaces>
   </data>

Authors' Addresses

   Stephane Litkowski
   Orange

   Email: stephane.litkowski@orange.com


   Derek Yeung
   Cisco Systems

   Email: myeung@cisco.com







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   Acee Lindem
   Cisco Systems

   Email: acee@cisco.com


   Jeffrey Zhang
   Juniper Networks

   Email: zzhang@juniper.net


   Ladislav Lhotka

   Email: lhotka@nic.cz




































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