MPLS H. Song Internet-Draft Futurewei Technologies Intended status: Standards Track G. Fioccola Expires: 27 February 2025 Huawei Technologies R. Gandhi Cisco Systems 26 August 2024 Flag-based MPLS Network Actions for On-Path Telemetry draft-song-mpls-flag-based-opt-04 Abstract This document describes the scheme to support two on-path telemetry techniques, PBT-M and Alternate Marking, as flag-based MPLS Network Actions for OAM in MPLS networks. 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 27 February 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. Song, et al. Expires 27 February 2025 [Page 1] Internet-Draft MPLS OPT August 2024 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. PBT-M Action . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Alternate Marking Action . . . . . . . . . . . . . . . . . . 3 4. Action Encoding . . . . . . . . . . . . . . . . . . . . . . . 3 5. Security Considerations . . . . . . . . . . . . . . . . . . . 4 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 8.1. Normative References . . . . . . . . . . . . . . . . . . 4 8.2. Informative References . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction On-path telemetry, as described in [I-D.song-opsawg-ifit-framework], is a kind of hybrid type I network OAM [RFC7799] which directly measure and monitor the user packets. Some on-path telemetry technique incur very little overhead but offer big benefits on network performance monitoring and troubleshooting. PBT-M [I-D.song-ippm-postcard-based-telemetry] (Postcard-Based On-Path Telemetry using Packet Marking) is such on-path telemetry technique which uses only a single flag bit to trigger the collection of the telemetry data regarding the packet. Alternate Marking Method [RFC9341] is another on-path performance measurement method which uses only two flag bits to measure packet loss, delay, and jitter for live data traffic. In MPLS networks, MPLS Network Action (MNA) [I-D.ietf-mpls-mna-fwk] extends the MPLS label stack by supporting extra network actions encoded both in stack and post stack. The MNA header encoding is described in [I-D.ietf-mpls-mna-hdr]. This document describe the scheme to use flag-based MNAs to support PBT-M and Alternate Marking Method (AMM). 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. Song, et al. Expires 27 February 2025 [Page 2] Internet-Draft MPLS OPT August 2024 2. PBT-M Action A flag bit (TBA1) in the flag-based network action field is used as the PBT-M indicator. If the bit is set to '1', a configured node is triggered to collect and export the telemetry data as configured by the control plane. The detailed method on node configuration, data export and correlation are recommended in [I-D.song-ippm-postcard-based-telemetry]. 3. Alternate Marking Action Two flag bits (TBA2) in the flag-based network action field are used to support the alternate marking method as described in [RFC9341]. 4. Action Encoding The proposed action encoding is shown in Figure 1 adapted from [I-D.ietf-mpls-mna-hdr]. In the figure, 'P' stands for PBT-M flag and 'AM' stands for alternate marking flags. 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | NASI=bSPL | TC |S| TTL | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |NAI-Opcode=2 |P|AM | |0|IHS|S| Res |U| NASL | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ (TBA) Figure 1: Action Encoding The scope of the Network Action is carried in the IHS field for Ingress-To-Egress (I2E), Hop-By-Hop (HBH) or Select. Network Sub Stack Length is set to number of LSEs following this network action LSE which is 0 in this example. No Post Stack Network Action is required for this. Note that the in-stack MNA encoding may take different form, and these flag-based on-path telemetry use cases would adapt to it. Song, et al. Expires 27 February 2025 [Page 3] Internet-Draft MPLS OPT August 2024 5. Security Considerations Only the ingress edge node is allowed to set/reset these flag bits. The other on-path nodes can only react to the bit values. The tampering of these flag-based actions would result in DoS attack or unreliable measurements. Therefore, security measures must be taken to ensure the proper functioning of these actions. 6. IANA Considerations This document requires IANA allocation a bit for PBT-M action (TBA1) and two bits for Alternate Marking (TBA2) from the MPLS "In-Stack MPLS Network Action Indicator Flags" registry created in [I-D.ietf-mpls-mna-hdr]. 7. Acknowledgments 8. References 8.1. Normative References [I-D.ietf-mpls-mna-hdr] Rajamanickam, J., Gandhi, R., Zigler, R., Song, H., and K. Kompella, "MPLS Network Action (MNA) Sub-Stack Solution", Work in Progress, Internet-Draft, draft-ietf-mpls-mna-hdr- 07, 17 June 2024, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC7799] Morton, A., "Active and Passive Metrics and Methods (with Hybrid Types In-Between)", RFC 7799, DOI 10.17487/RFC7799, May 2016, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . 8.2. Informative References Song, et al. Expires 27 February 2025 [Page 4] Internet-Draft MPLS OPT August 2024 [I-D.ietf-mpls-miad-mna-requirements] Bocci, M. and S. Bryant, "Requirements for MPLS Network Action Indicators and MPLS Ancillary Data", Work in Progress, Internet-Draft, draft-ietf-mpls-miad-mna- requirements-00, 5 May 2022, . [I-D.ietf-mpls-mna-fwk] Andersson, L., Bryant, S., Bocci, M., and T. Li, "MPLS Network Actions (MNA) Framework", Work in Progress, Internet-Draft, draft-ietf-mpls-mna-fwk-10, 6 August 2024, . [I-D.song-ippm-postcard-based-telemetry] Song, H., Mirsky, G., Zhou, T., Li, Z., Graf, T., Mishra, G. S., Shin, J., and K. Lee, "On-Path Telemetry using Packet Marking to Trigger Dedicated OAM Packets", Work in Progress, Internet-Draft, draft-song-ippm-postcard-based- telemetry-16, 2 June 2023, . [I-D.song-opsawg-ifit-framework] Song, H., Qin, F., Chen, H., Jin, J., and J. Shin, "Framework for In-situ Flow Information Telemetry", Work in Progress, Internet-Draft, draft-song-opsawg-ifit- framework-21, 23 October 2023, . [RFC9341] Fioccola, G., Ed., Cociglio, M., Mirsky, G., Mizrahi, T., and T. Zhou, "Alternate-Marking Method", RFC 9341, DOI 10.17487/RFC9341, December 2022, . Authors' Addresses Haoyu Song Futurewei Technologies United States of America Email: haoyu.song@futurewei.com Giuseppe Fioccola Huawei Technologies Germany Song, et al. Expires 27 February 2025 [Page 5] Internet-Draft MPLS OPT August 2024 Email: giuseppe.fioccola@huawei.com Rakesh Gandhi Cisco Systems Canada Email: rgandhi@cisco.com Song, et al. Expires 27 February 2025 [Page 6]