Network Working Group M. Pels Internet-Draft RIPE NCC Intended status: Standards Track 26 June 2025 Expires: 28 December 2025 A YANG Data Model for BGP Communities draft-ietf-grow-yang-bgp-communities-05 Abstract This document defines a YANG data model for the structured specification of BGP communities. The model provides operators with a way to publish their locally defined BGP communities in a standardized format. 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 28 December 2025. Copyright Notice Copyright (c) 2025 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. Pels Expires 28 December 2025 [Page 1] Internet-Draft BGP Community YANG June 2025 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Rationale . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. Tree view . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 5 6. Operational guidelines . . . . . . . . . . . . . . . . . . . 15 6.1. Publishing guidelines . . . . . . . . . . . . . . . . . . 15 6.2. Parsing guidelines . . . . . . . . . . . . . . . . . . . 15 7. IANA considerations . . . . . . . . . . . . . . . . . . . . . 16 7.1. YANG Namespace Registration . . . . . . . . . . . . . . . 16 7.2. YANG Module Registration . . . . . . . . . . . . . . . . 16 7.3. YANG SID Allocation . . . . . . . . . . . . . . . . . . . 16 8. Implementation status . . . . . . . . . . . . . . . . . . . . 16 8.1. Publishing implementations . . . . . . . . . . . . . . . 17 8.2. Parser implementations . . . . . . . . . . . . . . . . . 17 9. Security considerations . . . . . . . . . . . . . . . . . . . 18 9.1. Publishing considerations . . . . . . . . . . . . . . . . 18 9.2. Parsing considerations . . . . . . . . . . . . . . . . . 18 10. Normative References . . . . . . . . . . . . . . . . . . . . 19 11. Informative References . . . . . . . . . . . . . . . . . . . 20 Appendix A. JSON Examples . . . . . . . . . . . . . . . . . . . 22 A.1. RFC8195 Selective NO_EXPORT definition . . . . . . . . . 22 A.2. RFC4384 Data Collection definition . . . . . . . . . . . 24 Appendix B. Acknowledgements . . . . . . . . . . . . . . . . . . 25 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 25 1. Introduction ISPs use BGP communities to add information to their prefix announcements or to let customers influence routing behaviour inside the network of the ISP. Each ISP defines for itself which BGP communities to support and how the structure of these communities should be interpreted. This document provides a YANG[RFC7950] module for describing the structure and meaning of BGP communities[RFC1997], Extended BGP communities[RFC4360] and Large BGP communities[RFC8092]. ISPs can use this standardized format to publish their community definitions. Section 3 elaborates on further advantages of using such a standardized format. 2. Terminology 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. Pels Expires 28 December 2025 [Page 2] Internet-Draft BGP Community YANG June 2025 The meaning of the symbols in tree diagrams are defined in [RFC8340]. 3. Rationale ISPs may define various BGP communities that have local significance within their network. These communities could be used to add miscellaneous information to a prefix announcement. For example, a community "64501:1:528" may signify that the AS with ASN 64501 is originating a prefix from a point of presence in The Netherlands (ISO 3166-1 code 528). Communities could be used to allow customers of an ISP to control the routing behavior of their prefixes inside the ISP. For example, a community "64501:4:64498" attached to a prefix advertised to AS64501 by a customer may be interpreted by AS64501 to mean that this prefix must not be propagated to AS64498. For both use cases it is necessary for the ISP to communicate the meaning of their locally defined communities to others. Currently this is typically done by publishing a list of communities on a web page, or as a remark inside an "autnum" object in the Internet Routing Registry. This makes it cumbersome to determine whether and where an ISP publishes community information. The lack of a well- defined structure makes it hard to create a standardized publishing mechanism, and to develop tools for automatically parsing community information and eventually triggering configuration actions. The purpose of the YANG model defined in this document is to provide a standardized format for publishing community definitions. These definitions help applications to interpret the structure and purpose of BGP communities. For example, looking glasses may use the published definitions to parse communities seen in BGP announcements and display their meaning. Another potential use case is in generating routing policy configurations based on community definitions published by an upstream ASN. This could be achieved automatically using external tooling to generate router configurations, or inside a router's command-line interface by importing the definitions and providing the CLI-user with available choices for manual configuration. This document only describes a data model for the publishing format of community definitions. The publishing location and publishing mechanism used are outside the scope of this specification. The data model does not make any assumption about the protocol used to publish/retrieve formatted data following the model. 4. Tree view The following tree diagram provides an overview of the "ietf-bgp- communities" data model. Pels Expires 28 December 2025 [Page 3] Internet-Draft BGP Community YANG June 2025 module: ietf-bgp-communities +--ro bgp-communities +--ro serial? uint32 +--ro uri? inet:uri +--ro description? string +--ro contact-url? inet:uri +--ro contact* [email-address] | +--ro email-address inet:email-address | +--ro name? string | +--ro role? string | +--ro organization? string | +--ro organizational-unit? string +--ro regular* [name] | +--ro name community-name | +--ro category? community-category | +--ro description? community-description | +--ro global-admin two-octet-as-number | +--ro local-admin | +--ro format? local-admin-format | +--ro field* [name] | +--ro name field-name | +--ro length? uint8 | +--ro pattern field-pattern | +--ro description? field-description +--ro extended* [name] | +--ro name community-name | +--ro category? community-category | +--ro description? community-description | +--ro type uint8 | +--ro subtype uint8 | +--ro (global-admin) | | +--:(asn) | | | +--ro asn? two-octet-as-number | | +--:(asn4) | | +--ro asn4? inet:as-number | +--ro local-admin | +--ro format? local-admin-format | +--ro field* [name] | +--ro name field-name | +--ro length? uint8 | +--ro pattern field-pattern | +--ro description? field-description +--ro large* [name] +--ro name community-name +--ro category? community-category +--ro description? community-description +--ro global-admin inet:as-number +--ro local-data-part-1 Pels Expires 28 December 2025 [Page 4] Internet-Draft BGP Community YANG June 2025 | +--ro format? local-admin-format | +--ro field* [name] | +--ro name field-name | +--ro length? uint8 | +--ro pattern field-pattern | +--ro description? field-description +--ro local-data-part-2 +--ro format? local-admin-format +--ro field* [name] +--ro name field-name +--ro length? uint8 +--ro pattern field-pattern +--ro description? field-description 5. YANG Module This section contains the complete YANG module defined in this document. Several elements in this module use data types from [I-D.ietf-netmod-rfc6991-bis]. These data types are represented with the prefix "inet". file "ietf-bgp-communities@2025-06-13.yang" module ietf-bgp-communities { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-bgp-communities"; prefix bgp-comm; import ietf-inet-types { prefix inet; reference "draft-ietf-netmod-rfc6991-bis-18: Common YANG Data Types"; } organization "IETF GROW Working Group"; contact "WG Web: WG List: Author: Martin Pels "; description "This module describes a structure for BGP Communities Pels Expires 28 December 2025 [Page 5] Internet-Draft BGP Community YANG June 2025 Copyright (c) 2025 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 YYYY; 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."; // RFC-EDITOR: please update YYYY with this RFC ID revision 2025-06-13 { description "Initial revision."; reference "RFC YYYY: A YANG Data Model for BGP Communities RFC-EDITOR: please update YYYY with this RFC ID"; } typedef two-octet-as-number { type uint16; description "This type represents autonomous system numbers, which identify an Autonomous System (AS). Autonomous system numbers were originally limited to 16 bits. BGP extensions have enlarged the autonomous system number space to 32 bits. The two-octet-as-number type uses an uint16 base type for use cases where the enlarged number space is not supported."; reference "RFC 1930: Guidelines for creation, selection, and registration of an Autonomous System (AS)"; } typedef community-name { type string { length "1..255"; Pels Expires 28 December 2025 [Page 6] Internet-Draft BGP Community YANG June 2025 pattern '[^\s]+'; } description "This type restricts values for the name of a BGP community."; reference "RFC YYYY: A YANG Data Model for BGP Communities RFC-EDITOR: please update YYYY with this RFC ID"; } typedef community-category { type enumeration { enum informational { value 0; description "Informational community"; } enum action { value 1; description "Action community"; } } description "This type restricts values for the category of a BGP community."; reference "RFC 8195: Use of BGP Large Communities"; } typedef community-description { type string { length "1..65535"; } description "This type restricts values for the description of a BGP community."; reference "RFC YYYY: A YANG Data Model for BGP Communities RFC-EDITOR: please update YYYY with this RFC ID"; } typedef local-admin-format { type enumeration { enum decimal { value 0; description "Decimal number string"; } Pels Expires 28 December 2025 [Page 7] Internet-Draft BGP Community YANG June 2025 enum binary { value 1; description "Bit string"; } } description "This type defines the format options for a BGP community Local Administrator/Local Data field encoding"; reference "RFC YYYY: A YANG Data Model for BGP Communities RFC-EDITOR: please update YYYY with this RFC ID"; } typedef field-name { type string { length "1..255"; pattern '[^\s]+'; } description "This type restricts values for the name leaf of a BGP community Local Administrator/Local Data field."; reference "RFC YYYY: A YANG Data Model for BGP Communities RFC-EDITOR: please update YYYY with this RFC ID"; } typedef field-pattern { type string { length "1..4095"; pattern '[-0-9.,*?^$+|(){}\[\]]+'; } description "This type restricts values for the pattern leaf of a BGP community Local Administrator/Local Data field. Patterns are described as POSIX Extended Regular Expressions"; reference "IEEE 1003.2-1992: Information Technology - Portable Operating System Interface (POSIX) - Part 2: Shell and Utilities (Vol. 1)"; } typedef field-description { type string { length "1..65535"; pattern '(\*)|([^*]+)'; } description Pels Expires 28 December 2025 [Page 8] Internet-Draft BGP Community YANG June 2025 "This type restricts values for the description leaf of a BGP community Local Administrator/Local Data field. The string containing a single asterisk '*' indicates that the value of the field should be used as description."; reference "RFC YYYY: A YANG Data Model for BGP Communities RFC-EDITOR: please update YYYY with this RFC ID"; } grouping local-admin-fields { description "A group of subfields inside the Local Administrator/Local Data section of a BGP Community"; list field { key "name"; ordered-by user; description "Ordered list of fields with their meanings"; leaf name { type field-name; description "The name of the field"; } leaf length { type uint8; description "Length of the field. If local-admin-format is 'decimal', this is a number of digits. In case local-admin-format is 'binary', it is a number of bits. Parsers use the field length to determine how many decimals or bits from the Local Administrator part of the community are used by this field. If this leaf is not defined, the length is assumed to be the maximum allowed length of the entire field list. In this case the field list MUST NOT contain more than one element."; } leaf pattern { type field-pattern; mandatory true; description "Used by parsers to match on the content of the field. This could be a single value or a regular expression pattern matching multiple values."; } leaf description { type field-description; description Pels Expires 28 December 2025 [Page 9] Internet-Draft BGP Community YANG June 2025 "A text description of the field pattern. This description can be used to provide meaning to specific values for a field."; } } } container bgp-communities { config false; description "A community set"; leaf serial { type uint32; must "boolean(.)"; description "Version number of the community set. This value wraps and should be compared using sequence space arithmetic. Publishing implementations are free to decide how to generate this value. One example method is to use the YYYYMMDDnn syntax as commonly used inside the DNS."; reference "RFC 1912: Common DNS Operational and Configuration Errors"; } leaf uri { type inet:uri; description "Publication point for the community set"; } leaf description { type string { length "1..65535"; } description "A description for the community set"; } leaf contact-url { type inet:uri; description "A reference to a webpage with maintainer contact information"; } list contact { key "email-address"; description "A list of contacts for the community set maintainer(s)"; leaf email-address { type inet:email-address; description Pels Expires 28 December 2025 [Page 10] Internet-Draft BGP Community YANG June 2025 "Maintainer contact e-mail address"; } leaf name { type string { length "1..255"; } description "Maintainer contact name"; } leaf role { type string { length "1..255"; } description "Maintainer contact role"; } leaf organization { type string { length "1..255"; } description "Maintainer contact organization"; } leaf organizational-unit { type string { length "1..255"; } description "Maintainer contact organizational unit"; } } list regular { key "name"; ordered-by user; description "A list of objects describing RFC 1997 BGP Communities"; leaf name { type community-name; description "Community name"; } leaf category { type community-category; description "Category of the community"; } leaf description { type community-description; Pels Expires 28 December 2025 [Page 11] Internet-Draft BGP Community YANG June 2025 description "Description for the community"; } leaf global-admin { type two-octet-as-number; mandatory true; description "Global Administrator field"; } container local-admin { description "Local Administrator Field"; leaf format { type local-admin-format; default "decimal"; description "Format used for parsing Local Administrator subfields"; } uses local-admin-fields; } reference "RFC 1997: BGP Communities Attribute"; } list extended { key "name"; ordered-by user; description "A list of objects describing RFC 4360 Extended BGP Communities. Two-Octet and Four-Octet AS Specific communities are supported by this model."; leaf name { type community-name; description "Community name"; } leaf category { type community-category; description "Category of the community"; } leaf description { type community-description; description "Description for the community"; } leaf type { type uint8; mandatory true; Pels Expires 28 December 2025 [Page 12] Internet-Draft BGP Community YANG June 2025 description "High-order Type of the community. Supported values are 0 (0x00) for Transitive Two-Octet AS-Specific Extended Communities, 2 (0x02) for Transitive Four-Octet AS-Specific Extended Communities, 64 (0x40) for Non-Transitive Two-Octet AS-Specific Extended Communities and 66 (0x42) for Non-Transitive Four-Octet AS-Specific Extended Communities."; } leaf subtype { type uint8; mandatory true; description "Low-order Sub-Type of the community"; } choice global-admin { mandatory true; description "Global Administrator Field"; case asn { leaf asn { type two-octet-as-number; must "../type = 0 or ../type = 64"; description "Two-Octet AS"; } } case asn4 { leaf asn4 { type inet:as-number; must "../type = 2 or ../type = 66"; description "Four-Octet AS"; } } } container local-admin { description "Local Administrator Field"; leaf format { type local-admin-format; default "decimal"; description "Format used for parsing Local Administrator subfields"; } uses local-admin-fields; } reference Pels Expires 28 December 2025 [Page 13] Internet-Draft BGP Community YANG June 2025 "RFC 4360: BGP Extended Communities Attribute"; } list large { key "name"; ordered-by user; description "A list of objects describing RFC 8092 Large BGP Communities"; leaf name { type community-name; description "Community name"; } leaf category { type community-category; description "Category of the community"; } leaf description { type community-description; description "Description for the community"; } leaf global-admin { type inet:as-number; mandatory true; description "Global Administrator field"; } container local-data-part-1 { description "Local Data Part 1 Field"; leaf format { type local-admin-format; default "decimal"; description "Format used for parsing Local Data Part 1 subfields"; } uses local-admin-fields; } container local-data-part-2 { description "Local Data Part 2 Field"; leaf format { type local-admin-format; default "decimal"; description "Format used for parsing Local Data Part 2 subfields"; Pels Expires 28 December 2025 [Page 14] Internet-Draft BGP Community YANG June 2025 } uses local-admin-fields; } reference "RFC 8092: BGP Large Communities Attribute"; } } } 6. Operational guidelines 6.1. Publishing guidelines Operators SHOULD only publish BGP community definitions for networks they control. This may include communities where the Global Administrator field contains a private ASN, if this community has a local meaning inside the network of the publisher. When publishing community definitions with overlapping field patterns, these definitions MUST be ordered from most to least preferred. This ensures parsers can perform deterministic matching (see Section 6.2). For example, a definition for a single community "64500:123" needs to be specified before a definition that matches a covering range of communities "64500:*". 6.2. Parsing guidelines A published BGP community definition can be used by parsers to display information about a received community. If a received community matches multiple published community definitions, the first matching definition in the published order takes precedence. Parsers that use published community definitions from multiple operators SHOULD NOT attempt to match received communities where the Global Administrator field contains a private ASN, unless they have some method to determine which published definition is the authoritative one. By default, communities are compared using the decimal representation of the fields. If "format" for a Local Administrator or Local Data Part is set to "binary", the fields in the received community are converted to strings of zeros and ones before comparison. See Section 9.2 for security considerations when parsing community definitions. Pels Expires 28 December 2025 [Page 15] Internet-Draft BGP Community YANG June 2025 7. IANA considerations 7.1. YANG Namespace Registration This document registers the following XML namespace URN in the "IETF XML Registry", following the format defined in [RFC3688]: URI: urn:ietf:params:xml:ns:yang:ietf-bgp-communities Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. 7.2. YANG Module Registration This document registers the following YANG module in the "YANG Module Names" registry [RFC6020]: Name: ietf-bgp-communities Maintained by IANA? N Namespace: urn:ietf:params:xml:ns:yang:ietf-bgp-communities Prefix: bgp-comm Reference: RFC YYYY RFC-EDITOR: please update YYYY with this RFC ID 7.3. YANG SID Allocation This document registers the following entry in the "IETF YANG SID" registry [RFC9595]: SID range entry point: TBD SID range size: 100 YANG module name: ietf-bgp-communities Reference: RFC YYYY RFC-EDITOR: please update YYYY with this RFC ID 8. Implementation status RFC-EDITOR: Please remove this section and the accompanying reference(s) before publication. This section records the status of known implementations of the protocol defined by this specification at the time of posting of this Internet-Draft, and is based on a proposal described in [RFC7942]. The description of implementations in this section is intended to assist the IETF in its decision processes in progressing drafts to RFCs. Please note that the listing of any individual implementation here does not imply endorsement by the IETF. Furthermore, no effort has been spent to verify the information presented here that was supplied by IETF contributors. This is not intended as, and must not Pels Expires 28 December 2025 [Page 16] Internet-Draft BGP Community YANG June 2025 be construed to be, a catalog of available implementations or their features. Readers are advised to note that other implementations may exist. According to [RFC7942], "this will allow reviewers and working groups to assign due consideration to documents that have the benefit of running code, which may serve as evidence of valuable experimentation and feedback that have made the implemented protocols more mature. It is up to the individual working groups to use this information as they see fit". 8.1. Publishing implementations The following networks are known to publish BGP community definitions according to this specification. +========+==========================================+============+ | ASN | Publication URI | YANG model | | | | revision | +========+==========================================+============+ | 197000 | as197000.json (https://www- | 2025-06-13 | | | static.ripe.net/dynamic/draft-ietf-grow- | | | | yang-bgp-communities/as197000.json) | | +--------+------------------------------------------+------------+ | 25152 | as25152.json (https://www- | 2025-06-13 | | | static.ripe.net/dynamic/draft-ietf-grow- | | | | yang-bgp-communities/as25152.json) | | +--------+------------------------------------------+------------+ Table 1: Publishing implementations 8.2. Parser implementations The following known parser implementations exist. +===============================================+============+ | Name | YANG model | | | revision | +===============================================+============+ | NLNOG Looking Glass | 2025-06-13 | | (https://github.com/NLNOG/lg.ring.nlnog.net/) | | +-----------------------------------------------+------------+ Table 2: Parser implementations Pels Expires 28 December 2025 [Page 17] Internet-Draft BGP Community YANG June 2025 9. Security considerations 9.1. Publishing considerations This section is modeled after the template described in Section 3.7 of [I-D.ietf-netmod-rfc8407bis]. The "ietf-bgp-communities" YANG module defines a data model that is designed to be accessed via YANG-based management protocols, such as NETCONF [RFC6241] and RESTCONF [RFC8040]. These YANG-based management protocols (1) have to use a secure transport layer (e.g., SSH [RFC4252], TLS [RFC8446], and QUIC [RFC9000]) and (2) have to use mutual authentication. The Network Configuration Access Control Model (NACM) [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. There are no data nodes defined in this YANG module that are writable/creatable/deletable. Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. Specifically, the following subtrees and data nodes have particular sensitivities/ vulnerabilities: * bgp-communities/contact/email-address * bgp-communities/contact/name Disclosing this information may be misused, e.g., for tracking and data correlation. Publishers MUST NOT populate these elements with Personally Identifiable Information (PII). For example, these elements may be set with information that refers to generic contact information, not pointing to specific individuals. 9.2. Parsing considerations The YANG module described in this document may be used to specify BGP community definitions in different serialization formats, such as XML, JSON or CBOR. Applications that parse these community definitions SHOULD reject objects that do not conform to the YANG model. Furthermore, parsers SHOULD check that the sum of the specified Local Administrator or Local Data Part field lengths in each community definition does not exceed the local part size of the specified community type. For example, a Regular BGP community definition with format "decimal" containing a field of length 4 and a Pels Expires 28 December 2025 [Page 18] Internet-Draft BGP Community YANG June 2025 field of length 2 would be illegal, as the Local Administrator field has a maximum length of 65535 (5 digits). The "bgp-communities/contact-url" element may contain a link to an untrusted webpage. Parsers MAY opt to render the URL as plain text rather than a clickable link, to prevent inadvertent exposure of information by users of the rendered output. Several elements with the "string" data type may be used to display information in a web page or application. Parsers should take care that the appropriate escaping is performed to protect against cross- site scripting attacks. 10. Normative References [I-D.ietf-netmod-rfc6991-bis] Schönwälder, J., "Common YANG Data Types", Work in Progress, Internet-Draft, draft-ietf-netmod-rfc6991-bis- 18, 23 June 2025, . [RFC1930] Hawkinson, J. and T. Bates, "Guidelines for creation, selection, and registration of an Autonomous System (AS)", BCP 6, RFC 1930, DOI 10.17487/RFC1930, March 1996, . [RFC1997] Chandra, R., Traina, P., and T. Li, "BGP Communities Attribute", RFC 1997, DOI 10.17487/RFC1997, August 1996, . [RFC4360] Sangli, S., Tappan, D., and Y. Rekhter, "BGP Extended Communities Attribute", RFC 4360, DOI 10.17487/RFC4360, February 2006, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8092] Heitz, J., Ed., Snijders, J., Ed., Patel, K., Bagdonas, I., and N. Hilliard, "BGP Large Communities Attribute", RFC 8092, DOI 10.17487/RFC8092, February 2017, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . Pels Expires 28 December 2025 [Page 19] Internet-Draft BGP Community YANG June 2025 [RFC9595] Veillette, M., Ed., Pelov, A., Ed., Petrov, I., Ed., Bormann, C., and M. Richardson, "YANG Schema Item iDentifier (YANG SID)", RFC 9595, DOI 10.17487/RFC9595, July 2024, . 11. Informative References [I-D.ietf-netmod-rfc8407bis] Bierman, A., Boucadair, M., and Q. Wu, "Guidelines for Authors and Reviewers of Documents Containing YANG Data Models", Work in Progress, Internet-Draft, draft-ietf- netmod-rfc8407bis-28, 5 June 2025, . [IEEE.1003-2.1992] Institute of Electrical and Electronics Engineers, "Information Technology - Portable Operating System Interface (POSIX) - Part 2: Shell and Utilities (Vol. 1)", IEEE Standard 1003.2, IEEE 1003.2-1992, IEEE ieee-1003-2, 1992. [RFC1912] Barr, D., "Common DNS Operational and Configuration Errors", RFC 1912, DOI 10.17487/RFC1912, February 1996, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC4252] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH) Authentication Protocol", RFC 4252, DOI 10.17487/RFC4252, January 2006, . [RFC4384] Meyer, D., "BGP Communities for Data Collection", BCP 114, RFC 4384, DOI 10.17487/RFC4384, February 2006, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . Pels Expires 28 December 2025 [Page 20] Internet-Draft BGP Community YANG June 2025 [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, . [RFC7942] Sheffer, Y. and A. Farrel, "Improving Awareness of Running Code: The Implementation Status Section", BCP 205, RFC 7942, DOI 10.17487/RFC7942, July 2016, . [RFC7951] Lhotka, L., "JSON Encoding of Data Modeled with YANG", RFC 7951, DOI 10.17487/RFC7951, August 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, . [RFC8195] Snijders, J., Heasley, J., and M. Schmidt, "Use of BGP Large Communities", RFC 8195, DOI 10.17487/RFC8195, June 2017, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . [RFC8792] Watsen, K., Auerswald, E., Farrel, A., and Q. Wu, "Handling Long Lines in Content of Internet-Drafts and RFCs", RFC 8792, DOI 10.17487/RFC8792, June 2020, . [RFC9000] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based Multiplexed and Secure Transport", RFC 9000, DOI 10.17487/RFC9000, May 2021, . Pels Expires 28 December 2025 [Page 21] Internet-Draft BGP Community YANG June 2025 Appendix A. JSON Examples This section shows example use cases for the YANG module defined in this document, using JSON encoding (see [RFC7951]). The examples contain long lines that may be folded, as described in [RFC8792]. A.1. RFC8195 Selective NO_EXPORT definition A JSON definition for the example Large BGP community described in [RFC8195], Section 4.1.1 looks as follows. Pels Expires 28 December 2025 [Page 22] Internet-Draft BGP Community YANG June 2025 =============== NOTE: '\' line wrapping per RFC 8792 ================ { "ietf-bgp-communities:bgp-communities": { "serial": 2023080101, "uri": "http://example.net/peering/communities", "description": "BGP Community example for ASN-Based Selective \ NO_EXPORT", "contact": [ { "email-address": "noc@example.net", "name": "Example.net contact", "role": "Administrative contact", "organization": "Example.net", "organizational-unit": "NOC" } ], "large": [ { "name": "RFC8195-NOEXPORT-ASN", "category": "action", "description": "Do not export route to ASN", "global-admin": 64497, "local-data-part-1": { "field": [ { "name": "Function", "pattern": "4", "description": "ASN-No-Export" } ] }, "local-data-part-2": { "field": [ { "name": "ASN", "pattern": ".*", "description": "*" } ] } } ] } } Pels Expires 28 December 2025 [Page 23] Internet-Draft BGP Community YANG June 2025 A.2. RFC4384 Data Collection definition A JSON definition for the example Regular and Extended BGP communities described in [RFC4384], Section 4 looks as follows. =============== NOTE: '\' line wrapping per RFC 8792 ================ { "ietf-bgp-communities:bgp-communities": { "serial": 2023080101, "uri": "http://example.net/peering/communities", "description": "BGP Community example for Data Collection", "contact-url": "https://example.net/contact", "regular": [ { "name": "RFC4384-REGULAR-ORIGIN-OC/FJ", "description": "A national route over a terrestrial link \ from the Fiji Islands", "global-admin": 10876, "local-admin": { "format": "binary", "field": [ { "name": "Region", "length": 5, "pattern": "00010", "description": "OC" }, { "name": "Satellite", "length": 1, "pattern": "0", "description": "*" }, { "name": "Country", "length": 10, "pattern": "0011110010", "description": "FJ" } ] } } ], "extended": [ { "name": "RFC4384-EXTENDED-ORIGIN-OC/FJ", "description": "A national route over a terrestrial link \ Pels Expires 28 December 2025 [Page 24] Internet-Draft BGP Community YANG June 2025 from the Fiji Islands", "type": 0, "subtype": 8, "asn": 10876, "local-admin": { "format": "binary", "field": [ { "name": "Reserved", "length": 16, "pattern": "0000000000000000" }, { "name": "Region", "length": 5, "pattern": "00010", "description": "OC" }, { "name": "Satellite", "length": 1, "pattern": "0", "description": "*" }, { "name": "Country", "length": 10, "pattern": "0011110010", "description": "FJ" } ] } } ] } } Appendix B. Acknowledgements The author would like to thank Jeffrey Haas, Luuk Hendriks, Jasper den Hertog, Teun Vink, Tom Petch, Dale Carder, Mohamed Boucadair and Ladislav Lhotka for contributing ideas and feedback to this document. Author's Address Martin Pels RIPE NCC Netherlands Pels Expires 28 December 2025 [Page 25] Internet-Draft BGP Community YANG June 2025 Email: mpels@ripe.net Pels Expires 28 December 2025 [Page 26]