TEAS Working Group D. Dhody
Internet-Draft Huawei Technologies
Intended status: Standards Track 7 March 2022
Expires: 8 September 2022
Traffic Mapping YANG model for Traffic Engineering (TE)
draft-dhody-teas-te-traffic-yang-01
Abstract
This document provides a YANG data model to map traffic to Traffic
Engineering (TE) paths. This model providers operator a seamless
control and management of which traffic to send on the underlying TE
resources.
Status of This Memo
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provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 8 September 2022.
Copyright Notice
Copyright (c) 2022 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 (https://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 Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Prefixes in Data Node Names . . . . . . . . . . . . . . . 4
2.3. References in the Model . . . . . . . . . . . . . . . . . 4
3. Discussion Items . . . . . . . . . . . . . . . . . . . . . . 5
4. Tree Structure . . . . . . . . . . . . . . . . . . . . . . . 5
5. YANG Model . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
8.1. Normative References . . . . . . . . . . . . . . . . . . 11
8.2. Informative References . . . . . . . . . . . . . . . . . 12
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 13
Appendix B. Examples . . . . . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 13
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 configuration or modeling of a variety of
network devices, protocol instances, and network services.
There are various YANG models to establish paths in the network, such
as:
* TE Tunnels [I-D.ietf-teas-yang-te]
* Segment Routing (SR) Policy [I-D.ietf-spring-sr-policy-yang]
* Service Function Chaining (SFC)
* Virtual Network (VN)
* IETF Network Slice
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:
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* BGP FlowSpec: Where the description of traffic flows is done by
the combination of multiple Flow Specification Components and
their dissemination as traffic flow specifications (Flow
Specifications) is described for BGP in [RFC8955]. In BGP, a Flow
Specification is comprised of traffic filtering rules and is
associated with actions to perform on the packets that match the
Flow Specification. The BGP routers that receive a Flow
Specification can classify received packets according to the
traffic filtering rules and can direct packets based on the
associated actions.
* Path Computation Element (PCE) FlowSpec: Extends the idea to PCE
Communication Protocol (PCEP) [RFC9168].
* Access Control List (ACL): A basic elements used to configure
device-forwarding behavior in form of a user-ordered set of rules
that is used to filter traffic on a networking device. Each rule
is represented by an Access Control Entry (ACE). Each ACE has a
group of match criteria and a group of actions [RFC8519].
The YANG model includes two key concepts:
* Traffic Description: The various fields that needs to be matched
to identify a traffic flow.
* Action: The associated action that needs to be taken. For the
purpose of this YANG model the action is to simply point to the TE
resource in form of the TE tunnel, SR Policy etc.
Note: The RFC Editor will replace XXXX with the number assigned to
the RFC once this draft becomes an RFC.
2. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2.1. 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].
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2.2. 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 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.
+========+==========+=============================================+
| Prefix | YANG | Reference |
| | module | |
+========+==========+=============================================+
| yang | ietf- | [RFC6991] |
| | yang- | |
| | types | |
+--------+----------+---------------------------------------------+
| te | ietf-te | [I-D.ietf-teas-yang-te] |
+--------+----------+---------------------------------------------+
| rt | ietf- | [RFC8349] |
| | routing | |
+--------+----------+---------------------------------------------+
| sr- | ietf-sr- | [I-D.ietf-spring-sr-policy-yang] |
| policy | policy | |
+--------+----------+---------------------------------------------+
| ietf- | ietf- | [I-D.ietf-teas-ietf-network-slice-nbi-yang] |
| ns | network- | |
| | slice | |
+--------+----------+---------------------------------------------+
| acl | ietf- | [RFC8519] |
| | access- | |
| | control- | |
| | list | |
+--------+----------+---------------------------------------------+
Table 1
2.3. References in the Model
Following documents are referenced in the model defined in this
document -
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+=============================+==================================+
| Document | Reference |
+=============================+==================================+
| YANG Data Model for Network | [RFC8519] |
| Access Control Lists (ACLs) | |
+-----------------------------+----------------------------------+
| A YANG Data Model for | [I-D.ietf-teas-yang-te] |
| Traffic Engineering Tunnels | |
| and Interfaces | |
+-----------------------------+----------------------------------+
| YANG Data Model for Segment | [I-D.ietf-spring-sr-policy-yang] |
| Routing Policy | |
+-----------------------------+----------------------------------+
Table 2
3. Discussion Items
For describing the traffic, currently the YANG models uses:
* The match criteria grouping from the
[I-D.ietf-teas-ietf-network-slice-nbi-yang]. If this document
gets WG backing, then it might be a good idea to move the grouping
to this document instead.
* The ACL Name. Should that be ACE instead?
* The match action granularity in case of IETF network slice and VN
needs to be discussed.
* The match action for SFC is not handled yet.
4. Tree Structure
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module: ietf-traffic-map
+--rw traffic-map
+--rw maps* [id]
+--rw id string
+--rw traffic
| +--rw id? string
| +--rw (type)?
| +--:(match-criteria)
| | +--rw ns-match-criteria
| | +--rw ns-match-criterion* [match-type]
| | +--rw match-type identityref
| | +--rw values* [index]
| | +--rw index uint8
| | +--rw value? string
| +--:(acl)
| | +--rw acl? -> /acl:acls/acl/name
| +--:(flowspec)
| +--:(other)
+--rw action
| +--rw te-tunnel* te:tunnel-ref
| +--rw sr-policy* [policy-color-ref policy-endpoint-ref]
| | +--rw policy-color-ref leafref
| | +--rw policy-endpoint-ref leafref
| +--rw other
+--ro stats
+--ro matched-packets? yang:counter64
+--ro matched-octets? yang:counter64
5. YANG Model
<CODE BEGINS> file "ietf-traffic-map@2022-03-07.yang"
module ietf-traffic-map {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-traffic-map";
prefix tm;
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 {
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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 {
prefix ietf-ns;
reference
"I-D.ietf-teas-ietf-network-slice-nbi-yang: IETF
Network Slice Service YANG Model";
}
import ietf-access-control-list {
prefix acl;
reference
"RFC8519: YANG Data Model for Network Access Control
Lists (ACLs)";
}
organization
"IETF Traffic Engineering Architecture and Signaling (TEAS)
Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/teas/about/>
WG List: <mailto:teas@ietf.org>
Editor: Dhruv Dhody <dhruv.ietf@gmail.com>";
description
"This module contains a YANG module to map traffic to
Traffic Engineering (TE) paths.
Copyright (c) 2022 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 2022-03-07 {
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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";
uses ietf-ns:ns-match-criteria;
}
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 other {
description
"TODO";
}
}
}
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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 "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 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 */
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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>
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6. Security Considerations
TBD
7. IANA Considerations
IANA is requested to make the following allocation for the URIs in
the "ns" subregistry within the "IETF XML Registry" [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
--------------------------------------------------------------------
8. References
8.1. Normative References
[I-D.ietf-spring-sr-policy-yang]
Raza, K., Sawaya, R., 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-01, 7 April 2021,
<https://www.ietf.org/archive/id/draft-ietf-spring-sr-
policy-yang-01.txt>.
[I-D.ietf-teas-ietf-network-slice-nbi-yang]
Wu, B., Dhody, D., Rokui, R., Saad, T., and L. Han, "IETF
Network Slice Service YANG Model", Work in Progress,
Internet-Draft, draft-ietf-teas-ietf-network-slice-nbi-
yang-01, 4 March 2022, <https://www.ietf.org/archive/id/
draft-ietf-teas-ietf-network-slice-nbi-yang-01.txt>.
[I-D.ietf-teas-yang-te]
Saad, T., Gandhi, R., Liu, X., Beeram, V. P., Bryskin, I.,
and O. G. D. Dios, "A YANG Data Model for Traffic
Engineering Tunnels, Label Switched Paths and Interfaces",
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Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-
29, 7 February 2022, <https://www.ietf.org/archive/id/
draft-ietf-teas-yang-te-29.txt>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://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,
<https://www.rfc-editor.org/info/rfc6020>.
[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
[RFC8349] Lhotka, L., Lindem, A., and Y. Qu, "A YANG Data Model for
Routing Management (NMDA Version)", RFC 8349,
DOI 10.17487/RFC8349, March 2018,
<https://www.rfc-editor.org/info/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, March 2019,
<https://www.rfc-editor.org/info/rfc8519>.
8.2. Informative References
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[RFC8955] Loibl, C., Hares, S., Raszuk, R., McPherson, D., and M.
Bacher, "Dissemination of Flow Specification Rules",
RFC 8955, DOI 10.17487/RFC8955, December 2020,
<https://www.rfc-editor.org/info/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, January
2022, <https://www.rfc-editor.org/info/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 Technologies
Divyashree Techno Park, Whitefield
Bangalore 560066
India
Email: dhruv.ietf@gmail.com
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