Network Working Group H. Chen Internet-Draft D. Eastlake Intended status: Standards Track Independent Expires: 28 March 2025 A. Wang China Telecom G. Mishra Verizon Inc. Y. Liu China Mobile Y. Fan Casa Systems L. Liu Fujitsu X. Liu Alef Edge 24 September 2024 IGP Extensions for Advertising Node Index draft-chen-lsr-adv-ni-05 Abstract This document describes OSPF and IS-IS extensions for distributing the node index configured on a node. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 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." Chen, et al. Expires 28 March 2025 [Page 1] Internet-Draft Advertise Node Ix September 2024 This Internet-Draft will expire on 28 March 2025. Copyright Notice Copyright (c) 2024 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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 2 2. Extensions to OSPF . . . . . . . . . . . . . . . . . . . . . 3 3. Extension to IS-IS . . . . . . . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . 4 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 5.1. OSPF RI TLVs Registry . . . . . . . . . . . . . . . . . . 4 5.2. IS-IS Sub-TLVs for TLV 242 Registry . . . . . . . . . . . 4 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5 7. Normative References . . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction When the nodes in a network are numbered or indexed from 1 to the number of the nodes, an efficient stateless multicast along the shortest paths to the egresses of a P2MP tree can be achieved using the node indices of the egresses. This document proposes OSPF and IS-IS extensions for distributing the node index configured on a node to support the best effort stateless multicast. When a controller such as PCE as a controller has the node indexes, it can send the P2MP tree encoded in the node indexes to the ingress of the tree. 1.1. Terminology LSA: Link State Advertisement. OSPF: Open Shortest Path First. Chen, et al. Expires 28 March 2025 [Page 2] Internet-Draft Advertise Node Ix September 2024 LSP: Link State Protocol data unit. IS-IS: Intermediate System to Intermediate System. 2. Extensions to OSPF This section describes extensions to OSPF for distributing the node index configured on a node. The node index of a node MUST be unique in a network. This is like the identifier (ID) of the node. [RFC7770] defines the Router Information (RI) Link state Advertisement (LSA). The RI LSA is used to advertise Optional Router Information using Router Information LSA TLVs. A new Router Information LSA TLV, called Node Index TLV, is defined to carry the Node Index configured on the node originating the RI LSA. The Node Index TLV has the following format: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type (TBD1) | Length (2) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Node Index | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: Node Index TLV Type: TBD1. Length: 2. Node Index: The node index configured on a node. This TLV is optional. It is applicable to both OSPFv2 and OSPFv3. For advertising a node index, the area-scoped RI LSA including a Node Index TLV is used. 3. Extension to IS-IS This section describes an extension to IS-IS for distributing the Node Index configured on a node. [RFC7981] defines the IS-IS Router CAPABILITY TLV to advertise Router Information. The TLV includes multiple sub-TLVs. A new Node Index sub-TLV to be included in the TLV, is defined to carry the Node Index configured on the node originating the TLV in its LSP. This sub-TLV has the following format: Chen, et al. Expires 28 March 2025 [Page 3] Internet-Draft Advertise Node Ix September 2024 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type (TBD2) | Length (2) | Node Index | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 2: Node Index sub-TLV Type: TBD2. Length: 2. Node Index: The Node Index configured on a node. This sub-TLV is optional. For advertising a node index, the area- scoped LSP including a Node Index sub-TLV in an IS-IS Router CAPABILITY TLV is used. 4. Security Considerations TBD. 5. IANA Considerations 5.1. OSPF RI TLVs Registry Under "OSPF Router Information (RI) TLVs registry" as defined in [RFC7770], IANA is requested to assign a new type as follows: +==============+===================+=====================+ | Value | Description | reference | +==============+===================+=====================+ | TBD1 | Node Index | This document | +--------------+-------------------+---------------------+ 5.2. IS-IS Sub-TLVs for TLV 242 Registry Under "Sub-TLVs for TLV 242 (IS-IS Router CAPABILITY TLV) registry" as defined in [RFC7981], IANA is requested to assign a new sub-TLV as follows: +==============+===================+=====================+ | Value | Description | reference | +==============+===================+=====================+ | TBD2 | Node Index | This document | +--------------+-------------------+---------------------+ Chen, et al. Expires 28 March 2025 [Page 4] Internet-Draft Advertise Node Ix September 2024 6. Acknowledgements The authors would like to thank people for their comments on this work. 7. 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, . [RFC7770] Lindem, A., Ed., Shen, N., Vasseur, JP., Aggarwal, R., and S. Shaffer, "Extensions to OSPF for Advertising Optional Router Capabilities", RFC 7770, DOI 10.17487/RFC7770, February 2016, . [RFC7981] Ginsberg, L., Previdi, S., and M. Chen, "IS-IS Extensions for Advertising Router Information", RFC 7981, DOI 10.17487/RFC7981, October 2016, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . Authors' Addresses Huaimo Chen Independent Boston, MA, United States of America Email: hchen.ietf@gmail.com Donald E. Eastlake 3rd Independent 2386 Panoramic Circle Apopka, FL, 32703 United States of America Phone: +1-508-333-2270 Email: d3e3e3@gmail.com Chen, et al. Expires 28 March 2025 [Page 5] Internet-Draft Advertise Node Ix September 2024 Aijun Wang China Telecom Beiqijia Town, Changping District Beijing 102209 China Email: wangaj3@chinatelecom.cn Gyan S. Mishra Verizon Inc. 13101 Columbia Pike Silver Spring, MD 20904 United States of America Phone: 301 502-1347 Email: gyan.s.mishra@verizon.com Yisong Liu China Mobile Email: liuyisong@chinamobile.com Yanhe Fan Casa Systems United States of America Email: yfan@casa-systems.com Lei Liu Fujitsu United States of America Email: liulei.kddi@gmail.com Xufeng Liu Alef Edge United States of America Email: xufeng.liu.ietf@gmail.com Chen, et al. Expires 28 March 2025 [Page 6]