A YANG Data Model for MPLS Static LSPs
draft-ietf-mpls-static-yang-01

MPLS Working Group                                               T. Saad
Internet-Draft                                                   K. Raza
Intended status: Standards Track                               R. Gandhi
Expires: January 6, 2017                               Cisco Systems Inc
                                                                  X. Liu
                                                                Ericsson
                                                               V. Beeram
                                                        Juniper Networks
                                                                 H. Shah
                                                                   Ciena
                                                              I. Bryskin
                                                                 X. Chen
                                                     Huawei Technologies
                                                                R. Jones
                                                                 Brocade
                                                                  B. Wen
                                                                 Comcast
                                                           July 05, 2016

                 A YANG Data Model for MPLS Static LSPs
                     draft-ietf-mpls-static-yang-01

Abstract

   This document contains the specification for the MPLS Static Label
   Switched Paths (LSPs) YANG model.  The model allows for the
   provisioning of static LSP(s) on LER(s) and LSR(s) devices along a
   LSP path without the dependency on any signaling protocol.  The MPLS
   Static LSP model augments the MPLS base YANG model with specific data
   to configure and manage MPLS Static LSP(s).

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 January 6, 2017.

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Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   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.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Model Organization  . . . . . . . . . . . . . . . . . . .   4
     1.3.  MPLS Static LSPs Model Tree Diagram . . . . . . . . . . .   4
     1.4.  MPLS Static LSP YANG Module(s)  . . . . . . . . . . . . .   6
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     4.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     4.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   This document describes a YANG data model for configuring and
   managing the Static LSPs feature.  The model allows the configuration
   of LER and LSR devices with the necessary MPLS cross-connects or
   bindings to realize an end-to-end LSP service.

   A static LSP is established by manually specifying incoming and
   outgoing MPLS label(s) and necessary forwarding information on each
   of the traversed Label Edge Router (LER) and Label Switched Router
   (LSR) devices (ingress, transit, or egress nodes) of the forwarding
   path.

   For example, on an ingress LER device, the model is used to associate
   a specific Forwarding Equivalence Class (FEC) of packets- e.g.
   matching a specific IP prefix in a Virtual Routing or Forwarding
   (VRF) instance- to an MPLS outgoing label imposition, next-hop(s) and
   respective outgoing interface(s) to forward the packet.  On an LSR
   device, the model is used to create a binding that swaps the incoming

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   label with an outgoing label and forwards the packet on one or
   multiple egress path(s).  On an egress LER, it is used to create a
   binding that decapsulates the incoming MPLS label and performs
   forwarding based on the inner MPLS label (if present) or IP
   forwarding in the packet.

   The MPLS Static LSP YANG model is defined in module "ietf-mpls-
   static" and augments the MPLS Base YANG model defined in module
   "ietf-mpls" in [I-D.saad-mpls-static-yang].  The approach described
   in [I-D.openconfig-netmod-opstate] is adopted to represent data
   pertaining to configuration intended, applied state and derived state
   data elements.  Each container in the model holds a "config" and
   "state" sub-container.  The "config" sub-container is used to
   represent the intended configurable parameters, and the state sub-
   container is used to represent both the applied configurable
   parameters and any derived state, such as counters or statistical
   information.

1.1.  Terminology

   In this document, the key words "MUST", "MUST NOT", "REQUIRED",
   "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY",
   and "OPTIONAL" are to be interpreted as described in BCP 14, RFC 2119
   [RFC2119].

   The following terms are defined in [RFC6020]:

   o augment,

   o configuration data,

   o data model,

   o data node,

   o feature,

   o mandatory node,

   o module,

   o schema tree,

   o state data,

   o RPC operation.

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1.2.  Model Organization

   The base MPLS Static LSP model covers the core features with the
   minimal set of configuration parameters needed to manage and operate
   MPLS Static LSPs.

   Additional MPLS Static LSP parameters as well as optional feature(s)
   are grouped in a separate MPLS Static LSP extended model.  The
   relationship between the MPLS base and other MPLS modules are shown
   in Figure 1.

     MPLS base        +-----------+    ^: import
     module           | ietf-mpls |    o: augment
                      +-----------+
                         o          o
                         |           \
                         v            V
                 +------------------+ +--------------------+
     MPLS Static | ietf-mpls-static | | ietf-mpls-ldp.yang | . . .
     LSP module  +------------------+ +--------------------+
                             ^
                             |
                             o
                    +---------------------------+
    Extended MPLS   | ietf-mpls-static-extended |
    Static LSP      +---------------------------+
    module

                Figure 1: Relationship between MPLS modules

1.3.  MPLS Static LSPs Model Tree Diagram

   The MPLS Static LSP tree diagram is shown in Figure 2.

   module: ietf-mpls-static
   augment /rt:routing/mpls:mpls:
      +--rw static-lsps
         +--rw static-lsp* [name]
         |  +--rw name      string
         |  +--rw config
         |  |  +--rw in-segment
         |  |  |  +--rw (type)?
         |  |  |  |  +--:(ip-prefix)
         |  |  |  |  |  +--rw ip-prefix?            inet:ip-prefix
         |  |  |  |  +--:(mpls-label)
         |  |  |  |  |  +--rw incoming-label?       mpls:mpls-label
         |  |  |  |  +--:(tunnel)

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         |  |  |  |     +--rw tunnel?               te:tunnel-ref
         |  |  |  +--rw incoming-interface?   if:interface-ref
         |  |  +--rw operation?            enumeration
         |  |  +--rw (out-segment)?
         |  |     +--:(simple-path)
         |  |     |  +--rw next-hop?             inet:ip-address
         |  |     |  +--rw outgoing-label?       mpls:mpls-label
         |  |     |  +--rw outgoing-interface?   if:interface-ref
         |  |     +--:(path-list)
         |  |        +--rw paths* [path-index]
         |  |           +--rw path-index            uint16
         |  |           +--rw backup-path-index?    uint16
         |  |           +--rw next-hop?             inet:ip-address
         |  |           +--rw outgoing-labels*      mpls:mpls-label
         |  |           +--rw outgoing-interface?   if:interface-ref
         |  |           +--rw loadshare?            uint16
         |  |           +--rw role?                 enumeration
         |  +--ro state
         |     +--ro in-segment
         |     |  +--ro (type)?
         |     |  |  +--:(ip-prefix)
         |     |  |  |  +--ro ip-prefix?            inet:ip-prefix
         |     |  |  +--:(mpls-label)
         |     |  |  |  +--ro incoming-label?       mpls:mpls-label
         |     |  |  +--:(tunnel)
         |     |  |     +--ro tunnel?               te:tunnel-ref
         |     |  +--ro incoming-interface?   if:interface-ref
         |     +--ro operation?            enumeration
         |     +--ro (out-segment)?
         |        +--:(simple-path)
         |        |  +--ro next-hop?             inet:ip-address
         |        |  +--ro outgoing-label?       mpls:mpls-label
         |        |  +--ro outgoing-interface?   if:interface-ref
         |        +--:(path-list)
         |           +--ro paths* [path-index]
         |              +--ro path-index            uint16
         |              +--ro backup-path-index?    uint16
         |              +--ro next-hop?             inet:ip-address
         |              +--ro outgoing-labels*      mpls:mpls-label
         |              +--ro outgoing-interface?   if:interface-ref
         |              +--ro loadshare?            uint16
         |              +--ro role?                 enumeration
         +--rw mpls-static-ext:bandwidth?            uint32
         +--rw mpls-static-ext:lsp-priority-setup?   uint8
         +--rw mpls-static-ext:lsp-priority-hold?    uint8

                  Figure 2: MPLS Static LSP tree diagram

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1.4.  MPLS Static LSP YANG Module(s)

   The MPLS Static LSP module is shown in Figure 3.

 <CODE BEGINS>file "ietf-mpls-static@2016-07-05.yang"
 module ietf-mpls-static {

   namespace "urn:ietf:params:xml:ns:yang:ietf-mpls-static";

   prefix "mpls-static";

   import ietf-mpls {
     prefix mpls;
   }

   import ietf-routing {
     prefix "rt";
   }

   import ietf-inet-types {
     prefix inet;
   }

   import ietf-interfaces {
     prefix "if";
   }

   /* Import TE generic types */
   import ietf-te {
     prefix te;
   }

   organization "IETF MPLS Working Group";

   contact
     "WG Web:   <http://tools.ietf.org/wg/mpls/>

      WG List:  <mailto:mpls@ietf.org>

      WG Chair: Loa Andersson
                <mailto:loa@pi.nu>

      WG Chair: Ross Callon
                <mailto:rcallon@juniper.net>

      WG Chair: George Swallow
                <mailto:swallow.ietf@gmail.com>

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      Editor:   Tarek Saad
                <mailto:tsaad@cisco.com>

      Editor:   Kamran Raza
                <mailto:skraza@cisco.com>

      Editor:   Rakesh Gandhi
                <mailto:rgandhi@cisco.com>

      Editor:   Xufeng Liu
                <mailto: xufeng.liu.ietf@gmail.com>

      Editor:   Vishnu Pavan Beeram
                <mailto:vbeeram@juniper.net>

      Editor:   Himanshu Shah
                <mailto:hshah@ciena.com>

      Editor:   Igor Bryskin
                <mailto: Igor.Bryskin@huawei.com>

      Editor:   Xia Chen
                <mailto:jescia.chenxia@huawei.com>

      Editor:   Raqib Jones
                <mailto:raqib@Brocade.com>

      Editor:   Bin Wen
                <mailto:Bin_Wen@cable.comcast.com>";

   description
      "This YANG module augments the 'ietf-routing' module with basic
      configuration and operational state data for MPLS static";

   revision "2016-07-05" {
     description
       "Latest revision:
         - Addressed MPLS-RT review comments";
     reference "RFC 3031: A YANG Data Model for Static MPLS LSPs";
   }

   typedef static-lsp-ref {
     type leafref {
       path "/rt:routing/mpls:mpls/mpls-static:static-lsps/" +
            "mpls-static:static-lsp/mpls-static:name";
     }
     description
       "This type is used by data models that need to reference

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        configured static LSP.";
   }

   grouping path-basic_config {
     description "common definitions for statics";

     leaf next-hop {
       type inet:ip-address;
       description "next hop IP address for the LSP";
     }

     leaf outgoing-label {
       type mpls:mpls-label;
       description
         "label value to push at the current hop for the
          LSP";
     }

     leaf outgoing-interface {
       type if:interface-ref;
       description
         "The outgoing interface";
     }
   }

   grouping path-properties_config {
     description
       "MPLS path properties";
     leaf path-index {
       type uint16;
       description
         "Path identifier";
     }

     leaf backup-path-index {
       type uint16;
       description
         "Backup path identifier";
     }

     leaf next-hop {
       type inet:ip-address;
       description
         "The address of the next-hop";
     }

     leaf-list outgoing-labels {
       type mpls:mpls-label;

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       ordered-by user;
       description
         "The outgoing MPLS labels to impose";
     }

     leaf outgoing-interface {
       type if:interface-ref;
       description
         "The outgoing interface";
     }

     leaf loadshare {
       type uint16;
       description
         "This value is used to compute a loadshare to perform un-equal
          load balancing when multiple outgoing path(s) are specified. A
          share is computed as a ratio of this number to the total under
          all configured path(s).";
     }

     leaf role {
       type enumeration {
         enum PRIMARY {
           description
             "Path as primary traffic carrying";
         }
         enum BACKUP {
           description
             "Path acts as backup";
         }
         enum PRIMARY_AND_BACKUP {
           description
             "Path acts as primary and backup simultaneously";
         }
       }
       description
         "The MPLS path role";
     }
   }

   grouping static-lsp_config {
     description "common definitions for static LSPs";

     container in-segment {
       description
         "MPLS incoming segment";
       choice type {
         description

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           "Basic FEC choice";
         case ip-prefix {
           leaf ip-prefix {
             type inet:ip-prefix;
             description "An IP prefix";
           }
         }
         case mpls-label {
           leaf incoming-label {
             type mpls:mpls-label;
             description "label value on the incoming packet";
           }
         }
         case tunnel {
           leaf tunnel {
             type te:tunnel-ref;
             description "TE tunnel FEC mapping";
           }
         }
       }
       leaf incoming-interface {
         type if:interface-ref;
         description
           "Optional incoming interface if FEC is restricted
            to traffic incoming on a specific interface";
       }
     }

     leaf operation {
       type enumeration {
         enum impose-and-forward {
           description
             "Operation impose outgoing label(s) and forward to
              next-hop";
         }
         enum pop-and-forward {
           description
             "Operation pop incoming label and forward to next-hop";
         }
         enum pop-impose-and-forward {
           description
             "Operation pop incoming label, impose one or more
              outgoing label(s) and forward to next-hop";
         }
         enum swap-and-forward {
           description
             "Operation swap incoming label, with outgoing label and
              forward to next-hop";

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         }
         enum pop-and-lookup {
           description
             "Operation pop incoming label and perform a lookup";
         }
       }
       description
         "The MPLS operation to be executed on the incoming packet";
     }

     choice out-segment {
       description "The MPLS out-segment type choice";
       case simple-path {
         uses path-basic_config;
       }
       case path-list {
         list paths {
           key path-index;
           description
             "The list of MPLS paths associated with the FEC";
           uses path-properties_config;
         }
       }
     }
   }

   grouping static-lsp {
     description "grouping for top level list of static LSPs";
     container config {
       description
         "Holds the intended configuration";
       uses static-lsp_config;
     }
     container state {
       config false;
       description
         "Holds the state and inuse configuration";
       uses static-lsp_config;
     }
   }

   augment "/rt:routing/mpls:mpls" {
     description "Augmentations for MPLS Static LSPs";
     container static-lsps {
       description
         "Statically configured LSPs, without dynamic signaling";
       list static-lsp {
         key name;

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         description "list of defined static LSPs";

         leaf name {
           type string;
           description "name to identify the LSP";
         }
         uses static-lsp;
       }
     }
   }
 }
 <CODE ENDS>

                   Figure 3: MPLS Static LSP YANG module

   The extended MPLS Static LSP module is shown in Figure 4.

   <CODE BEGINS>file "ietf-mpls-static-extended@2016-07-05.yang"
   module ietf-mpls-static-extended {

     namespace "urn:ietf:params:xml:ns:yang:ietf-mpls-static-extended";

     prefix "mpls-static-ext";

     import ietf-mpls {
       prefix "mpls";
     }

     import ietf-routing {
       prefix "rt";
     }

     import ietf-mpls-static {
       prefix "mpls-static";
     }

     organization "IETF MPLS Working Group";

     contact
       "WG Web:   <http://tools.ietf.org/wg/mpls/>

        WG List:  <mailto:mpls@ietf.org>

        WG Chair: Loa Andersson
                  <mailto:loa@pi.nu>

        WG Chair: Ross Callon
                  <mailto:rcallon@juniper.net>

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        WG Chair: George Swallow
                  <mailto:swallow.ietf@gmail.com>

        Editor:   Tarek Saad
                  <mailto:tsaad@cisco.com>

        Editor:   Kamran Raza
                  <mailto:skraza@cisco.com>

        Editor:   Rakesh Gandhi
                  <mailto:rgandhi@cisco.com>

        Editor:   Xufeng Liu
                  <mailto: xufeng.liu.ietf@gmail.com>

        Editor:   Vishnu Pavan Beeram
                  <mailto:vbeeram@juniper.net>

        Editor:   Himanshu Shah
                  <mailto:hshah@ciena.com>

        Editor:   Igor Bryskin
                  <mailto: Igor.Bryskin@huawei.com>

        Editor:   Xia Chen
                  <mailto:jescia.chenxia@huawei.com>

        Editor:   Raqib Jones
                  <mailto:raqib@Brocade.com>

        Editor:   Bin Wen
                  <mailto:Bin_Wen@cable.comcast.com>";

     description
       "This module contains the Extended RSVP YANG data model.";

     revision 2016-07-05 {
       description "Latest revision of RSVP extended yang module.";
       reference "RFC2205";
     }

     /* RSVP features */
     feature bandwidth {
       description
         "Indicates support for static LSP bandwidth allocation";
     }

     grouping static-lsp-extended_config {

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       description
         "Configuration parameters for MPLS extended
          parameters";
       leaf bandwidth {
         type uint32;
         description
           "bandwidth in Mbps, e.g., using offline calculation";
       }
       leaf lsp-priority-setup {
         type uint8 {
           range "0..7";
         }
         description "LSP setup priority";
       }
       leaf lsp-priority-hold {
         type uint8 {
           range "0..7";
         }
         description "LSP hold priority";
       }
     }

     grouping bidir-static-lsp_config {
       description "common definitions for static LSPs";
       leaf forward-lsp {
         type mpls-static:static-lsp-ref;
         description
           "Reference to a configured static forward LSP";
                   }
       leaf reverse-lsp {
         type mpls-static:static-lsp-ref;
         description
           "Reference to a configured static reverse LSP";
                   }
     }

     grouping bidir-static-lsp {
       description "grouping for top level list of static LSPs";
       container config {
         description
           "Holds the intended configuration";
         uses bidir-static-lsp_config;
       }
       container state {
         config false;
         description
           "Holds the state and inuse configuration";
         uses bidir-static-lsp_config;

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       }
     }

     augment "/rt:routing/mpls:mpls/mpls-static:static-lsps" {
       description
         "RSVP signaling all interfaces configuration extensions";
       uses static-lsp-extended_config;
     }

     augment "/rt:routing/mpls:mpls" {
       description "Augmentations for MPLS Static LSPs";
       container bidir-static-lsps {
         description
           "Statically configured LSPs, without dynamic signaling";
         list bidir-static-lsp {
           key name;
           description "list of defined static LSPs";

           leaf name {
             type string;
             description "name to identify the LSP";
           }
           uses bidir-static-lsp;
         }
       }
     }
   }
   <CODE ENDS>

              Figure 4: Extended MPLS Static LSP YANG module

2.  IANA Considerations

   This document registers the following URIs in the IETF XML registry
   [RFC3688].  Following the format in [RFC3688], the following
   registration is requested to be made.

   URI: urn:ietf:params:xml:ns:yang:ietf-mpls-static XML: N/A, the
   requested URI is an XML namespace.

   URI: urn:ietf:params:xml:ns:yang:ietf-mpls-static-extended XML: N/A,
   the requested URI is an XML namespace.

   This document registers two YANG modules in the YANG Module Names
   registry [RFC6020].

   name: ietf-mpls-static namespace: urn:ietf:params:xml:ns:yang:ietf-
   mpls-static prefix: ietf-mpls-static reference: RFC3031

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   name: ietf-mpls-static-exteneded namespace:
   urn:ietf:params:xml:ns:yang:ietf-mpls-static-extended prefix: ietf-
   mpls-static reference: RFC3031

3.  Security Considerations

   The YANG module defined in this memo is designed to be accessed via
   the NETCONF protocol [RFC6241].  The lowest NETCONF layer is the
   secure transport layer and the mandatory-to-implement secure
   transport is SSH [RFC6242].  The NETCONF access control model
   [RFC6536] provides means to restrict access for particular NETCONF
   users to a pre-configured subset of all available NETCONF protocol
   operations and content.

   There are a number of data nodes defined in the YANG module which are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., <edit-config>)
   to these data nodes without proper protection can have a negative
   effect on network operations.

4.  References

4.1.  Normative References

   [I-D.saad-mpls-static-yang]
              Saad, T., Raza, K., Gandhi, R., Liu, X., Beeram, V., Shah,
              H., Bryskin, I., Chen, X., Jones, R., and B. Wen, "A YANG
              Data Model for MPLS Static LSPs", draft-saad-mpls-static-
              yang-03 (work in progress), May 2016.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/
              RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <http://www.rfc-editor.org/info/rfc3688>.

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

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   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <http://www.rfc-editor.org/info/rfc6241>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <http://www.rfc-editor.org/info/rfc6242>.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536, DOI
              10.17487/RFC6536, March 2012,
              <http://www.rfc-editor.org/info/rfc6536>.

4.2.  Informative References

   [I-D.openconfig-netmod-opstate]
              Shakir, R., Shaikh, A., and M. Hines, "Consistent Modeling
              of Operational State Data in YANG", draft-openconfig-
              netmod-opstate-01 (work in progress), July 2015.

Authors' Addresses

   Tarek Saad
   Cisco Systems Inc

   Email: tsaad@cisco.com

   Kamran Raza
   Cisco Systems Inc

   Email: skraza@cisco.com

   Rakesh Gandhi
   Cisco Systems Inc

   Email: rgandhi@cisco.com

   Xufeng Liu
   Ericsson

   Email: xufeng.liu.ietf@gmail.com

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   Vishnu Pavan Beeram
   Juniper Networks

   Email: vbeeram@juniper.net

   Himanshu Shah
   Ciena

   Email: hshah@ciena.com

   Igor Bryskin
   Huawei Technologies

   Email: Igor.Bryskin@huawei.com

   Xia Chen
   Huawei Technologies

   Email: jescia.chenxia@huawei.com

   Raqib Jones
   Brocade

   Email: raqib@Brocade.com

   Bin Wen
   Comcast

   Email: Bin_Wen@cable.comcast.com

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