IPPM T. Zhou, Ed. Internet-Draft Huawei Intended status: Standards Track J. Guichard Expires: 31 August 2023 Futurewei F. Brockners S. Raghavan Cisco Systems 27 February 2023 A YANG Data Model for In-Situ OAM draft-ietf-ippm-ioam-yang-06 Abstract In situ Operations, Administration, and Maintenance (IOAM) collects operational and telemetry information in the packet while the packet traverses a path between two points in the network. RFC9197 discusses the data fields and associated data types for IOAM. This document defines a YANG module for the IOAM function. 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 31 August 2023. Copyright Notice Copyright (c) 2023 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 Zhou, Ed., et al. Expires 31 August 2023 [Page 1] Internet-Draft YANG Model for IOAM February 2023 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 2. Conventions used in this document . . . . . . . . . . . . . . 3 2.1. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 3. Design of the IOAM YANG Data Model . . . . . . . . . . . . . 3 3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2. Preallocated Tracing Profile . . . . . . . . . . . . . . 5 3.3. Incremental Tracing Profile . . . . . . . . . . . . . . . 5 3.4. Proof of Transit Profile . . . . . . . . . . . . . . . . 6 3.5. Edge-to-Edge Profile . . . . . . . . . . . . . . . . . . 6 4. IOAM YANG Module . . . . . . . . . . . . . . . . . . . . . . 7 5. Security Considerations . . . . . . . . . . . . . . . . . . . 20 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 21 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 22 8. Normative References . . . . . . . . . . . . . . . . . . . . 22 Appendix A. An Example of Incremental Tracing Profile . . . . . 23 Appendix B. An Example of Pre-allocated Tracing Profile . . . . 24 Appendix C. An Example of Prove of Transit Profile . . . . . . . 25 Appendix D. An Example of Edge-to-Edge Profile . . . . . . . . . 26 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27 1. Introduction In situ Operations, Administration, and Maintenance (IOAM) collects operational and telemetry information in the packet while the packet traverses a path between two points in the network. The data types and data formats for IOAM data records have been defined in [RFC9197]. The IOAM data can be embedded in many protocol encapsulations such as Network Services Header (NSH) and IPv6. This document defines a data model for IOAM capabilities using the YANG data modeling language [RFC7950]. This YANG model supports four IOAM options, which are: * Incremental Tracing Option [RFC9197] * Pre-allocated Tracing Option [RFC9197] * Proof of Transit (PoT) Option [RFC9197] * Edge-to-Edge Option [RFC9197] Zhou, Ed., et al. Expires 31 August 2023 [Page 2] Internet-Draft YANG Model for IOAM February 2023 2. Conventions used in this document The keywords "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 BCP14, [RFC2119], [RFC8174] when, and only when, they appear in all capitals, as shown here. The following terms are defined in [RFC7950] and are used in this specification: * augment * data model * data node The terminology for describing YANG data models is found in [RFC7950]. 2.1. Tree Diagrams Tree diagrams used in this document follow the notation defined in [RFC8340]. 3. Design of the IOAM YANG Data Model 3.1. Overview The IOAM model is organized as list of profiles as shown in the following figure. Each profile associates with one flow and the corresponding IOAM information. The "ioam-info" is a container for all the read only information that assists monitoring systems in the interpretation of the IOAM data. Zhou, Ed., et al. Expires 31 August 2023 [Page 3] Internet-Draft YANG Model for IOAM February 2023 module: ietf-ioam +--rw ioam +--ro ioam-info | +--ro timestamp-type? identityref | +--ro available-interface* [if-name] | +--ro if-name if:interface-ref +--rw ioam-profiles +--rw admin-config | +--rw enabled? boolean +--rw ioam-profile* [profile-name] +--rw profile-name string +--rw filter | +--rw filter-type? ioam-filter-type | +--rw ace-name? -> /acl:acls/acl/aces/ace/name +--rw protocol-type? ioam-protocol-type +--rw incremental-tracing-profile {incremental-trace}? | ... +--rw preallocated-tracing-profile {preallocated-trace}? | ... +--rw pot-profile {proof-of-transit}? | ... +--rw e2e-profile {edge-to-edge}? ... In the "ioam-profiles", the "enabled" is an administrative configuration. When it is set to true, IOAM configuration is enabled for the system. Meanwhile, the IOAM data-plane functionality is enabled. The "filter" is used to identify a flow, where the IOAM profile can apply. There may be multiple filter types. ACL [RFC8519] is a common way to specify a flow. Each IOAM profile can associate with an ACE(Access Control Entry). IOAM actions MUST be driven by the accepted packets, when the matched ACE "forwarding" action is "accept". The IOAM data can be encapsulated into multiple protocols, e.g., IPv6 [I-D.ietf-ippm-ioam-ipv6-options] and NSH [I-D.ietf-sfc-ioam-nsh]. The "protocol-type" is used to indicate where the IOAM is applied. For example, if the "protocol-type" is IPv6, the IOAM ingress node will encapsulate the associated flow with the IPv6-IOAM [I-D.ietf-ippm-ioam-ipv6-options] format. In this document, IOAM data includes four encapsulation types, i.e., incremental tracing data, preallocated tracing data, proof of transit data and end to end data. In practice, multiple IOAM data types can be encapsulated into the same IOAM header. The "ioam-profile" contains a set of sub-profiles, each of which relates to one Zhou, Ed., et al. Expires 31 August 2023 [Page 4] Internet-Draft YANG Model for IOAM February 2023 encapsulation type. The configured object may not support all the sub-profiles. The supported sub-profiles are indicated by 4 defined features, i.e., "incremental-trace", "preallocated-trace", "proof-of- transit" and "edge-to-edge". 3.2. Preallocated Tracing Profile The IOAM tracing data is expected to be collected at every node that a packet traverses to ensure visibility into the entire path a packet takes within an IOAM domain. The preallocated tracing option will create pre-allocated space for each node to populate its information . The "preallocated-tracing-profile" contains the detailed information for the preallocated tracing data. The information includes: * enabled: indicates whether the preallocated tracing profile is enabled. * node-action: indicates the operation (e.g., encapsulate IOAM header, transit the IOAM data, or decapsulate IOAM header) applied to the dedicated flow. * use-namespace: indicate the namespace used for the trace types. * trace-type: indicates the per-hop data to be captured by the IOAM enabled nodes and included in the node data list. * max-length: specifies the maximum length of the node data list in octets. The max-length is only defined at the encapsulation node. +--rw preallocated-tracing-profile {preallocated-trace}? +--rw enabled? boolean +--rw node-action? ioam-node-action +--rw trace-types | +--rw use-namespace? ioam-namespace | +--rw trace-type* ioam-trace-type +--rw max-length? uint32 3.3. Incremental Tracing Profile The incremental tracing option contains a variable node data fields where each node allocates and pushes its node data immediately following the option header. The "incremental-tracing-profile" contains the detailed information for the incremental tracing data. The detailed information is the same as the Preallocated Tracing Profile. Zhou, Ed., et al. Expires 31 August 2023 [Page 5] Internet-Draft YANG Model for IOAM February 2023 +--rw incremental-tracing-profile {incremental-trace}? +--rw enabled? boolean +--rw node-action? ioam-node-action +--rw trace-types | +--rw use-namespace? ioam-namespace | +--rw trace-type* ioam-trace-type +--rw max-length? uint32 3.4. Proof of Transit Profile The IOAM Proof of Transit data is to support the path or service function chain verification use cases. The "pot-profile" contains the detailed information for the proof of transit data. "pot-type" indicates a particular POT variant that specifies the POT data that is included. There may be several POT types, which have different configuration data. To align with [RFC9197], this document only defines IOAM POT type 0. User need to augment this module for the configuration of a specifc POT type. +--rw pot-profile {proof-of-transit}? +--rw enabled? boolean +--rw pot-type? ioam-pot-type 3.5. Edge-to-Edge Profile The IOAM edge-to-edge option is to carry data that is added by the IOAM encapsulating node and interpreted by IOAM decapsulating node. The "e2e-profile" contains the detailed information for the edge-to- edge data. The detailed information includes: * enabled: indicates whether the edge-to-edge profile is enabled. * node-action is the same semantic as in Section 2.2. * use-namespace: indicate the namespace used for the edge-to-edge types. * e2e-type: indicates data to be carried from the ingress IOAM node to the egress IOAM node. +--rw e2e-profile {edge-to-edge}? +--rw enabled? boolean +--rw node-action? ioam-node-action +--rw e2e-types +--rw use-namespace? ioam-namespace +--rw e2e-type* ioam-e2e-type Zhou, Ed., et al. Expires 31 August 2023 [Page 6] Internet-Draft YANG Model for IOAM February 2023 4. IOAM YANG Module file "ietf-ioam@2023-02-27.yang" module ietf-ioam { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-ioam"; prefix "ioam"; import ietf-access-control-list { prefix "acl"; reference "RFC 8519: YANG Data Model for Network Access Control Lists (ACLs)"; } import ietf-interfaces { prefix "if"; reference "RFC 8343: A YANG Data Model for Interface Management"; } import ietf-lime-time-types { prefix "lime"; reference "RFC 8532: Generic YANG Data Model for the Management of Operations, Administration, and Maintenance (OAM) Protocols That Use Connectionless Communications"; } organization "IETF IPPM (IP Performance Metrics) Working Group"; contact "WG Web: WG List: Editor: zhoutianran@huawei.com Editor: james.n.guichard@futurewei.com Editor: fbrockne@cisco.com Editor: srihari@cisco.com"; description "This YANG module specifies a vendor-independent data model for the In Situ OAM (IOAM). 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 Zhou, Ed., et al. Expires 31 August 2023 [Page 7] Internet-Draft YANG Model for IOAM February 2023 described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here. Copyright (c) 2023 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."; revision 2023-02-27 { description "First revision."; reference "RFC XXXX: A YANG Data Model for In-Situ OAM"; } /* * FEATURES */ feature incremental-trace { description "This feature indicated that the incremental tracing option is supported."; reference "RFC 9197: Data Fields for In-situ OAM"; } feature preallocated-trace { description "This feature indicated that the preallocated tracing option is supported."; reference "RFC 9197: Data Fields for In-situ OAM"; } feature proof-of-transit { description "This feature indicated that the proof of transit option is supported"; reference "RFC 9197: Data Fields for In-situ OAM"; Zhou, Ed., et al. Expires 31 August 2023 [Page 8] Internet-Draft YANG Model for IOAM February 2023 } feature edge-to-edge { description "This feature indicated that the edge-to-edge option is supported."; reference "RFC 9197: Data Fields for In-situ OAM"; } /* * IDENTITIES */ identity filter { description "Base identity to represent a filter. A filter is used to specify the flow to apply the IOAM profile. "; } identity acl-filter { base filter; description "Apply ACL rules to specify the flow."; } identity protocol { description "Base identity to represent the carrier protocol. It's used to indicate what layer and protocol the IOAM data is embedded."; } identity ipv6 { base protocol; description "The described IOAM data is embedded in IPv6 protocol."; reference "[I-D.ietf-ippm-ioam-ipv6-options]: In-situ OAM IPv6 Options"; } identity nsh { base protocol; description "The described IOAM data is embedded in NSH."; reference "[I-D.ietf-sfc-ioam-nsh]: Network Service Header (NSH) Encapsulation for In-situ OAM (IOAM) Data"; } Zhou, Ed., et al. Expires 31 August 2023 [Page 9] Internet-Draft YANG Model for IOAM February 2023 identity node-action { description "Base identity to represent the node actions. It's used to indicate what action the node will take."; } identity action-encapsulate { base node-action; description "It indicates the node is to encapsulate the IOAM packet"; } identity action-decapsulate { base node-action; description "It indicates the node is to decapsulate the IOAM packet"; } identity trace-type { description "Base identity to represent trace types."; } identity trace-hop-lim-node-id { base trace-type; description "It indicates the presence of Hop_Lim and node_id in the node data."; } identity trace-if-id { base trace-type; description "It indicates presence of ingress_if_id and egress_if_id (short format) in the node data."; } identity trace-timestamp-seconds { base trace-type; description "It indicates presence of timestamp seconds in the node data."; } identity trace-timestamp-fraction { base trace-type; description "It indicates presence of timestamp fraction in the node data."; Zhou, Ed., et al. Expires 31 August 2023 [Page 10] Internet-Draft YANG Model for IOAM February 2023 } identity trace-transit-delay { base trace-type; description "It indicates presence of transit delay in the node data."; } identity trace-namespace-data { base trace-type; description "It indicates presence of name space specific data (short format) in the node data."; } identity trace-queue-depth { base trace-type; description "It indicates presence of queue depth in the node data."; } identity trace-checksum-complement { base trace-type; description "It indicates presence of the Checksum Complement node data."; } identity trace-hop-lim-node-id-wide { base trace-type; description "It indicates presence of Hop_Lim and node_id in wide format in the node data."; } identity trace-if-id-wide { base trace-type; description "It indicates presence of ingress_if_id and egress_if_id in wide format in the node data."; } identity trace-namespace-data-wide { base trace-type; description "It indicates presence of IOAM-Namespace specific data in wide format in the node data."; } Zhou, Ed., et al. Expires 31 August 2023 [Page 11] Internet-Draft YANG Model for IOAM February 2023 identity trace-buffer-occupancy { base trace-type; description "It indicates presence of buffer occupancy in the node data."; } identity trace-opaque-state-snapshot { base trace-type; description "It indicates presence of variable length Opaque State Snapshot field."; } identity pot-type { description "Base identity to represent Proof of Transit (PoT) types."; } identity pot-type-0 { base pot-type; description "The IOAM POT Type field value is 0, and POT data is a 16 Octet field to carry data associated to POT procedures."; } identity e2e-type { description "Base identity to represent edge-to-edge types."; } identity e2e-seq-num-64 { base e2e-type; description "It indicates presence of a 64-bit sequence number."; } identity e2e-seq-num-32 { base e2e-type; description "It indicates the presence of a 32-bit sequence number."; } identity e2e-timestamp-seconds { base e2e-type; description "It indicates the presence of timestamp seconds representing the time at which the packet entered the IOAM-domain."; } Zhou, Ed., et al. Expires 31 August 2023 [Page 12] Internet-Draft YANG Model for IOAM February 2023 identity e2e-timestamp-fraction { base e2e-type; description "It indicates the presence of timestamp fraction representing the time at which the packet entered the IOAM-domain."; } identity namespace { description "Base identity to represent the Namespace-ID."; } identity default-namespace { base namespace; description "The Namespace-ID value of 0x0000 is defined as the Default-Namespace-ID and MUST be known to all the nodes implementing IOAM."; } /* * TYPE DEFINITIONS */ typedef ioam-filter-type { type identityref { base filter; } description "It specifies a known type of filter."; } typedef ioam-protocol-type { type identityref { base protocol; } description "It specifies a known type of carrier protocol for the IOAM data."; } typedef ioam-node-action { type identityref { base node-action; } description "It specifies a known type of node action."; } Zhou, Ed., et al. Expires 31 August 2023 [Page 13] Internet-Draft YANG Model for IOAM February 2023 typedef ioam-trace-type { type identityref { base trace-type; } description "It specifies a known trace type."; } typedef ioam-pot-type { type identityref { base pot-type; } description "It specifies a known pot type."; } typedef ioam-e2e-type { type identityref { base e2e-type; } description "It specifies a known edge-to-edge type."; } typedef ioam-namespace { type identityref { base namespace; } description "It specifies the supported namespace."; } /* * GROUP DEFINITIONS */ grouping ioam-filter { description "A grouping for IOAM filter definition"; leaf filter-type { type ioam-filter-type; description "filter type"; } leaf ace-name { when "derived-from-or-self(../filter-type, 'ioam:acl-filter')"; type leafref { path "/acl:acls/acl:acl/acl:aces/acl:ace/acl:name"; Zhou, Ed., et al. Expires 31 August 2023 [Page 14] Internet-Draft YANG Model for IOAM February 2023 } description "The Access Control Entry name is used to refer to an ACL specification."; } } grouping encap-tracing { description "A grouping for the generic configuration for tracing profile."; container trace-types { description "It indicates the list of trace types for encapsulation."; leaf use-namespace { type ioam-namespace; description "It indicates the name space used for encapsulation."; } leaf-list trace-type { type ioam-trace-type; description "The trace type is only defined at the encapsulation node."; } } leaf max-length { when "derived-from-or-self(../node-action, 'ioam:action-encapsulate')"; type uint32; units bytes; description "This field specifies the maximum length of the node data list in octets. The max-length is only defined at the encapsulation node."; } } grouping ioam-incremental-tracing-profile { description "A grouping for incremental tracing profile."; leaf node-action { type ioam-node-action; description Zhou, Ed., et al. Expires 31 August 2023 [Page 15] Internet-Draft YANG Model for IOAM February 2023 "This object indicates the action the node need to take, e.g. encapsulation."; } uses encap-tracing { when "derived-from-or-self(node-action, 'ioam:action-encapsulate')"; } } grouping ioam-preallocated-tracing-profile { description "A grouping for incremental tracing profile."; leaf node-action { type ioam-node-action; description "This indicates what action the node will take, e.g. encapsulation."; } uses encap-tracing { when "derived-from-or-self(node-action, 'ioam:action-encapsulate')"; } } grouping ioam-e2e-profile { description "A grouping for edge-to-edge profile."; leaf node-action { type ioam-node-action; description "It indicates how the node acts for this profile."; } container e2e-types { when "derived-from-or-self(../node-action, 'ioam:action-encapsulate')"; description "It indicates the list of edge-to-edge types for encapsulation."; leaf use-namespace { type ioam-namespace; Zhou, Ed., et al. Expires 31 August 2023 [Page 16] Internet-Draft YANG Model for IOAM February 2023 description "It indicates the name space used for encapsulation."; } leaf-list e2e-type { type ioam-e2e-type; description "The edge-to-edge type is only defined at the encapsulation node."; } } } grouping ioam-admin-config { description "IOAM top-level administrative configuration."; leaf enabled { type boolean; default false; description "This object is to control the availability of configuration. It MUST be true before anything in the /ioam/ioam-profiles/ioam-profile subtree can be edited. If false, any configuration in place is not used."; } } /* * DATA NODES */ container ioam { description "IOAM top level container"; container ioam-info { config false; description "Describes information such as units or timestamp format that assists monitoring systems in the interpretation of the IOAM data."; leaf timestamp-type { type identityref { base lime:timestamp-type; } description "Type of timestamp, such as Truncated PTP or NTP."; Zhou, Ed., et al. Expires 31 August 2023 [Page 17] Internet-Draft YANG Model for IOAM February 2023 } list available-interface { key "if-name"; description "A list of available interfaces that support IOAM."; leaf if-name { type if:interface-ref; description "This is a reference to the Interface name."; } } } container ioam-profiles { description "Contains a list of IOAM profiles."; container admin-config { description "Contains all the administrative configurations related to the IOAM functionalities and all the IOAM profiles."; uses ioam-admin-config; } list ioam-profile { key "profile-name"; description "A list of IOAM profiles that configured on the node. There is no mandatory type of profile (e.g., incremental-trace, preallocated-trace.) in the list. But at least one profile should be added."; leaf profile-name { type string{ length "1..300"; } description "Unique identifier for each IOAM profile."; } container filter { uses ioam-filter; description "The filter which is used to indicate the flow to apply IOAM."; } Zhou, Ed., et al. Expires 31 August 2023 [Page 18] Internet-Draft YANG Model for IOAM February 2023 leaf protocol-type { type ioam-protocol-type; description "This item is used to indicate the carrier protocol where the IOAM is applied."; } container incremental-tracing-profile { if-feature incremental-trace; description "It describes the profile for incremental tracing option."; leaf enabled { type boolean; default false; description "When true, apply incremental tracing option to the specified flow identified by the filter."; } uses ioam-incremental-tracing-profile; } container preallocated-tracing-profile { if-feature preallocated-trace; description "It describes the profile for preallocated tracing option."; leaf enabled { type boolean; default false; description "When true, apply preallocated tracing option to the specified flow identified by the following filter."; } uses ioam-preallocated-tracing-profile; } container pot-profile { if-feature proof-of-transit; description "It describes the profile for PoT option."; leaf enabled { type boolean; Zhou, Ed., et al. Expires 31 August 2023 [Page 19] Internet-Draft YANG Model for IOAM February 2023 default false; description "When true, apply Proof of Transit option to the specified flow identified by the following filter."; } leaf pot-type { type ioam-pot-type; description "The type of a particular POT variant that specifies the POT data that is included."; } } container e2e-profile { if-feature edge-to-edge; description "It describes the profile for edge-to-edge option."; leaf enabled { type boolean; default false; description "When true, apply edge-to-edge option to the specified flow identified by the following filter."; } uses ioam-e2e-profile; } } } } } 5. Security Considerations The YANG module specified in this document defines 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]. Zhou, Ed., et al. Expires 31 August 2023 [Page 20] Internet-Draft YANG Model for IOAM February 2023 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 a number of data nodes defined in this YANG module 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 are the subtrees and data nodes and their sensitivity/vulnerability: * /ioam/ioam-profiles/admin-config The items in the container above include the top level administrative configurations related to the IOAM functionalities and all the IOAM profiles. Unexpected changes to these items could lead to the IOAM function disruption and/ or misbehavior of all the IOAM profiles. * /ioam/ioam-profiles/ioam-profile The entries in the list above include the whole IOAM profile configurations which indirectly create or modify the device configurations. Unexpected changes to these entries could lead to the mistake of the IOAM behavior for the corresponding flows. 6. IANA Considerations RFC Ed.: In this section, replace all occurrences of 'XXXX' with the actual RFC number (and remove this note). IANA is requested to assign a new URI from the IETF XML Registry [RFC3688]. The following URI is suggested: URI: urn:ietf:params:xml:ns:yang:ietf-ioam Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. This document also requests a new YANG module name in the YANG Module Names registry [RFC7950] with the following suggestion: name: ietf-ioam namespace: urn:ietf:params:xml:ns:yang:ietf-ioam prefix: ioam reference: RFC XXXX Zhou, Ed., et al. Expires 31 August 2023 [Page 21] Internet-Draft YANG Model for IOAM February 2023 7. Acknowledgements For their valuable comments, discussions, and feedback, we wish to acknowledge Greg Mirsky, Reshad Rahman, Tom Petch and Mickey Spiegel. 8. Normative References [I-D.ietf-ippm-ioam-ipv6-options] Bhandari, S. and F. Brockners, "In-situ OAM IPv6 Options", Work in Progress, Internet-Draft, draft-ietf-ippm-ioam- ipv6-options-09, 11 October 2022, . [I-D.ietf-sfc-ioam-nsh] Brockners, F. and S. Bhandari, "Network Service Header (NSH) Encapsulation for In-situ OAM (IOAM) Data", Work in Progress, Internet-Draft, draft-ietf-sfc-ioam-nsh-11, 30 September 2022, . [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, . [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, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . Zhou, Ed., et al. Expires 31 August 2023 [Page 22] Internet-Draft YANG Model for IOAM February 2023 [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 8343, DOI 10.17487/RFC8343, March 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . [RFC8519] Jethanandani, M., Agarwal, S., Huang, L., and D. Blair, "YANG Data Model for Network Access Control Lists (ACLs)", RFC 8519, DOI 10.17487/RFC8519, March 2019, . [RFC8532] Kumar, D., Wang, Z., Wu, Q., Ed., Rahman, R., and S. Raghavan, "Generic YANG Data Model for the Management of Operations, Administration, and Maintenance (OAM) Protocols That Use Connectionless Communications", RFC 8532, DOI 10.17487/RFC8532, April 2019, . [RFC9197] Brockners, F., Ed., Bhandari, S., Ed., and T. Mizrahi, Ed., "Data Fields for In Situ Operations, Administration, and Maintenance (IOAM)", RFC 9197, DOI 10.17487/RFC9197, May 2022, . Appendix A. An Example of Incremental Tracing Profile An example of incremental tracing profile is depicted in the following figure. This configuration is received by an IOAM ingress node. This node encapsulates the IOAM data in IPv6 Hop by Hop option header. The trace type indicates that each on path node need to capture the transit delay, and add to the IOAM node data list. The incremental tracing data space is variable, however, the node data list must not exceed 512 bytes. Zhou, Ed., et al. Expires 31 August 2023 [Page 23] Internet-Draft YANG Model for IOAM February 2023 true ietf-test-profile ipv6 true action-encapsulate default-namespace trace-transit-delay 512 Appendix B. An Example of Pre-allocated Tracing Profile An example of pre-allocated tracing profile is depicted in the following figure. This configuration is received by an IOAM ingress node. This node firstly identifies the target flow by using ACL "test-acl", and then encapsulates the IOAM data in the NSH header. The trace type indicates that each on path node need to capture the name space specific data in the short format, and add to the IOAM node data list. This node preallocates the node data list in the packect with 512 bytes. Zhou, Ed., et al. Expires 31 August 2023 [Page 24] Internet-Draft YANG Model for IOAM February 2023 true ietf-test-profile acl-filter test-acl nsh true action-encapsulate default-namespace trace-namespace-data 512 Appendix C. An Example of Prove of Transit Profile The following figure is a simple example of POT option. This configuration indicates the node to apply POT type 0 with IPv6 encapsulation. Zhou, Ed., et al. Expires 31 August 2023 [Page 25] Internet-Draft YANG Model for IOAM February 2023 true ietf-test-profile ipv6 true pot-type-0 Appendix D. An Example of Edge-to-Edge Profile The following figure shows an example of edge-to-edge option. This configuration is received by an IOAM egress node. This node detects the IOAM edge-to-edge option in the IPv6 extension header, and removes the option to clean all the IOAM data. As the IOAM egress node, it may collect the edge-to-edge data and deliver to the data exporting process. Zhou, Ed., et al. Expires 31 August 2023 [Page 26] Internet-Draft YANG Model for IOAM February 2023 true ietf-test-profile ipv6 true action-decapsulate Authors' Addresses Tianran Zhou Huawei 156 Beiqing Rd. Beijing 100095 China Email: zhoutianran@huawei.com Jim Guichard Futurewei United States of America Email: james.n.guichard@futurewei.com Frank Brockners Cisco Systems Hansaallee 249, 3rd Floor 40549 Duesseldorf Germany Email: fbrockne@cisco.com Zhou, Ed., et al. Expires 31 August 2023 [Page 27] Internet-Draft YANG Model for IOAM February 2023 Srihari Raghavan Cisco Systems Tril Infopark Sez, Ramanujan IT City Neville Block, 2nd floor, Old Mahabalipuram Road Chennai 600113 Tamil Nadu India Email: srihari@cisco.com Zhou, Ed., et al. Expires 31 August 2023 [Page 28]