DETNET Q. Xiong Internet-Draft ZTE Corporation Intended status: Standards Track D. Yang Expires: 11 September 2023 Beijing Jiaotong University 10 March 2023 Data Fields for DetNet Enhanced Data Plane draft-xiong-detnet-data-fields-edp-00 Abstract This document discusses the specific metadata which should be carried in Enhanced Data plane (EDP), proposes the DetNet data fields and option types for EDP such as Deterministic Latency Action Option. DetNet Data-Fields for EDP can be encapsulated into a variety of protocols such as MPLS, IPv6 and SRv6 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/. 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Xiong & Yang Expires 11 September 2023 [Page 1] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions used in this document . . . . . . . . . . . . . . 3 2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3 3. Specific Metadata for DetNet Enhanced Data Plane . . . . . . 3 3.1. Queuing-based Metadata . . . . . . . . . . . . . . . . . 3 4. Data Fields for DetNet Enhanced Data Plane . . . . . . . . . 4 4.1. DetNet Option-Types and Data-Fields . . . . . . . . . . . 4 4.2. DetNet Deterministic Latency Action Option . . . . . . . 5 4.2.1. DetNet DLA Option Header . . . . . . . . . . . . . . 5 4.2.1.1. DetNet DLA Behaviour Type . . . . . . . . . . . . 6 4.2.1.2. DetNet DLA Queuing Type . . . . . . . . . . . . . 6 4.2.2. DetNet DLA Option Data . . . . . . . . . . . . . . . 7 4.2.2.1. Cycle Queuing Data . . . . . . . . . . . . . . . 8 4.2.2.2. Deadline Queuing Data . . . . . . . . . . . . . . 8 4.2.2.3. Local Deadline Queuing Data . . . . . . . . . . . 9 4.2.2.4. Timeslot Queuing Data . . . . . . . . . . . . . . 9 5. Encapsulation Considerations for DetNet Enhanced Data Plane . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.1. Metadata for DetNet Enhanced Data Plane . . . . . . . . . 10 5.2. Encoding for DetNet Enhanced Data Plane . . . . . . . . . 10 6. Security Considerations . . . . . . . . . . . . . . . . . . . 10 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11 9. Normative References . . . . . . . . . . . . . . . . . . . . 11 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13 1. Introduction According to [RFC8655], Deterministic Networking (DetNet) operates at the IP layer and delivers service which provides extremely low data loss rates and bounded latency within a network domain. DetNet data planes has been specified in [RFC8938]. The existing deterministic technologies are facing large-scale number of nodes and long-distance transmission, traffic scheduling, dynamic flows, and other controversial issues in large-scale networks. The DetNet Enhanced Data plane (EDP) is required to support a data plane method of flow identification and packet treatment. [I-D.ietf-detnet-scaling-requirements]has described the enhancement requirements for DetNet enhanced data plane, such as aggregated flow identification, redundancy, explicit path selection and deterministic latency guarantees. [I-D.xiong-detnet-large-scale-enhancements] has proposed the overall framework of DetNet enhancements for large-scale deterministic networks. The packet treatment should schedule the resources and indicate the behaviour to ensure the deterministic latency. Moreover, new functions and related metadata should be Xiong & Yang Expires 11 September 2023 [Page 2] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 supported in enhanced DetNet. This document discusses the specific metadata which should be carried in Enhanced Data plane (EDP), proposes the DetNet data fields and option types for EDP such as Deterministic Latency Action Option. DetNet Data-Fields for EDP can be encapsulated into a variety of protocols such as MPLS, IPv6 and SRv6 networks. 2. Conventions used in this document 2.1. Terminology The terminology is defined as [RFC8655], [RFC8938] and [I-D.ietf-detnet-scaling-requirements]. 2.2. 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. Abbreviations and definitions used in this document: EDP: Enhanced Data plane SRH: Segment Routing Header SRv6: Segment Routing for IPv6 forwarding plane DLA: Deterministic Latency Action 3. Specific Metadata for DetNet Enhanced Data Plane 3.1. Queuing-based Metadata The queuing-based mechanisms is an important type of resource to ensure the deterministic latency. As described in [RFC9320], the end-to-end bounded latency depends on the value of queuing delay bound along with the queuing mechanisms. Multiple queuing mechanisms can be used to guarantee the bounded latency in DetNet. And many types of queuing mechanisms have been proposed to provide diversified deterministic service for various applications. For example, time-scheduling queuing mechanisms includes the TAS (Time Aware Shaping) [IIEEE802.1Qbv] and priority-scheduling includes the CBS (Credit-Based Shaper)[IEEE802.1Q-2014] with ATS (Asynchronous Xiong & Yang Expires 11 September 2023 [Page 3] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 Traffic Shaping)[IEEE802.1Qcr]. The cyclic-scheduling queuing mechanism has been proposed such as CQF (Cyclic Queuing and Forwarding) in [IEEE802.1Qch] and improved in [I-D.dang-queuing-with-multiple-cyclic-buffers]. The deadline- scheduling queuing mechanism has been proposed in [I-D.stein-srtsn] and improved in [I-D.peng-detnet-deadline-based-forwarding]. The per-flow queuing mechanism includes Guaranteed-Service Integrated service (IntServ) [RFC2212]. The asynchronous queuing mechanism includes the Asynchronous Deterministic Networking (ADN) as per [I-D.joung-detnet-asynch-detnet-framework]. The Packet Timeslot Mechanism is also proposed as per [I-D.peng-detnet-packet-timeslot-mechanism]. The functions such as the queuing mechanisms should be provided for enhanced DetNet to ensure the deterministic latency. And when queuing mechanisms used in large-scale networks, some queuing parameters should be carried for coordination between nodes so as to make appropriate packet forwarding and scheduling decisions to meet the time bounds. The DetNet forwarding nodes along the path can apply the function and the deterministic latency related information should be carried as metadata in the packet to achieve the end-to-end bounded latency. 4. Data Fields for DetNet Enhanced Data Plane 4.1. DetNet Option-Types and Data-Fields The enhanced functions and related metadata for DetNet EDP should be confirmed before the encapsulations. While more than one metadata should be carried in EDP, the common DetNet Header for EDP should be considered to cover all option-types and data. 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DetNet-Type | DetNet-Length | RESERVED | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | | ~ DetNet Option and Data Space ~ | | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: DetNet Header for EDP Xiong & Yang Expires 11 September 2023 [Page 4] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 DetNet-Type: 8-bit unsigned integer, defining the DetNet Option-type for EDP. This document defines an Option: Deterministic Latency Action Option as defined in section 4.2. DetNet-Length: 8-bit unsigned integer, defined the Length of the DetNet Header for EDP in 4-octet units. 4.2. DetNet Deterministic Latency Action Option The DetNet Deterministic Latency Action (DLA) Option carries data that is added by the DetNet encapsulating node and interpreted by the decapsulating node. The DetNet transit nodes MAY process the data by forwarding the option data determined by option type and may modify it. The DetNet DLA Option consist of a fixed-size "DetNet DLA Option Header" and a variable-size "DetNet DLA Option Data". The Header and Data may be encapsulated continuously or separately. A Data or more than one Data in lists can be carried in packets. 4.2.1. DetNet DLA Option Header DetNet Deterministic Latency Action (DLA) Option header: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DLA Type | Data Len | Ancillary Len | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 2: DLA Option header DLA(Deterministic Latency Action) Type(16 bits): indicates the type of deterministic latency actions for DetNet metadata. The DLA Type can be divided into two parts including behaviour action type and function/queuing type. The format is 16 bits such as 0xFFFF. The DLA Type field is designed as follow: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DLA B-type | DLA Q-type | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Xiong & Yang Expires 11 September 2023 [Page 5] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 Figure 3: DLA Type 4.2.1.1. DetNet DLA Behaviour Type DLA B-type(8 bits): indicates the behaviour action type of packet treatment ensuring the deterministic latency as following shown. +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Behaviour Action | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0000 | Unassigned | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0100 | Bandwidth guarantee | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0200 | Jitter guarantee | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0300 | Delay guarantee | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0400 | Low delay and jitter guarantee | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0500 |Ultra-low delay and jitter guarantee | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 4: Behaviour Type (B-type) 4.2.1.2. DetNet DLA Queuing Type DLA Q-type(8 bits): indicates the type of queuing-based mechanisms or functions ensuring the deterministic latency and related metadata. For example, the functions such as a particular queuing mechanism may be indicated and related parameters should be provided as section 3.1.2 shown. Xiong & Yang Expires 11 September 2023 [Page 6] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |Sub-type| Queuing/Function Action | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0000 | Unassigned | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0001 | Cycle Information | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0002 | Deadline Information | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0003 | Local Deadline Information | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0x0004 | Time Slot Information | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 5: Queuing/Function Action Sub-type Data Len: 8-bit unsigned integer. Length of DLA option data, in octets. Ancillary Len: 8-bit unsigned integer. Length of DLA ancillary data, in octets. The types of Deterministic Latency functions should cover all the mechanisms ensuring the Deterministic Latency such as the existing queuing and scheduling mechanisms and other mechanisms which may be proposed in the future. 4.2.2. DetNet DLA Option Data DetNet Deterministic Latency Action option data MUST be aligned by 4 octets: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DLA option data field determined by DLA Q-Type (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | DLA ancillary data field determined by DLA Type (variable)| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Xiong & Yang Expires 11 September 2023 [Page 7] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 Figure 6: DLA Option Data Field DLA option data: Variable-length field. It provides function-based or queuing-based information for a node to forward a DetNet flow. The data of which is determined by the DLA Q-type. The examples of different types of queuing-based data is as following sections shown. DLA ancillary data: Variable-length field. It provides additional information for a node to forward a DetNet flow. The data of which is determined by the DLA type. The DetNet option data and Ancillary data can be provided one time or in list. 4.2.2.1. Cycle Queuing Data When the Sub-type is set to 0x0001, indicates the Multiple Cyclic Queuing mechanism as defined in [I-D.dang-queuing-with-multiple-cyclic-buffers]. The Cycle Queuing Data may be carried and designed as following shown: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Cycle Profile ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Cycle ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 7: Cycle Queuing Data Cycle Profile ID (32bits): indicates the profile ID which the cyclic queue applied at a node. Cycle ID (32bits): indicates the Cycle ID for a node to forward a DetNet flow. 4.2.2.2. Deadline Queuing Data When the Sub-type is set to 0x0002, indicates the deadline mechanisms as defined in [I-D.peng-detnet-deadline-based-forwarding]. The Deadline Queuing Data may be carried and designed as follow: Xiong & Yang Expires 11 September 2023 [Page 8] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags |M|D| Planned Deadline | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Accumulated Planned Deadline / Accumulated Deadline Deviation | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Accumulated Actual Residence Time / Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 8: Deadline Queuing Data Planned and deadline Deviation has been provided as defined in [I-D.peng-6man-deadline-option]. 4.2.2.3. Local Deadline Queuing Data When the Sub-type is set to 0x0003, indicates the local deadline mechanisms as defined in [I-D.stein-srtsn]. The Local Deadline Queuing Data may be carried and designed as follow: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Local Deadline | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 9: Local Deadline Queuing Data Local Deadline: indicates the local deadline as defined in [I-D.stein-srtsn]. 4.2.2.4. Timeslot Queuing Data When the Sub-type is set to 0x0004, indicates the local deadline mechanisms as defined in [I-D.peng-detnet-packet-timeslot-mechanism]. The time-slot information may be carried and designed as follow: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Timeslot ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Xiong & Yang Expires 11 September 2023 [Page 9] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 Figure 10: Timeslot Queuing Data Timeslot ID: indicates the identifier of the timeslot as defined in [I-D.peng-detnet-packet-timeslot-mechanism]. 5. Encapsulation Considerations for DetNet Enhanced Data Plane 5.1. Metadata for DetNet Enhanced Data Plane For the functions ensuring the deterministic latency such as queuing mechanisms should be provided and the queuing related information should be carried as metadata. The metadata and definitions should be common among different candidate queuing solutions. Information and metadata MUST be simplified and limited to be carried in DetNet packets for provided bounded latency related scheduling along the forwarding path. The requirement of the flow or service may be not suitable to be carried explicitly in DetNet data plane. The packet treatment should schedule the resources and indicate the behaviour to ensure the deterministic latency in forwarding sub-layer. So the queuing mechanisms could be viewed as a type of deterministic resources. The resources type and queuing type should be explicitly indicated. 5.2. Encoding for DetNet Enhanced Data Plane For IPv4 and traditional MPLS networks, it is not suitable to carry new metadata and it is suggested to reuse the original bits such as DSCP [I-D.eckert-detnet-tcqf]. The mapping from DSCP and the metadata such as queuing information MUST be provided in the controller plane. The DetNet-specific metadata can also be encoded as a common data fields and the definition of data fields is independent from the encapsulating protocols. The data fields could be encapsulated into a variety of protocols, such as MPLS 2.0 [I-D.sx-detnet-mpls-queue], IPv6 [I-D.xiong-detnet-6man-queuing-option], SRv6 [draft-xiong- detnet-spring-srh-extensions] and so on. 6. Security Considerations TBA Xiong & Yang Expires 11 September 2023 [Page 10] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 7. IANA Considerations TBA 8. Acknowledgements TBA 9. Normative References [I-D.dang-queuing-with-multiple-cyclic-buffers] Liu, B. and J. Dang, "A Queuing Mechanism with Multiple Cyclic Buffers", Work in Progress, Internet-Draft, draft- dang-queuing-with-multiple-cyclic-buffers-00, 22 February 2021, . [I-D.eckert-detnet-tcqf] Eckert, T. T., Bryant, S., Malis, A. G., and G. Li, "Deterministic Networking (DetNet) Data Plane - Tagged Cyclic Queuing and Forwarding (TCQF) for bounded latency with low jitter in large scale DetNets", Work in Progress, Internet-Draft, draft-eckert-detnet-tcqf-01, 6 November 2022, . [I-D.ietf-detnet-scaling-requirements] Liu, P., Li, Y., Eckert, T. T., Xiong, Q., Ryoo, J., zhushiyin, and X. Geng, "Requirements for Scaling Deterministic Networks", Work in Progress, Internet-Draft, draft-ietf-detnet-scaling-requirements-01, 1 March 2023, . [I-D.joung-detnet-asynch-detnet-framework] Joung, J., Ryoo, J., Cheung, T., Li, Y., and P. Liu, "Asynchronous Deterministic Networking Framework for Large-Scale Networks", Work in Progress, Internet-Draft, draft-joung-detnet-asynch-detnet-framework-01, 24 October 2022, . [I-D.peng-6man-deadline-option] Peng, S., Tan, B., and P. Liu, "Deadline Option", Work in Progress, Internet-Draft, draft-peng-6man-deadline-option- 01, 11 July 2022, . Xiong & Yang Expires 11 September 2023 [Page 11] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 [I-D.peng-detnet-deadline-based-forwarding] Peng, S., Tan, B., and P. Liu, "Deadline Based Deterministic Forwarding", Work in Progress, Internet- Draft, draft-peng-detnet-deadline-based-forwarding-04, 8 December 2022, . [I-D.peng-detnet-packet-timeslot-mechanism] Peng, S., Tan, B., and P. Liu, "Generic Packet Timeslot Mechanism", Work in Progress, Internet-Draft, draft-peng- detnet-packet-timeslot-mechanism-00, 9 February 2023, . [I-D.stein-srtsn] Stein, Y. J., "Segment Routed Time Sensitive Networking", Work in Progress, Internet-Draft, draft-stein-srtsn-01, 29 August 2021, . [I-D.sx-detnet-mpls-queue] Song, X. and Q. Xiong, "MPLS Sub-Stack Encapsulation for Deterministic Latency Action", Work in Progress, Internet- Draft, draft-sx-detnet-mpls-queue-03, 6 November 2022, . [I-D.xiong-detnet-6man-queuing-option] Xiong, Q. and J. Zhao, "DetNet Deterministic Latency Option for IPv6", Work in Progress, Internet-Draft, draft- xiong-detnet-6man-queuing-option-03, 5 January 2023, . [I-D.xiong-detnet-large-scale-enhancements] Xiong, Q., Du, Z., Zhao, J., and D. Yang, "DetNet Data Plane Enhancements for Large-Scale Deterministic Networks", Work in Progress, Internet-Draft, draft-xiong- detnet-large-scale-enhancements-01, 24 October 2022, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Xiong & Yang Expires 11 September 2023 [Page 12] Internet-Draft Data Fields for DetNet Enhanced Data Pla March 2023 [RFC2212] Shenker, S., Partridge, C., and R. Guerin, "Specification of Guaranteed Quality of Service", RFC 2212, DOI 10.17487/RFC2212, September 1997, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8655] Finn, N., Thubert, P., Varga, B., and J. Farkas, "Deterministic Networking Architecture", RFC 8655, DOI 10.17487/RFC8655, October 2019, . [RFC8938] Varga, B., Ed., Farkas, J., Berger, L., Malis, A., and S. Bryant, "Deterministic Networking (DetNet) Data Plane Framework", RFC 8938, DOI 10.17487/RFC8938, November 2020, . [RFC9320] Finn, N., Le Boudec, J.-Y., Mohammadpour, E., Zhang, J., and B. Varga, "Deterministic Networking (DetNet) Bounded Latency", RFC 9320, DOI 10.17487/RFC9320, November 2022, . Authors' Addresses Quan Xiong ZTE Corporation No.6 Huashi Park Rd Wuhan Hubei, 430223 China Email: xiong.quan@zte.com.cn Dong Yang Beijing Jiaotong University Beijing China Email: dyang@bjtu.edu.cn Xiong & Yang Expires 11 September 2023 [Page 13]