Internet-Draft Traffic-TE-YANG October 2024
Dhody Expires 23 April 2025 [Page]
Workgroup:
TEAS Working Group
Internet-Draft:
draft-dhody-teas-te-traffic-yang-05
Published:
Intended Status:
Standards Track
Expires:
Author:
D. Dhody
Huawei

Traffic Mapping YANG model for Traffic Engineering (TE)

Abstract

This document provides a YANG data model to map traffic to Traffic Engineering (TE) paths. This model provides the operator a seamless control and management of which traffic to send on the underlying TE resources.

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 https://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 23 April 2025.

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Table of Contents

1. Introduction

Data models are a representation of objects that can be configured or monitored within a system. Within the IETF, YANG [RFC7950] is the language of choice for documenting data models, and YANG models have been produced to allow the configuration or modelling of a variety of network devices, protocol instances, and network services.

There are various YANG models to establish paths in the network, such as:

These models do not include an exact mechanism to describe the traffic that needs to be mapped to the paths. Thus an operator lacks a way to simply use the YANG model to tell requirements such as the traffic from source X on port Y should go on a TE path with delay less than Z. The YANG model defined in this document fills this gap.

To achieve this goal, the YANG model defined in this document utilizes the concept borrowed from:

The YANG model includes two key concepts:

Note: The RFC Editor will replace XXXX with the number assigned to the RFC once this draft becomes an RFC.

1.1. Tree Diagrams

A simplified graphical representation of the data model is used in this document. The meaning of the symbols in these diagrams is defined in [RFC8340].

1.2. Prefixes in Data Node Names

In this document, names of data nodes and other data model objects are often used without a prefix, as long as it is clear from the context in which the YANG module each name is defined. Otherwise, names are prefixed using the standard prefix associated with the corresponding YANG module, as shown in Table 1.

Table 1
Prefix YANG module Reference
inet ietf-inet-types [RFC6991]
yang ietf-yang-types [RFC6991]
te ietf-te [I-D.ietf-teas-yang-te]
rt ietf-routing [RFC8349]
sr-policy ietf-sr-policy [I-D.ietf-spring-sr-policy-yang]
ietf-nss ietf-network-slice-service [I-D.ietf-teas-ietf-network-slice-nbi-yang]
acl ietf-access-control-list [RFC8519]
packet-fields ietf-packet-fields [RFC8519]
vpn-common ietf-vpn-common [RFC9181]

1.3. References in the Model

The following documents are referenced in the model defined in this document -

Table 2
Document Reference
YANG Data Model for Network Access Control Lists (ACLs) [RFC8519]
A YANG Data Model for Traffic Engineering Tunnels and Interfaces [I-D.ietf-teas-yang-te]
YANG Data Model for Segment Routing Policy [I-D.ietf-spring-sr-policy-yang]

2. Discussion Items

For describing the traffic, currently, the YANG models use:

3. Tree Structure 

module: ietf-traffic-map
  +--rw traffic-map
     +--rw maps* [id]
        +--rw id         string
        +--rw traffic
        |  +--rw id?                      string
        |  +--rw (type)?
        |     +--:(match-criteria)
        |     |  +--rw match-criterion* [index]
        |     |     +--rw index         uint32
        |     |     +--rw match-type    identityref
        |     |     +--rw value*        string
        |     +--:(acl)
        |     |  +--rw acl?               -> /acl:acls/acl/name
        |     +--:(flowspec)
        |     +--:(interface)
        |     |  +--rw node?              string
        |     |  +--rw if-name?           string
        |     +--:(flow)
        |     |  +--rw (l3)?
        |     |  |  +--:(ipv4)
        |     |  |  |  +--rw ipv4
        |     |  |  |        ...
        |     |  |  +--:(ipv6)
        |     |  |     +--rw ipv6
        |     |  |           ...
        |     |  +--rw (l4)?
        |     |     +--:(tcp)
        |     |     |  +--rw tcp
        |     |     |        ...
        |     |     +--:(udp)
        |     |        +--rw udp
        |     |              ...
        |     +--:(other)
        +--rw action
        |  +--rw te-tunnel*   te:tunnel-ref
        |  +--rw sr-policy* [headend policy-color-ref policy-endpoint-ref]
        |  |  +--rw headend                inet:ip-address-no-zone
        |  |  +--rw policy-color-ref       leafref
        |  |  +--rw policy-endpoint-ref    leafref
        |  +--rw other
        +--ro stats
           +--ro matched-packets?   yang:counter64
           +--ro matched-octets?    yang:counter64

4. YANG Model 

<CODE BEGINS> file "[email protected]"
module ietf-traffic-map {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-traffic-map";
  prefix tm;

  import ietf-inet-types {
    prefix inet;
    reference
      "RFC 6991: Common YANG Data Types";
  }
  import ietf-yang-types {
    prefix yang;
    reference
      "RFC 6991: Common YANG Data Types";
  }
  import ietf-te {
    prefix te;
    reference
      "I-D.ietf-teas-yang-te: A YANG Data Model for Traffic
       Engineering Tunnels and Interfaces";
  }
  import ietf-routing {
    prefix rt;
    reference
      "RFC8349: A YANG Data Model for Routing Management";
  }
  import ietf-sr-policy {
    prefix sr-policy;
    reference
      "I-D.ietf-spring-sr-policy-yang: YANG Data Model for Segment
       Routing Policy";
  }
  import ietf-network-slice-service {
    prefix ietf-nss;
    reference
      "I-D.ietf-teas-ietf-network-slice-nbi-yang: IETF
       Network Slice Service YANG Model";
  }
  import ietf-packet-fields {
    prefix packet-fields;
    reference
      "RFC 8519: YANG Data Model for Network Access
       Control Lists (ACLs)";
  }
  import ietf-access-control-list {
    prefix acl;
    reference
      "RFC 8519: YANG Data Model for Network Access Control
       Lists (ACLs)";
  }
  import ietf-vpn-common {
    prefix vpn-common;
    reference
      "RFC 9181: A Common YANG Data Model for Layer 2 and
       Layer 3 VPNs";
  }

  organization
    "IETF Traffic Engineering Architecture and Signaling (TEAS)
     Working Group";
  contact
    "WG Web:  <https://datatracker.ietf.org/wg/teas/about/>
     WG List:  <mailto:[email protected]>
     Editor: Dhruv Dhody <[email protected]>";
  description
    "This module contains a YANG module to map traffic to
     Traffic Engineering (TE) paths.

     Copyright (c) 2024 IETF Trust and the persons identified as
     authors of the code.  All rights reserved.

     Redistribution and use in source and binary forms, with or
     without modification, is permitted pursuant to, and subject to
     the license terms contained in, the Revised BSD License set
     forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (https://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC XXXX; see the
     RFC itself for full legal notices.";

  revision 2024-10-20 {
    description
      "Initial version.";
    reference
      "RFC XXXX: Traffic Mapping YANG model for Traffic
       Engineering (TE)";
  }

  grouping traffic-description {
    description
      "The traffic description";
    leaf id {
      type string;
      description
        "The identifier for Traffic Description";
    }
    choice type {
      description
        "The various ways the traffic can be described";
      case match-criteria {
        description
          "Use the match criteria";
        list match-criterion {
          key "index";
          description
            "List of traffic match criteria.";
          leaf index {
            type uint32;
            description
              "The entry index.";
          }
          leaf match-type {
            type identityref {
              base ietf-nss:service-match-type;
            }
            mandatory true;
            description
              "Identifies an entry in the list of the
               match criteria.";
          }
          leaf-list value {
            type string;
            description
              "Describes the slice service match criteria, e.g.
               IP address, VLAN, etc.";
          }
        }
      }
      case acl {
        description
          "Reference to ACL";
        leaf acl {
          type leafref {
            path "/acl:acls/acl:acl/acl:name";
          }
          description
            "The ACL Name. The action part of the ACL is not
             used.";
          reference
            "RFC8519: YANG Data Model for Network Access Control
             Lists (ACLs)";
        }
      }
      case flowspec {
        description
          "Based on FlowSpec component type - TODO";
      }
      case interface {
        description
          "All traffic received on an interface";
        leaf node {
          type string;
          description
            "The node identifier";
        }
        leaf if-name {
          type string;
          description
            "The interface name on the node";
        }
      }
      case flow {
        description
          "Match particular flows";
        choice l3 {
          description
            "Either IPv4 or IPv6.";
          container ipv4 {
            description
              "Rule set that matches the IPv4 header.";
            uses packet-fields:acl-ip-header-fields;
            uses packet-fields:acl-ipv4-header-fields;
          }
          container ipv6 {
            description
              "Rule set that matches the IPv6 header.";
            uses packet-fields:acl-ip-header-fields;
            uses packet-fields:acl-ipv6-header-fields;
          }
        }
        choice l4 {
          description
            "Includes Layer-4-specific information.
             This version focuses on TCP and UDP.";
          container tcp {
            description
              "Rule set that matches the TCP header.";
            uses packet-fields:acl-tcp-header-fields;
            uses vpn-common:ports;
          }
          container udp {
            description
              "Rule set that matches the UDP header.";
            uses packet-fields:acl-udp-header-fields;
            uses vpn-common:ports;
          }
        }
      }
      case other {
        description
          "TODO";
      }
    }
  }

  grouping te-ref {
    description
      "Reference to TE paths";
    leaf-list te-tunnel {
      type te:tunnel-ref;
      description
        "Reference to TE Tunnels";
      reference
        "I-D.ietf-teas-yang-te: A YANG Data Model for Traffic
         Engineering Tunnels and Interfaces";
    }
    list sr-policy {
      key "headend policy-color-ref policy-endpoint-ref";
      description
        "SR Policy";
      reference
        "I-D.ietf-spring-sr-policy-yang: YANG Data Model for
         Segment Routing Policy";
      /*Headend needs to be added*/
      leaf headend {
        type inet:ip-address-no-zone;
        description
          "SR Policy headend";
      }
      leaf policy-color-ref {
        type leafref {
          path "/rt:routing/sr-policy:segment-routing"
             + "/sr-policy:traffic-engineering/sr-policy:policies"
             + "/sr-policy:policy/sr-policy:color";
        }
        description
          "Reference to sr-policy color";
      }
      leaf policy-endpoint-ref {
        type leafref {
          path "/rt:routing/sr-policy:segment-routing"
             + "/sr-policy:traffic-engineering/sr-policy:policies"
             + "/sr-policy:policy/sr-policy:endpoint";
        }
        description
          "Reference to sr-policy endpoint";
      }
    }
    container other {
      description
        "To dp - VN, IETF Network Slice, SFC, etc";
    }
  }

  /* Configuration data nodes */

  container traffic-map {
    description
      "AP configurations";
    list maps {
      key "id";
      description
        "traffic map identifier";
      leaf id {
        type string;
        description
          "The identifier for Traffic Maps";
      }
      container traffic {
        description
          "The traffic description";
        uses traffic-description;
      }
      container action {
        description
          "The action is limited to identifying the TE resource";
        uses te-ref;
      }
      container stats {
        config false;
        description
          "Statistics";
        leaf matched-packets {
          type yang:counter64;
          description
            "The number of packets that matched the traffic
             description";
        }
        leaf matched-octets {
          type yang:counter64;
          description
            "The number of octets (byte) that matched the traffic
             description";
        }
      }
    }
  }
}

<CODE ENDS>

5. Security Considerations

TBD

6. IANA Considerations

IANA is requested to make the following allocation for the URIs in the "ns" registry within the "IETF XML Registry Group" [RFC3688]:

   --------------------------------------------------------------------
   URI: urn:ietf:params:xml:ns:yang:ietf-traffic-map
   Registrant Contact: The IESG.
   XML: N/A, the requested URI is an XML namespace.
   --------------------------------------------------------------------

IANA is requested to make the following allocation for the YANG module in the "YANG Module Names" registry [RFC6020]:

   --------------------------------------------------------------------
   name:         ietf-traffic-map
   namespace:    urn:ietf:params:xml:ns:yang:ietf-traffic-map
   prefix:       tm
   reference:    RFC XXXX
   --------------------------------------------------------------------

7. References

7.1. Normative References

[I-D.ietf-spring-sr-policy-yang]
Raza, S. K., Saleh, T., Shunwan, Z., Voyer, D., Durrani, M., Matsushima, S., and V. P. Beeram, "YANG Data Model for Segment Routing Policy", Work in Progress, Internet-Draft, draft-ietf-spring-sr-policy-yang-03, , <https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-policy-yang-03>.
[I-D.ietf-teas-ietf-network-slice-nbi-yang]
Wu, B., Dhody, D., Rokui, R., Saad, T., and J. Mullooly, "A YANG Data Model for the RFC 9543 Network Slice Service", Work in Progress, Internet-Draft, draft-ietf-teas-ietf-network-slice-nbi-yang-16, , <https://datatracker.ietf.org/doc/html/draft-ietf-teas-ietf-network-slice-nbi-yang-16>.
[I-D.ietf-teas-yang-te]
Saad, T., Gandhi, R., Liu, X., Beeram, V. P., and I. Bryskin, "A YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths and Interfaces", Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-37, , <https://datatracker.ietf.org/doc/html/draft-ietf-teas-yang-te-37>.
[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/rfc/rfc2119>.
[RFC3688]
Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, , <https://www.rfc-editor.org/rfc/rfc3688>.
[RFC6020]
Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, , <https://www.rfc-editor.org/rfc/rfc6020>.
[RFC6991]
Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, , <https://www.rfc-editor.org/rfc/rfc6991>.
[RFC7950]
Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, , <https://www.rfc-editor.org/rfc/rfc7950>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/rfc/rfc8174>.
[RFC8340]
Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, , <https://www.rfc-editor.org/rfc/rfc8340>.
[RFC8349]
Lhotka, L., Lindem, A., and Y. Qu, "A YANG Data Model for Routing Management (NMDA Version)", RFC 8349, DOI 10.17487/RFC8349, , <https://www.rfc-editor.org/rfc/rfc8349>.
[RFC8519]
Jethanandani, M., Agarwal, S., Huang, L., and D. Blair, "YANG Data Model for Network Access Control Lists (ACLs)", RFC 8519, DOI 10.17487/RFC8519, , <https://www.rfc-editor.org/rfc/rfc8519>.
[RFC9181]
Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M., Ed., and Q. Wu, "A Common YANG Data Model for Layer 2 and Layer 3 VPNs", RFC 9181, DOI 10.17487/RFC9181, , <https://www.rfc-editor.org/rfc/rfc9181>.

7.2. Informative References

[RFC8955]
Loibl, C., Hares, S., Raszuk, R., McPherson, D., and M. Bacher, "Dissemination of Flow Specification Rules", RFC 8955, DOI 10.17487/RFC8955, , <https://www.rfc-editor.org/rfc/rfc8955>.
[RFC9168]
Dhody, D., Farrel, A., and Z. Li, "Path Computation Element Communication Protocol (PCEP) Extension for Flow Specification", RFC 9168, DOI 10.17487/RFC9168, , <https://www.rfc-editor.org/rfc/rfc9168>.

Appendix A. Acknowledgments

Thanks to Adrian Farrel for the motivation behind this document.

Appendix B. Examples

To be added in future revisions.

Author's Address

Dhruv Dhody
Huawei
India