rfc9902v4.txt   rfc9902.txt 
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Internet Engineering Task Force (IETF) S. Litkowski Internet Engineering Task Force (IETF) S. Litkowski
Request for Comments: 9902 Cisco Systems Request for Comments: 9902 Cisco Systems
Category: Standards Track Y. Qu Category: Standards Track Y. Qu
ISSN: 2070-1721 Futurewei Technologies ISSN: 2070-1721 Futurewei Technologies
A. Lindem A. Lindem
LabN Consulting, L.L.C. LabN Consulting, L.L.C.
I. Chen I. Chen
Red Hat, Inc. Red Hat, Inc.
J. Tantsura J. Tantsura
Nvidia Nvidia
November 2025 December 2025
A YANG Data Model for IS-IS Segment Routing over the MPLS Data Plane A YANG Data Model for IS-IS Segment Routing over the MPLS Data Plane
Abstract Abstract
This document defines a YANG data model that can be used to manage This document defines a YANG data model that can be used to manage
IS-IS extensions for Segment Routing (SR) over the MPLS data plane. IS-IS extensions for Segment Routing (SR) over the MPLS data plane.
Status of This Memo Status of This Memo
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carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Revised BSD License text as described in Section 4.e of the include Revised BSD License text as described in Section 4.e of the
Trust Legal Provisions and are provided without warranty as described Trust Legal Provisions and are provided without warranty as described
in the Revised BSD License. in the Revised BSD License.
Table of Contents Table of Contents
1. Overview 1. Overview
1.1. Tree Diagrams 1.1. Tree Diagrams
2. Design of the IS-IS MPLS Segment Routing Module 2. Design of the YANG Module for IS-IS MPLS Segment Routing
2.1. Segment Routing Activation 2.1. Segment Routing Activation
2.2. Advertising Mapping Server Policy 2.2. Advertising Mapping Server Policy
2.3. IP Fast Reroute 2.3. IP Fast Reroute
3. IS-IS MPLS Segment Routing over MPLS YANG Module 3. IS-IS Segment Routing over MPLS YANG Module
4. Security Considerations 4. Security Considerations
5. IANA Considerations 5. IANA Considerations
6. References 6. References
6.1. Normative References 6.1. Normative References
6.2. Informative References 6.2. Informative References
Appendix A. A Configuration Example Appendix A. A Configuration Example
Appendix B. IS-IS MPLS Segment Routing Module Tree Appendix B. IS-IS MPLS Segment Routing Module Tree
Acknowledgements Acknowledgements
Authors' Addresses Authors' Addresses
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This document defines a device YANG data model [RFC7950] that can be This document defines a device YANG data model [RFC7950] that can be
used to manage IS-IS extensions for Segment Routing (SR) [RFC8667] used to manage IS-IS extensions for Segment Routing (SR) [RFC8667]
over the MPLS data plane. It is an augmentation to the IS-IS YANG over the MPLS data plane. It is an augmentation to the IS-IS YANG
data model [RFC9130]. data model [RFC9130].
1.1. Tree Diagrams 1.1. Tree Diagrams
This document uses the graphical representation of a data model as This document uses the graphical representation of a data model as
defined in [RFC8340]. defined in [RFC8340].
2. Design of the IS-IS MPLS Segment Routing Module 2. Design of the YANG Module for IS-IS MPLS Segment Routing
The IS-IS SR MPLS YANG module requires support for the base SR module The IS-IS SR MPLS YANG module requires support for the base SR module
[RFC9020], which defines the global SR management independent of any [RFC9020], which defines the global SR management independent of any
specific routing protocol configuration, and support of the IS-IS specific routing protocol configuration, and support of the IS-IS
base model [RFC9130], which defines the basic IS-IS configuration and base model [RFC9130], which defines the basic IS-IS configuration and
state. state.
The "ietf-isis-sr-mpls" data model defines both the data nodes to The "ietf-isis-sr-mpls" data model defines both the data nodes to
configure IS-IS SR MPLS extensions and the additions to the IS-IS configure IS-IS SR MPLS extensions and the additions to the IS-IS
Link State Protocol Data Units (LSPs) necessary to support MPLS SR. Link State Protocol Data Units (LSPs) necessary to support MPLS SR.
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The "bindings/receive" leaf controls the reception and process of The "bindings/receive" leaf controls the reception and process of
mapping server entries. mapping server entries.
2.3. IP Fast Reroute 2.3. IP Fast Reroute
The IS-IS SR MPLS module augments the Fast Reroute (FRR) container The IS-IS SR MPLS module augments the Fast Reroute (FRR) container
under interface. It brings the ability to activate Topology under interface. It brings the ability to activate Topology
Independent Loop-Free Alternate (TI-LFA) and also enhances Remote LFA Independent Loop-Free Alternate (TI-LFA) and also enhances Remote LFA
(RLFA) to use SR tunneling instead of LDP. (RLFA) to use SR tunneling instead of LDP.
3. IS-IS MPLS Segment Routing over MPLS YANG Module 3. IS-IS Segment Routing over MPLS YANG Module
[RFC6991], [RFC8102], [RFC8294], [RFC8349], [RFC8402], [RFC8667], [RFC6991], [RFC8102], [RFC8294], [RFC8349], [RFC8402], [RFC8667],
[RFC9020], [RFC9130], and [RFC9855] are referenced in the YANG [RFC9020], [RFC9130], and [RFC9855] are referenced in the YANG
module. module.
<CODE BEGINS> file "ietf-isis-sr-mpls@2025-11-21.yang" <CODE BEGINS> file "ietf-isis-sr-mpls@2025-11-21.yang"
module ietf-isis-sr-mpls { module ietf-isis-sr-mpls {
yang-version 1.1; yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-isis-sr-mpls"; namespace "urn:ietf:params:xml:ns:yang:ietf-isis-sr-mpls";
prefix isis-sr-mpls; prefix isis-sr-mpls;
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