Internet A. Lindem Internet-Draft LabN Consulting, L.L.C. Intended status: Standards Track Y. Qu Expires: 6 March 2025 Futurewei Technologies S. Litkowski Cisco Systems 2 September 2024 IS-IS YANG Model Augmentations for Additional Features - Version 1 draft-ietf-lsr-isis-yang-augmentation-v1-08 Abstract This document defines YANG data modules augmenting the IETF IS-IS YANG model to provide support for IS-IS Minimum Remaining Lifetime as defined in RFC 7987, IS-IS Application-Specific Link Attributes as defined in RFC 9479, IS-IS Flexible Algorithm as defined in RFC 9350, and Signaling Maximum SID Depth Using IS-IS as defined in RFC 8491. 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 6 March 2025. Copyright Notice Copyright (c) 2024 IETF Trust and the persons identified as the document authors. All rights reserved. Lindem, et al. Expires 6 March 2025 [Page 1] Internet-Draft ISIS YANG Augments V1 September 2024 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. Table of Contents 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 1.2. Tree diagram . . . . . . . . . . . . . . . . . . . . . . 3 2. YANG Module for IS-IS Minimum Remaining Lifetime . . . . . . 3 3. YANG Module for IS-IS Application-Specific Link Attributes . 5 4. YANG Module for IS-IS Flexible Algorithm . . . . . . . . . . 15 5. YANG Module for IS-IS Maximum SID Depth . . . . . . . . . . . 28 6. Security Considerations . . . . . . . . . . . . . . . . . . . 32 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 33 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 34 9. Normative References . . . . . . . . . . . . . . . . . . . . 34 10. Informative References . . . . . . . . . . . . . . . . . . . 36 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 36 1. Overview YANG [RFC7950] is a data definition language used to define the contents of a conceptual data store that allows networked devices to be managed using NETCONF [RFC6241]. YANG is proving relevant beyond its initial confines, as bindings to other interfaces (e.g., ReST) and encodings other than XML (e.g., JSON) are being defined. Furthermore, YANG data models can be used as the basis for implementation of other interfaces, such as CLI and programmatic APIs. This document defines YANG data modules augmenting the IETF IS-IS YANG model [RFC9130], which itself augments [RFC8349], to provide support for configuration and operational state for the following IS- IS features: RFC7987: IS-IS Minimum Remaining Lifetime[RFC7987]. RFC9479: IS-IS Application-Specific Link Attributes[RFC9479]. RFC9350: IGP Flexible Algorithm [RFC9350]. RFC8491: Signaling Maximum SID Depth (MSD) Using IS-IS [RFC8491]. Lindem, et al. Expires 6 March 2025 [Page 2] Internet-Draft ISIS YANG Augments V1 September 2024 The augmentations defined in this document require support for the IS-IS base model[RFC9130], which specifies the basic IS-IS configuration and state. The IS-IS YANG model augments the ietf- routing YANG model defined in [RFC8349]. 1.1. Requirements Language 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. 1.2. Tree diagram Tree diagrams used in this document follow the notation defined in [RFC8340]. 2. YANG Module for IS-IS Minimum Remaining Lifetime This document defines a YANG module for IS-IS Minimum Remaining Lifetime as defined in [RFC7987]. It is an augmentation of the IS-IS base model. module: ietf-isis-remaining-lifetime notifications: +---n corrupt-remaining-lifetime +--ro routing-protocol-name? -> /rt:routing /control-plane-protocols /control-plane-protocol/name +--ro isis-level? level +--ro lsp-id? isis:lsp-id file "ietf-isis-remaining-lifetime@2024-09-02.yang" module ietf-isis-remaining-lifetime { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-isis-remaining-lifetime"; prefix isis-remaining-lifetime; import ietf-isis { prefix "isis"; reference "RFC 9130: YANG Data Model for the IS-IS Protocol"; } Lindem, et al. Expires 6 March 2025 [Page 3] Internet-Draft ISIS YANG Augments V1 September 2024 organization "IETF LSR - Link State Routing Working Group"; contact "WG Web: WG List: Author: Yingzhen Qu Author: Acee Lindem Author: Stephane Litkowski "; description "This YANG module defines a notification which is sent when the IS-IS system detects corrupted lifetime of an LSP. This is for IS-IS Minimum Remaining Lifetime feature as defined in RFC 7987. 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 (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; reference "RFC XXXX"; revision 2024-09-02 { description "Initial version"; reference "RFC XXXX: A YANG Data Model for IS-IS Minimum Remaining Lifetime."; } notification corrupt-remaining-lifetime { uses isis:notification-instance-hdr; leaf lsp-id { type isis:lsp-id; description "LSP ID"; } Lindem, et al. Expires 6 March 2025 [Page 4] Internet-Draft ISIS YANG Augments V1 September 2024 description "This notification is sent when the system detects corrupted lifetime of an LSP."; reference "RFC 7987: IS-IS Minimum Remaining Lifetime"; } } 3. YANG Module for IS-IS Application-Specific Link Attributes This document defines a YANG module for IS-IS Application-Specific Link Attributes [RFC9479]. It is an augmentation of the IS-IS base model. module: ietf-isis-link-attr augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis: +--rw isis-link-attr-op +--rw (link-attr-op-mode) +--:(legacy) | +--rw legacy? empty +--:(transition) | +--rw transition? empty +--:(app-specific) +--rw app-specific? empty augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:interfaces /isis:interface: +--rw isis-asla +--rw interface-asla* [app-id] +--rw app-id uint16 +--rw unidirectional-link-delay? uint32 +--rw metric-type? uint8 +--rw metric? uint32 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:extended-is-neighbor /isis:neighbor/isis:instances/isis:instance: +--ro application-specific-link-attributes-sub-tlvs +--ro asla-sub-tlvs* [] +--ro l-flag? boolean +--ro sabm-length? uint8 +--ro r-flag? boolean +--ro udabm-length? uint8 +--ro sabm | +--ro sabm-bits* identityref +--ro udabm Lindem, et al. Expires 6 March 2025 [Page 5] Internet-Draft ISIS YANG Augments V1 September 2024 +--ro unknown-tlvs +--ro unknown-tlv* [] +--ro type? uint16 +--ro length? uint16 +--ro value? yang:hex-string augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:mt-is-neighbor/isis:neighbor /isis:instances/isis:instance: +--ro application-specific-link-attributes-sub-tlvs +--ro asla-sub-tlvs* [] +--ro l-flag? boolean +--ro sabm-length? uint8 +--ro r-flag? boolean +--ro udabm-length? uint8 +--ro sabm | +--ro sabm-bits* identityref +--ro udabm +--ro unknown-tlvs +--ro unknown-tlv* [] +--ro type? uint16 +--ro length? uint16 +--ro value? yang:hex-string augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp: +--ro application-specific-srlg-tlv +--ro as-srlg-tlvs* [] +--ro neighbor-system-id? isis:system-id +--ro pseudo-node-id? uint8 +--ro l-flag? boolean +--ro sabm-length? uint8 +--ro r-flag? boolean +--ro udabm-length? uint8 +--ro sabm | +--ro sabm-bits* identityref +--ro udabm +--ro length-of-sub-tlvs? uint8 +--ro link-id-sub-tlvs | +--ro link-local-remote-ids | | +--ro link-local-id? union | | +--ro link-remote-id? union | +--ro ipv4-interface-addr | | +--ro ipv4-int-addr? inet:ipv4-address | +--ro ipv4-neighbor-addr | | +--ro ipv4-neighbor-addr? inet:ipv4-address | +--ro ipv6-interface-addr | | +--ro ipv6-int-addr? inet:ipv6-address Lindem, et al. Expires 6 March 2025 [Page 6] Internet-Draft ISIS YANG Augments V1 September 2024 | +--ro ipv6-neighbor-addr | +--ro ipv6-neighbor-addr? inet:ipv6-address +--ro srlgs +--ro srlg* uint32 file "ietf-isis-link-attr@2024-09-02.yang" module ietf-isis-link-attr { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-isis-link-attr"; prefix isis-link-attr; import ietf-inet-types { prefix inet; reference "RFC 6991 - Common YANG Data Types"; } import ietf-routing { prefix "rt"; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA Version)"; } import ietf-isis { prefix "isis"; reference "RFC 9130: YANG Data Model for the IS-IS Protocol"; } organization "IETF LSR - Link State Routing Working Group"; contact "WG Web: WG List: Author: Yingzhen Qu Author: Acee Lindem Author: Stephane Litkowski "; description "This YANG module defines the configuration and operational state for IS-IS application specific link attributes feature as defined in RFC 9479. Lindem, et al. Expires 6 March 2025 [Page 7] Internet-Draft ISIS YANG Augments V1 September 2024 This YANG model conforms to the Network Management Datastore Architecture (NMDA) as described in RFC 8342. 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 (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; reference "RFC XXXX"; revision 2024-09-02 { description "Initial version"; reference "RFC XXXX: A YANG Data Model for IS-IS Application-Specific Link Attributes."; } identity sabm-bit { description "Base identity for sabm bits."; reference "RFC 8919: IS-IS Application-Specific Link Attributes"; } identity rsvp-te-bit { base sabm-bit; description "R bit, RSVP-TE."; } identity sr-policy-bit { base sabm-bit; description "S bit, Segment Routing Policy."; Lindem, et al. Expires 6 March 2025 [Page 8] Internet-Draft ISIS YANG Augments V1 September 2024 } identity lfa-bit { base sabm-bit; description "F bit, Loop Free Alternate (LFA). Includes all LFA types."; } grouping application-identifier-bit-mask { description "Identification of the set of applications associated with link attribute advertisements"; leaf l-flag { type boolean; description "Legacy Flag. When set, all of the applications specified in the bit mask MUST use the legacy advertisements."; } leaf sabm-length { type uint8; description "Standard Application Identifier Bit Mask Length in octets."; } leaf r-flag { type boolean; default false; description "Reserved."; } leaf udabm-length { type uint8; description "User Defined Application Identifier Bit Mask Length in octets."; } container sabm { leaf-list sabm-bits { type identityref { base sabm-bit; } description "SABM bits list. This list will contain identities for the bits which are set in the SABA bits."; } Lindem, et al. Expires 6 March 2025 [Page 9] Internet-Draft ISIS YANG Augments V1 September 2024 description "Standard Application Identifier Bit Mask."; } container udabm { description "User Defined Application Identifier Bit Mask. This container is to be augmented by user defined applications."; } } grouping application-specific-link-attributes-sub-tlv { description "Grouping for specification of the applications and application-specific attribute values."; container application-specific-link-attributes-sub-tlvs { list asla-sub-tlvs { uses application-identifier-bit-mask; uses isis:unknown-tlvs; description "List of application specific link attributes sub-tlvs."; } description "Application specific link attributes sub-tlv."; } } grouping application-specific-srlg-tlv { description "Grouping of a TLV to advertise application-specific SRLGs for a given link."; container application-specific-srlg-tlv { list as-srlg-tlvs { leaf neighbor-system-id { type isis:system-id; description "Neighbor System-ID."; } leaf pseudo-node-id { type uint8; description "Pseudo-node ID."; } uses application-identifier-bit-mask; leaf length-of-sub-tlvs { type uint8; description Lindem, et al. Expires 6 March 2025 [Page 10] Internet-Draft ISIS YANG Augments V1 September 2024 "Length of sub-tlvs."; } container link-id-sub-tlvs { description "Link Identifier sub-TLVs."; container link-local-remote-ids { description "Link local/remote identifier sub-tlv."; leaf link-local-id { type union { type inet:ipv4-address; type uint32; } description "Local identifier of the link. It could be an IPv4 address or a local identifier."; } leaf link-remote-id { type union { type inet:ipv4-address; type uint32; } description "Remote identifier of the link. It could be an IPv4 address or a remotely learned identifier."; } } container ipv4-interface-addr { leaf ipv4-int-addr { type inet:ipv4-address; description "IPv4 address for the interface."; } description "IPv4 interface address sub-tlv."; } container ipv4-neighbor-addr { leaf ipv4-neighbor-addr { type inet:ipv4-address; description "IPv4 address for a neighboring router on this link."; } description "IPv4 neighbor address sub-tlv."; } Lindem, et al. Expires 6 March 2025 [Page 11] Internet-Draft ISIS YANG Augments V1 September 2024 container ipv6-interface-addr { leaf ipv6-int-addr { type inet:ipv6-address; description "IPv6 address for the interface."; } description "IPv6 interface address sub-tlv."; } container ipv6-neighbor-addr { leaf ipv6-neighbor-addr { type inet:ipv6-address; description "IPv6 address for a neighboring router on this link."; } description "IPv6 neighbor address sub-tlv."; } } container srlgs { description "List of SRLGs."; leaf-list srlg { type uint32; description "SRLG value of the link."; } } description "List of application specific SRLG tlvs."; } description "Application specific SRLG tlv."; } } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol configuration Lindem, et al. Expires 6 March 2025 [Page 12] Internet-Draft ISIS YANG Augments V1 September 2024 with application specific link attributes."; container isis-link-attr-op { choice link-attr-op-mode { mandatory "true"; leaf legacy { type empty; description "Only send legacy advertisements."; } leaf transition { type empty; description "Send both application-specific and legacy advertisements."; } leaf app-specific{ type empty; description "Only send application-specific advertisements."; } description "Link attributes mode"; } description "Link attributes operation mode."; } } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:interfaces/isis:interface" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/"+ "rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used."; } description "This augments ISIS interface configuration with application specific link attributes."; container isis-asla { list interface-asla { key app-id; leaf app-id { Lindem, et al. Expires 6 March 2025 [Page 13] Internet-Draft ISIS YANG Augments V1 September 2024 type uint16 { range "0 .. 1023"; } description "Application ID. 0 - RSVP TE. 1 - Segment Routing Policy. 2 - Loop-Free Alternate."; } leaf unidirectional-link-delay { type uint32 { range "0 .. 16777215"; } description "This 24-bit field carries the average link delay in microseconds."; } leaf metric-type { type uint8; description "IGP metric type."; } leaf metric { type uint32 { range "1 .. 16777215"; } description "metric value."; } description "ASLA interface configuration."; } description "Application specific link attributes configuration."; } } /* TLV 22 */ augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:extended-is-neighbor/isis:neighbor"+ "/isis:instances/isis:instance" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/rt:type = 'isis:isis'" { Lindem, et al. Expires 6 March 2025 [Page 14] Internet-Draft ISIS YANG Augments V1 September 2024 description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB TLV22."; uses application-specific-link-attributes-sub-tlv; } /* TLV 223 */ augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:mt-is-neighbor/isis:neighbor"+ "/isis:instances/isis:instance" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB TLV223."; uses application-specific-link-attributes-sub-tlv; } /* application-specific SRLG TLV 238 */ augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB."; uses application-specific-srlg-tlv; } } 4. YANG Module for IS-IS Flexible Algorithm This document defines a YANG module for IS-IS Flexible Algorithm [RFC9350]. It is an augmentation of the IS-IS base model. Lindem, et al. Expires 6 March 2025 [Page 15] Internet-Draft ISIS YANG Augments V1 September 2024 module: ietf-isis-flex-algo augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis: +--rw isis-flex-algo +--rw flex-algo* [algo-number] +--rw algo-number uint8 +--rw advertise-definition? boolean +--rw admin-groups {te-types:extended-admin-groups, te-types:named-extended-admin-groups}? | +--rw exclude-admin-groups* -> /te:te/globals /named-admin-groups /named-admin-group/name | +--rw include-any-admin-groups* -> /te:te/globals /named-admin-groups /named-admin-group/name | +--rw include-all-admin-groups* -> /te:te/globals /named-admin-groups /named-admin-group/name +--rw exclude-srlgs* -> /te:te/globals /named-srlgs/named-srlg/name {te-types:named-srlg-groups}? +--rw fast-reroute? boolean +--rw metric-type? identityref +--rw microloop-avoidance? boolean +--rw prefix-metric! +--rw priority? uint8 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:router-capabilities: +--ro fad-tlvs +--ro fad-tlv* [] +--ro flex-algo? uint8 +--ro metric-type? identityref +--ro calc-type? uint8 +--ro priority? uint8 +--ro fa-ex-ag-sub-tlv | +--ro extended-admin-groups* uint64 +--ro fa-in-any-ag-sub-tlv | +--ro extended-admin-groups* uint64 +--ro fa-in-all-ag-sub-tlv | +--ro extended-admin-groups* uint64 +--ro fad-flags-sub-tlv | +--ro fad-flags* identityref +--ro fa-ex-srlg-sub-tlv | +--ro srlgs* uint32 +--ro unknown-tlvs +--ro unknown-tlv* [] +--ro type? uint16 Lindem, et al. Expires 6 March 2025 [Page 16] Internet-Draft ISIS YANG Augments V1 September 2024 +--ro length? uint16 +--ro value? yang:hex-string augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:extended-ipv4-reachability /isis:prefixes: +--ro fapm-sub-tlvs +--ro fapm-sub-tlv* [] +--ro flex-algo? uint8 +--ro metric? uint32 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:mt-extended-ipv4-reachability /isis:prefixes: +--ro fapm-sub-tlvs +--ro fapm-sub-tlv* [] +--ro flex-algo? uint8 +--ro metric? uint32 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:ipv6-reachability/isis:prefixes: +--ro fapm-sub-tlvs +--ro fapm-sub-tlv* [] +--ro flex-algo? uint8 +--ro metric? uint32 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:mt-ipv6-reachability /isis:prefixes: +--ro fapm-sub-tlvs +--ro fapm-sub-tlv* [] +--ro flex-algo? uint8 +--ro metric? uint32 notifications: +---n flex-algo-not-supported +--ro routing-protocol-name? -> /rt:routing /control-plane-protocols /control-plane-protocol/name +--ro isis-level? level +--ro flex-algo-number? uint8 Lindem, et al. Expires 6 March 2025 [Page 17] Internet-Draft ISIS YANG Augments V1 September 2024 file "ietf-isis-flex-algo@2024-09-02.yang" module ietf-isis-flex-algo { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-isis-flex-algo"; prefix isis-flex-algo; import ietf-routing { prefix rt; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA Version)"; } import ietf-te-types { prefix te-types; reference "RFC8776: Common YANG Data Types for Traffic Engineering."; } import ietf-isis { prefix "isis"; reference "RFC 9130: YANG Data Model for the IS-IS Protocol"; } import ietf-te { prefix "te"; } import ietf-isis-link-attr { prefix "isis-link-attr"; } organization "IETF LSR - Link State Routing Working Group"; contact "WG Web: WG List: Author: Yingzhen Qu Author: Acee Lindem Author: Stephane Litkowski "; Lindem, et al. Expires 6 March 2025 [Page 18] Internet-Draft ISIS YANG Augments V1 September 2024 description "The YANG module defines the configuration and operational state for ISIS Flexible Algorithm as defined in RFC 9350. This YANG model conforms to the Network Management Datastore Architecture (NMDA) as described in RFC 8342. 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. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; reference "RFC XXXX: YANG Data Model for ISIS Flexible Algorithm."; revision 2024-09-02 { description "Initial Version"; reference "RFC XXXX: YANG Data Model for ISIS Flexible Algorithm."; } /* Identities */ identity metric-type { description "Base identity for route metric types."; } identity igp-metric { base metric-type; description "Identity for the IGP metric type."; Lindem, et al. Expires 6 March 2025 [Page 19] Internet-Draft ISIS YANG Augments V1 September 2024 } identity min-uni-delay { base metric-type; description "Min unidirectional link delay metric type."; reference "RFC 8570 - IS-IS Traffic Engineering (TE) Metric Extensions"; } identity te-metric { base metric-type; description "Traffic engineering metric type."; reference "RFC 5305 - IS-IS Extensions for Traffic Engineering (TE)"; } identity fad-flags { description "Base identity for ISIS FAD flags."; } identity m-bit { base fad-flags; description "M bit, when set, the flex-algo specific prefix and ASBR metric MUST be used for inter-area and external prefix calculation."; } /* Identity augmentation */ identity flex-algo-bit { base isis-link-attr:sabm-bit; description "X bit, flexible algorithm."; } /* Groupings */ grouping fa-ex-ag-sub-tlv { container fa-ex-ag-sub-tlv { leaf-list extended-admin-groups { type uint64; description "Extended administrative group as defined in RFC 7308."; } description "The flex-algo exclude admin group sub-tlv."; Lindem, et al. Expires 6 March 2025 [Page 20] Internet-Draft ISIS YANG Augments V1 September 2024 } description "The flex-algo exclude admin group sub-tlv."; } grouping fa-in-any-ag-sub-tlv { container fa-in-any-ag-sub-tlv { leaf-list extended-admin-groups { type uint64; description "Extended administrative group as defined in RFC 7308."; } description "The flex-algo include-any admin group sub-tlv."; } description "The flex-algo include-any admin group sub-tlv."; } grouping fa-in-all-ag-sub-tlv { container fa-in-all-ag-sub-tlv { leaf-list extended-admin-groups { type uint64; description "Extended administrative group as defined in RFC 7308."; } description "The flex-algo include-all admin group sub-tlv."; } description "The flex-algo include-all admin group sub-tlv."; } grouping fad-flags-sub-tlv { container fad-flags-sub-tlv { leaf-list fad-flags { type identityref { base fad-flags; } description "Flex-algo definition flags list."; } description "ISIS flex-algo definition flags."; } description "The flex-algo definition flags sub-tlv."; } Lindem, et al. Expires 6 March 2025 [Page 21] Internet-Draft ISIS YANG Augments V1 September 2024 grouping fa-ex-srlg-sub-tlv { container fa-ex-srlg-sub-tlv { leaf-list srlgs { type uint32; description "SRLG value as defined in RFC 4203."; } description "The flex-algo exclude SRLG sub-tlv."; } description "The flex-algo exclude SRLG sub-tlv."; } grouping fad-tlvs { container fad-tlvs { list fad-tlv { leaf flex-algo { type uint8; description "Flex-algo number, value between 128 and 255 inclusive."; } leaf metric-type { type identityref { base metric-type; } description "Type of metric to be used during the calculation."; } leaf calc-type { type uint8 { range "0..127"; } description "IGP algorithm types, value from 0 to 127 as defined under 'Interior Gateway Protocol (IGP) Parameter' by IANA."; } leaf priority { type uint8; description "Priority of the advertisement."; } uses fa-ex-ag-sub-tlv; uses fa-in-any-ag-sub-tlv; uses fa-in-all-ag-sub-tlv; uses fad-flags-sub-tlv; Lindem, et al. Expires 6 March 2025 [Page 22] Internet-Draft ISIS YANG Augments V1 September 2024 uses fa-ex-srlg-sub-tlv; uses isis:unknown-tlvs; description "List of flex-algo definition TLVs."; } description "ISIS Flexible Algorithm Definition TLV."; } description "ISIS Flexible Algorithm Definition (FAD) TLV."; } grouping fapm-sub-tlvs { container fapm-sub-tlvs { list fapm-sub-tlv { leaf flex-algo { type uint8; description "Flex-algo number, value between 128 and 255 inclusive."; } leaf metric { type uint32; description "Prefix metric."; } description "List of flex-algo prefix sub-tlvs."; } description "Flex-algo prefix metric sub-tlvs."; } description "Flexible Algorithm Prefix Metric (FAPM) sub TLVs."; } /* Configurations */ augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } Lindem, et al. Expires 6 March 2025 [Page 23] Internet-Draft ISIS YANG Augments V1 September 2024 description "This augments ISIS protocol configuration with flexible algorithm."; container isis-flex-algo { list flex-algo { key "algo-number"; leaf algo-number { type uint8 { range "128..255"; } description "An identifier in the range 128-255 that's associated with the Flexible Algorithm Definition."; } leaf advertise-definition { type boolean; default true; description "Enable to advertise the flex-algo definition."; } container admin-groups { if-feature "te-types:extended-admin-groups"; if-feature "te-types:named-extended-admin-groups"; leaf-list exclude-admin-groups { type leafref { path "/te:te/te:globals/te:named-admin-groups/" + "te:named-admin-group/te:name"; } description "Exclude rule used during the flex-algo path computation."; } leaf-list include-any-admin-groups { type leafref { path "/te:te/te:globals/te:named-admin-groups/" + "te:named-admin-group/te:name"; } description "Include-any rule used during the flex-algo path computation."; } leaf-list include-all-admin-groups { type leafref { path "/te:te/te:globals/te:named-admin-groups/" Lindem, et al. Expires 6 March 2025 [Page 24] Internet-Draft ISIS YANG Augments V1 September 2024 + "te:named-admin-group/te:name"; } description "Include-all rule used during the flex-algo path computation."; } description "Specify links for the flex-algo path computation."; } leaf-list exclude-srlgs { if-feature "te-types:named-srlg-groups"; type leafref { path "/te:te/te:globals/te:named-srlgs/te:named-srlg/" + "te:name"; } description "Shared Risk Link Groups (SRLGs) to be excluded during the flex-algo path computation."; } leaf fast-reroute { type boolean; default true; description "Enable fast reroute."; } leaf metric-type { type identityref { base metric-type; } description "Type of metric to be used during the calculation."; } leaf microloop-avoidance { type boolean; default true; description "Enable microloop avoidance."; } container prefix-metric { presence "Use flex-algo specific prefix metric."; description "Use flex-algo prefix metric."; Lindem, et al. Expires 6 March 2025 [Page 25] Internet-Draft ISIS YANG Augments V1 September 2024 } leaf priority { type uint8; description "Priority of the advertisement."; } description "List of flex-algo configurations."; } description "Flexible Algorithm configuration."; } } /* Database */ augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:router-capabilities" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/"+ "rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB router capability."; uses fad-tlvs; } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:extended-ipv4-reachability/"+ "isis:prefixes" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/"+ "rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB prefix."; uses fapm-sub-tlvs; Lindem, et al. Expires 6 March 2025 [Page 26] Internet-Draft ISIS YANG Augments V1 September 2024 } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:mt-extended-ipv4-reachability/isis:prefixes" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/"+ "rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB prefix."; uses fapm-sub-tlvs; } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:ipv6-reachability/isis:prefixes" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/"+ "rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB prefix."; uses fapm-sub-tlvs; } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol"+ "/isis:isis/isis:database/isis:levels/isis:lsp"+ "/isis:mt-ipv6-reachability/isis:prefixes" { when "/rt:routing/rt:control-plane-protocols/"+ "rt:control-plane-protocol/"+ "rt:type = 'isis:isis'" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB prefix."; uses fapm-sub-tlvs; } /* notification */ Lindem, et al. Expires 6 March 2025 [Page 27] Internet-Draft ISIS YANG Augments V1 September 2024 notification flex-algo-not-supported { uses isis:notification-instance-hdr; leaf flex-algo-number { type uint8 { range "128..255"; } description "Flex-algo identifier which is not supported by the IS-IS instance."; } description "This notification is sent when an IS-IS instance does not support this flex-algo."; } } 5. YANG Module for IS-IS Maximum SID Depth This document defines a module for Signaling Maximum SID Depth (MSD) using IS-IS [RFC8491]. It is an augmentation of the IS-IS base model. The figure below describes the overall structure of the isis-msd YANG module: Lindem, et al. Expires 6 March 2025 [Page 28] Internet-Draft ISIS YANG Augments V1 September 2024 module: ietf-isis-msd augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:router-capabilities: +--ro node-msd-tlv +--ro node-msds* [msd-type] +--ro msd-type identityref +--ro msd-value? uint8 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:extended-is-neighbor /isis:neighbor: +--ro link-msd-sub-tlv +--ro link-msds* [msd-type] +--ro msd-type identityref +--ro msd-value? uint8 augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/isis:isis/isis:database /isis:levels/isis:lsp/isis:mt-is-neighbor/isis:neighbor: +--ro link-msd-sub-tlv +--ro link-msds* [msd-type] +--ro msd-type identityref +--ro msd-value? uint8 Figure 1 file "ietf-isis-msd@2024-09-02.yang" module ietf-isis-msd { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-isis-msd"; prefix isis-msd; import ietf-routing { prefix rt; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA Version)"; } import ietf-isis { prefix isis; reference "RFC 9130: YANG Data Model for the IS-IS Protocol"; } import ietf-mpls-msd { prefix mpls-msd; } Lindem, et al. Expires 6 March 2025 [Page 29] Internet-Draft ISIS YANG Augments V1 September 2024 organization "IETF LSR - LSR Working Group"; contact "WG Web: WG List: Author: Yingzhen Qu Author: Acee Lindem Author: Stephane Litkowski Author: Jeff Tantsura "; description "The YANG module augments the base ISIS model to manage different types of MSDs. This YANG model conforms to the Network Management Datastore Architecture (NMDA) as described in RFC 8342. 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 (https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself for full legal notices. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; reference "RFC XXXX: YANG Data Model for ISIS MSD"; revision 2024-09-02 { description "Initial Version"; Lindem, et al. Expires 6 March 2025 [Page 30] Internet-Draft ISIS YANG Augments V1 September 2024 reference "RFC XXXX: YANG Data Model for ISIS MSD."; } grouping link-msd-sub-tlv { description "Link Maximum SID Depth (MSD) grouping for an interface."; container link-msd-sub-tlv { list link-msds { key "msd-type"; uses mpls-msd:msd-type-value; description "List of link MSDs"; } description "Link MSD sub-tlvs."; } } /* Node MSD TLV */ augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol" + "/isis:isis/isis:database/isis:levels/isis:lsp" + "/isis:router-capabilities" { when "derived-from-or-self(../../../../../rt:type," + "'isis:isis')" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB router capability."; container node-msd-tlv { list node-msds { key "msd-type"; uses mpls-msd:msd-type-value; description "Node MSD is the smallest link MSD supported by the node."; } description "Node MSD is the number of SIDs supported by a node."; reference "RFC 8491: Signaling Maximum SID Depth (MSD) Using IS-IS"; } } /* link MSD sub-tlv */ Lindem, et al. Expires 6 March 2025 [Page 31] Internet-Draft ISIS YANG Augments V1 September 2024 augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol" + "/isis:isis/isis:database/isis:levels/isis:lsp" + "/isis:extended-is-neighbor/isis:neighbor" { when "derived-from-or-self(../../../../../../rt:type," + "'isis:isis')" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB neighbor with Link MSD sub-TLV."; uses link-msd-sub-tlv; } augment "/rt:routing/" + "rt:control-plane-protocols/rt:control-plane-protocol" + "/isis:isis/isis:database/isis:levels/isis:lsp" + "/isis:mt-is-neighbor/isis:neighbor" { when "derived-from-or-self(../../../../../../rt:type," + "'isis:isis')" { description "This augment ISIS routing protocol when used"; } description "This augments ISIS protocol LSDB neighbor."; uses link-msd-sub-tlv; } } Figure 2 6. Security Considerations The YANG modules specified in this document define a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446]. The NETCONF access control model [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a pre- configured subset of all available NETCONF or RESTCONF protocol operations and content. Lindem, et al. Expires 6 March 2025 [Page 32] Internet-Draft ISIS YANG Augments V1 September 2024 There are a number of data nodes defined in the modules that 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. These correspond to the following schema nodes: /isis:isis/isis:interfaces/isis:interface/isis-link-attr - Modification of link attributes operation mode could result in traffic being redirected or DoS attack. Some of the readable data nodes in the modules may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. The exposure of the Link State Database (LSDB) will expose the detailed topology of the network. This may be undesirable since both due to the fact that exposure may facilitate other attacks. Additionally, network operators may consider their topologies to be sensitive confidential data.These correspond to the following schema nodes: /isis:isis/isis:database/isis:levels/isis:lsp/isis:mt-is- neighbor/isis:neighbor/isis:instances/isis:instance/application- specific-link-attributes-sub-tlvs /isis:isis/isis:database/isis:levels/isis:lsp/application- specific-srlg-tlv /isis:router-capabilities/node-msd-tlv /isis:isis/isis:database/isis:levels/isis:lsp//isis:extended-is- neighbor/isis:neighbor/link-msd-sub-tlv /isis:isis/isis:database/isis:levels/isis:lsp//isis:mt-is- neighbor/isis:neighbor/link-msd-sub-tlv 7. IANA Considerations This document registers URIs in the IETF XML registry [RFC3688]. Following the format in [RFC3688], the following registrations is requested to be made: URI: urn:ietf:params:xml:ns:yang:ietf-isis-remaining-lifetime Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. Lindem, et al. Expires 6 March 2025 [Page 33] Internet-Draft ISIS YANG Augments V1 September 2024 URI: urn:ietf:params:xml:ns:yang:ietf-isis-link-attr Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-isis-flex-algo Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. URI: urn:ietf:params:xml:ns:yang:ietf-isis-msd Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace This document registers the YANG modules in the YANG Module Names registry [RFC6020]. name: ietf-isis-remaining-lifetime namespace: urn:ietf:params:xml:ns:yang:ietf-isis-remaining-lifetime prefix: isis-remaining-lifetime reference: RFC XXXX name: ietf-isis-link-attr namespace: urn:ietf:params:xml:ns:yang:ietf-isis-link-attr prefix: isis-link-attr reference: RFC XXXX name: ietf-isis-flex-algo namespace: urn:ietf:params:xml:ns:yang:ietf-isis-flex-algo prefix: isis-flex-algo reference: RFC XXXX name: ietf-isis-msd namespace: urn:ietf:params:xml:ns:yang:ietf-isis-msd prefix: isis-msd reference: RFC XXXX 8. Acknowledgements This document was produced using Marshall Rose's xml2rfc tool. The YANG model was developed using the suite of YANG tools written and maintained by numerous authors. 9. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Lindem, et al. Expires 6 March 2025 [Page 34] Internet-Draft ISIS YANG Augments V1 September 2024 [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC7987] Ginsberg, L., Wells, P., Decraene, B., Przygienda, T., and H. Gredler, "IS-IS Minimum Remaining Lifetime", RFC 7987, DOI 10.17487/RFC7987, October 2016, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [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, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . Lindem, et al. Expires 6 March 2025 [Page 35] Internet-Draft ISIS YANG Augments V1 September 2024 [RFC8491] Tantsura, J., Chunduri, U., Aldrin, S., and L. Ginsberg, "Signaling Maximum SID Depth (MSD) Using IS-IS", RFC 8491, DOI 10.17487/RFC8491, November 2018, . [RFC9130] Litkowski, S., Ed., Yeung, D., Lindem, A., Zhang, J., and L. Lhotka, "YANG Data Model for the IS-IS Protocol", RFC 9130, DOI 10.17487/RFC9130, October 2022, . [RFC9350] Psenak, P., Ed., Hegde, S., Filsfils, C., Talaulikar, K., and A. Gulko, "IGP Flexible Algorithm", RFC 9350, DOI 10.17487/RFC9350, February 2023, . [RFC9479] Ginsberg, L., Psenak, P., Previdi, S., Henderickx, W., and J. Drake, "IS-IS Application-Specific Link Attributes", RFC 9479, DOI 10.17487/RFC9479, October 2023, . 10. Informative References [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . Authors' Addresses Acee Lindem LabN Consulting, L.L.C. 301 Midenhall Way Cary, NC 27513 Email: acee.ietf@gmail.com Yingzhen Qu Futurewei Technologies United States of America Email: yingzhen.ietf@gmail.com Stephane Litkowski Cisco Systems Email: slitkows.ietf@gmail.com Lindem, et al. Expires 6 March 2025 [Page 36]