Network Working Group D. Kumar Internet-Draft Cisco Intended status: Standards Track M. Wang Expires: April 27, 2018 Q. Wu Huawei R. Rahman S. Raghavan Cisco October 24, 2017 Retrieval Methods YANG Data Model for Connectionless Operations, Administration, and Maintenance(OAM) protocols draft-ietf-lime-yang-connectionless-oam-methods-11 Abstract This document presents a retrieval method YANG Data model for connectionless OAM protocols. It provides technology-independent RPC operations for connectionless OAM protocols. The retrieval methods model presented here can be extended to include technology specific details. This is leading to uniformity between OAM protocols and support both nested OAM workflows (i.e., performing OAM functions at different levels through a unified interface) and interacting OAM workflows ( i.e., performing OAM functions at same levels through a unified interface). 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 April 27, 2018. Kumar, et al. Expires April 27, 2018 [Page 1] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 Copyright Notice Copyright (c) 2017 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 Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions used in this document . . . . . . . . . . . . . . 3 2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 2.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 4 3. Overview of the Connectionless OAM retrieval methods Model . 4 3.1. RPC operation definitions . . . . . . . . . . . . . . . . 5 3.2. OAM Retrieval Methods Hierarchy . . . . . . . . . . . . . 8 4. OAM Retrieval Methods YANG Module . . . . . . . . . . . . . . 15 5. Security Considerations . . . . . . . . . . . . . . . . . . . 21 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 22 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.1. Normative References . . . . . . . . . . . . . . . . . . 23 7.2. Informative References . . . . . . . . . . . . . . . . . 24 Appendix A. Appdendix A.1 Extending Connectionless OAM Method Module Example . . . . . . . . . . . . . . . . . . . 24 Appendix B. Appendix A.2 Example of new retrieval procedures Model . . . . . . . . . . . . . . . . . . . . . . . 25 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 35 1. Introduction Operations, Administration, and Maintenance (OAM) are important networking functions that allow operators to: 1. Monitor reachability of destinations (Reachability Verification, Continuity Check). 2. Troubleshoot failures (Fault verification and localization). 3. Monitor Performance Kumar, et al. Expires April 27, 2018 [Page 2] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 An overview of OAM tools is presented at [RFC7276]. Ping and Traceroute [RFC792], [RFC4443] and BFD [RFC5880] are well- known fault verification and isolation tools, respectively, for IP networks. Over the years, different technologies have developed similar tools for similar purposes. In this document, we present an on-demand retrieval method YANG Data model for connectionless OAM protocols. This model provides technology-independent RPC operations for connectionless OAM protocols. It is separated from the generic YANG model for connectionless OAM [I-D.ietf-lime-yang-connectionless-oam] and can avoid mixing the models for the retrieved-data from the retrieval procedures. It is expected that retrieval procedures would evolve faster than the data model [I-D.ietf-lime-yang-connectionless-oam] and will allow new procedures to be defined for retrieval of the same data defined by the base data model. 2. Conventions used in this document The following terms are defined in [RFC6241] and are not redefined here: o client o configuration data o server o state data The following terms are defined in [RFC6020] and are not redefined here: o augment o data model o data node The terminology for describing YANG data models is found in [RFC6020]. 2.1. Terminology TP - Test Point MAC - Media Access Control Kumar, et al. Expires April 27, 2018 [Page 3] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 RPC - A Remote Procedure Call RPC operation - A specific Remote Procedure Call 2.2. Tree Diagrams A simplified graphical representation of the data model is used in this document. The meaning of the symbols in these diagrams is as follows: Each node is printed as: is one of: + for current is one of: rw for configuration data ro for non-configuration data -x for rpcs -n for notifications is the name of the node If the node is augmented into the tree from another module, its name is printed as :. is one of: ? for an optional leaf or choice ! for a presence container * for a leaf-list or list [] for a list's keys is the name of the type for leafs and leaf-lists 3. Overview of the Connectionless OAM retrieval methods Model In this document, we present an on-demand retrieval method YANG Data model for connectionless OAM protocols. This model provides technology-independent retrieval procedures (RPC operations) for connectionless OAM protocols. It provides a flexible way to retrieve the data which defined by the "ietf-connectionless-oam.yang" [I-D.ietf-lime-yang-connectionless-oam]. Kumar, et al. Expires April 27, 2018 [Page 4] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 3.1. RPC operation definitions The RPC model facilitates issuing commands to a NETCONF server (in this case to the device that need to execute the OAM command) and obtaining a response. Under 'connectionless-oam-methods' module, we summarize common OAM functions and define two generic RPC operations: 'continuity-check' and 'path-discovery'. In practice, these RPC operations are activated on-demand and supported by corresponding technology- specific OAM tools [RFC7276]. For example, for the IP OAM model, the continuity-check RPC corresponds to the IP Ping [RFC792] [RFC4443], while the path-discovery RPC operation corresponds to IP Traceroute [RFC792] [RFC4443]. Note that the RPC operation presented in this document is the base building block, which is used to derive a model for a technology- specific OAM (i.e., ICMP ping [RFC792] [RFC4443], LSP ping [RFC8029]), the base building block should be extended with corresponding technology specific parameters. To facilitate this for future enhancements to data retrieval methods, the RPCs are captured under a separate module. The generic 'path-discovery-data' and 'continuity-check-data' groupings are used as data outputs from different RPCs described in this document. Similar methods including other RPCs can retrieve the data using the same data model. rpc continuity-check { if-feature cl-oam:continuity-check; description "Continuity-check RPC operation as per RFC7276."; input { uses rpc-input-parameters; .... } output { container error-code { leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used in CC. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; Kumar, et al. Expires April 27, 2018 [Page 5] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code for CC."; } leaf status-sub-code { type identityref{ base status-sub-code; } mandatory true; description "Sub code for CC."; } description "Error code and Sub Code for CC."; } uses cl-oam:continuity-check-data; } } rpc path-discovery { description "path discovery RPC operation as per RFC7276."; input { uses rpc-input-parameters; ..... } output { list response-list { key "response-index"; description "Path discovery response list."; leaf response-index { type uint32; mandatory true; description Kumar, et al. Expires April 27, 2018 [Page 6] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 "Response index."; } leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used in PD. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code for Path Discovery. "; } leaf status-sub-code { type identityref{ base status-sub-code; } mandatory true; description "Sub code for Path Discovery. "; } } uses cl-oam:path-discovery-data; } } Snippet of data hierarchy related to RPC operations Kumar, et al. Expires April 27, 2018 [Page 7] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 3.2. OAM Retrieval Methods Hierarchy The complete data hierarchy related to the Connectionless OAM Retrieval Methods YANG model is presented below. module: ietf-connectionless-oam-methods rpcs: +---x continuity-check {cl-oam:continuity-check}? | +---w input | | +---w destination-tp | | | +---w tp-location-type identityref | | | +---w mac-address | | | | +---w mac-address yang:mac-address | | | +---w ipv4-address | | | | +---w ipv4-address inet:ipv4-address | | | +---w ipv6-address | | | | +---w ipv6-address inet:ipv6-address | | | +---w tp-attribute | | | | +---w tp-attribute-type? address-attribute-type | | | | +---w (tp-attribute-value)? | | | | +--:(ip-prefix) | | | | | +---w ip-prefix? inet:ip-prefix | | | | +--:(bgp) | | | | | +---w bgp? inet:ip-prefix | | | | +--:(tunnel) | | | | | +---w tunnel-interface? uint32 | | | | +--:(pw) | | | | | +---w remote-pe-address? inet:ip-address | | | | | +---w pw-id? uint32 | | | | +--:(vpls) | | | | | +---w route-distinguisher? rt:route-distinguisher | | | | | +---w sender-ve-id? uint16 | | | | | +---w receiver-ve-id? uint16 | | | | +--:(mpls-mldp) | | | | +---w (root-address)? | | | | +--:(ip-address) | | | | | +---w source-address? inet:ip-address | | | | | +---w group-ip-address? inet:ip-address | | | | +--:(vpn) | | | | | +---w as-number? inet:as-number | | | | +--:(global-id) | | | | +---w lsp-id? string | | | +---w system-info | | | +---w system-id? rt:router-id | | +---w source-interface if:interface-ref | | +---w outbound-interface if:interface-ref | | +---w vrf? cl-oam:routing-instance-ref | | +---w session-type? enumeration Kumar, et al. Expires April 27, 2018 [Page 8] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 | | +---w count? uint32 | | +---w ttl? uint8 | | +---w packet-size? uint32 | +--ro output | +--ro error-code | | +--ro protocol-id identityref | | +--ro protocol-id-meta-data? uint64 | | +--ro status-code identityref | | +--ro status-sub-code identityref | +--ro src-test-point | | +--ro ni? routing-instance-ref | | +--ro tp-location-type identityref | | +--ro mac-address | | | +--ro mac-address yang:mac-address | | +--ro ipv4-address | | | +--ro ipv4-address inet:ipv4-address | | +--ro ipv6-address | | | +--ro ipv6-address inet:ipv6-address | | +--ro tp-attribute | | | +--ro tp-attribute-type? address-attribute-type | | | +--ro (tp-attribute-value)? | | | +--:(ip-prefix) | | | | +--ro ip-prefix? inet:ip-prefix | | | +--:(bgp) | | | | +--ro bgp? inet:ip-prefix | | | +--:(tunnel) | | | | +--ro tunnel-interface? uint32 | | | +--:(pw) | | | | +--ro remote-pe-address? inet:ip-address | | | | +--ro pw-id? uint32 | | | +--:(vpls) | | | | +--ro route-distinguisher? rt:route-distinguisher | | | | +--ro sender-ve-id? uint16 | | | | +--ro receiver-ve-id? uint16 | | | +--:(mpls-mldp) | | | +--ro (root-address)? | | | +--:(ip-address) | | | | +--ro source-address? inet:ip-address | | | | +--ro group-ip-address? inet:ip-address | | | +--:(vpn) | | | | +--ro as-number? inet:as-number | | | +--:(global-id) | | | +--ro lsp-id? string | | +--ro system-info | | | +--ro system-id? rt:router-id | | +--ro egress-intf-name? if:interface-ref | +--ro dest-test-point | | +--ro ni? routing-instance-ref Kumar, et al. Expires April 27, 2018 [Page 9] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 | | +--ro tp-location-type identityref | | +--ro mac-address | | | +--ro mac-address yang:mac-address | | +--ro ipv4-address | | | +--ro ipv4-address inet:ipv4-address | | +--ro ipv6-address | | | +--ro ipv6-address inet:ipv6-address | | +--ro tp-attribute | | | +--ro tp-attribute-type? address-attribute-type | | | +--ro (tp-attribute-value)? | | | +--:(ip-prefix) | | | | +--ro ip-prefix? inet:ip-prefix | | | +--:(bgp) | | | | +--ro bgp? inet:ip-prefix | | | +--:(tunnel) | | | | +--ro tunnel-interface? uint32 | | | +--:(pw) | | | | +--ro remote-pe-address? inet:ip-address | | | | +--ro pw-id? uint32 | | | +--:(vpls) | | | | +--ro route-distinguisher? rt:route-distinguisher | | | | +--ro sender-ve-id? uint16 | | | | +--ro receiver-ve-id? uint16 | | | +--:(mpls-mldp) | | | +--ro (root-address)? | | | +--:(ip-address) | | | | +--ro source-address? inet:ip-address | | | | +--ro group-ip-address? inet:ip-address | | | +--:(vpn) | | | | +--ro as-number? inet:as-number | | | +--:(global-id) | | | +--ro lsp-id? string | | +--ro system-info | | | +--ro system-id? rt:router-id | | +--ro ingress-intf-name? if:interface-ref | +--ro sequence-number? uint64 | +--ro hop-cnt? uint8 | +--ro session-packet-statistics | | +--ro rx-packet-count? uint32 | | +--ro tx-packet-count? uint32 | | +--ro rx-bad-packet? uint32 | | +--ro tx-packet-failed? uint32 | +--ro session-error-statistics | | +--ro packet-loss-count? uint32 | | +--ro loss-ratio? uint8 | | +--ro packet-reorder-count? uint32 | | +--ro packets-out-of-seq-count? uint32 | | +--ro packets-dup-count? uint32 Kumar, et al. Expires April 27, 2018 [Page 10] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 | +--ro session-delay-statistics | | +--ro time-interval-value? identityref | | +--ro min-delay-value? uint32 | | +--ro max-delay-value? uint32 | | +--ro average-delay-value? uint32 | +--ro session-jitter-statistics | +--ro interval-value? identityref | +--ro min-jitter-value? uint32 | +--ro max-jitter-value? uint32 | +--ro average-jitter-value? uint32 +---x path-discovery {cl-oam:path-discovery}? +---w input | +---w destination-tp | | +---w tp-location-type identityref | | +---w mac-address | | | +---w mac-address yang:mac-address | | +---w ipv4-address | | | +---w ipv4-address inet:ipv4-address | | +---w ipv6-address | | | +---w ipv6-address inet:ipv6-address | | +---w tp-attribute | | | +---w tp-attribute-type? address-attribute-type | | | +---w (tp-attribute-value)? | | | +--:(ip-prefix) | | | | +---w ip-prefix? inet:ip-prefix | | | +--:(bgp) | | | | +---w bgp? inet:ip-prefix | | | +--:(tunnel) | | | | +---w tunnel-interface? uint32 | | | +--:(pw) | | | | +---w remote-pe-address? inet:ip-address | | | | +---w pw-id? uint32 | | | +--:(vpls) | | | | +---w route-distinguisher? rt:route-distinguisher | | | | +---w sender-ve-id? uint16 | | | | +---w receiver-ve-id? uint16 | | | +--:(mpls-mldp) | | | +---w (root-address)? | | | +--:(ip-address) | | | | +---w source-address? inet:ip-address | | | | +---w group-ip-address? inet:ip-address | | | +--:(vpn) | | | | +---w as-number? inet:as-number | | | +--:(global-id) | | | +---w lsp-id? string | | +---w system-info | | +---w system-id? rt:router-id | +---w source-interface if:interface-ref Kumar, et al. Expires April 27, 2018 [Page 11] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 | +---w outbound-interface if:interface-ref | +---w vrf? cl-oam:routing-instance-ref | +---w session-type? enumeration | +---w max-ttl? uint8 +--ro output +--ro response-list* [response-index] | +--ro response-index uint32 | +--ro protocol-id identityref | +--ro protocol-id-meta-data? uint64 | +--ro status-code identityref | +--ro status-sub-code identityref +--ro src-test-point | +--ro ni? routing-instance-ref | +--ro tp-location-type identityref | +--ro mac-address | | +--ro mac-address yang:mac-address | +--ro ipv4-address | | +--ro ipv4-address inet:ipv4-address | +--ro ipv6-address | | +--ro ipv6-address inet:ipv6-address | +--ro tp-attribute | | +--ro tp-attribute-type? address-attribute-type | | +--ro (tp-attribute-value)? | | +--:(ip-prefix) | | | +--ro ip-prefix? inet:ip-prefix | | +--:(bgp) | | | +--ro bgp? inet:ip-prefix | | +--:(tunnel) | | | +--ro tunnel-interface? uint32 | | +--:(pw) | | | +--ro remote-pe-address? inet:ip-address | | | +--ro pw-id? uint32 | | +--:(vpls) | | | +--ro route-distinguisher? rt:route-distinguisher | | | +--ro sender-ve-id? uint16 | | | +--ro receiver-ve-id? uint16 | | +--:(mpls-mldp) | | +--ro (root-address)? | | +--:(ip-address) | | | +--ro source-address? inet:ip-address | | | +--ro group-ip-address? inet:ip-address | | +--:(vpn) | | | +--ro as-number? inet:as-number | | +--:(global-id) | | +--ro lsp-id? string | +--ro system-info | +--ro system-id? rt:router-id +--ro dest-test-point Kumar, et al. Expires April 27, 2018 [Page 12] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 | +--ro ni? routing-instance-ref | +--ro tp-location-type identityref | +--ro mac-address | | +--ro mac-address yang:mac-address | +--ro ipv4-address | | +--ro ipv4-address inet:ipv4-address | +--ro ipv6-address | | +--ro ipv6-address inet:ipv6-address | +--ro tp-attribute | | +--ro tp-attribute-type? address-attribute-type | | +--ro (tp-attribute-value)? | | +--:(ip-prefix) | | | +--ro ip-prefix? inet:ip-prefix | | +--:(bgp) | | | +--ro bgp? inet:ip-prefix | | +--:(tunnel) | | | +--ro tunnel-interface? uint32 | | +--:(pw) | | | +--ro remote-pe-address? inet:ip-address | | | +--ro pw-id? uint32 | | +--:(vpls) | | | +--ro route-distinguisher? rt:route-distinguisher | | | +--ro sender-ve-id? uint16 | | | +--ro receiver-ve-id? uint16 | | +--:(mpls-mldp) | | +--ro (root-address)? | | +--:(ip-address) | | | +--ro source-address? inet:ip-address | | | +--ro group-ip-address? inet:ip-address | | +--:(vpn) | | | +--ro as-number? inet:as-number | | +--:(global-id) | | +--ro lsp-id? string | +--ro system-info | +--ro system-id? rt:router-id +--ro sequence-number? uint64 +--ro hop-cnt? uint8 +--ro session-packet-statistics | +--ro rx-packet-count? uint32 | +--ro tx-packet-count? uint32 | +--ro rx-bad-packet? uint32 | +--ro tx-packet-failed? uint32 +--ro session-error-statistics | +--ro packet-loss-count? uint32 | +--ro loss-ratio? uint8 | +--ro packet-reorder-count? uint32 | +--ro packets-out-of-seq-count? uint32 | +--ro packets-dup-count? uint32 Kumar, et al. Expires April 27, 2018 [Page 13] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 +--ro session-delay-statistics | +--ro time-interval-value? identityref | +--ro min-delay-value? uint32 | +--ro max-delay-value? uint32 | +--ro average-delay-value? uint32 +--ro session-jitter-statistics | +--ro interval-value? identityref | +--ro min-jitter-value? uint32 | +--ro max-jitter-value? uint32 | +--ro average-jitter-value? uint32 +--ro path-verification | +--ro flow-info? string | +--ro session-path-verification-statistics | +--ro verified-count? uint32 | +--ro failed-count? uint32 +--ro path-trace-info +--ro path-trace-info-list* [index] +--ro index uint32 +--ro ni? routing-instance-ref +--ro tp-location-type identityref +--ro mac-address | +--ro mac-address yang:mac-address +--ro ipv4-address | +--ro ipv4-address inet:ipv4-address +--ro ipv6-address | +--ro ipv6-address inet:ipv6-address +--ro tp-attribute | +--ro tp-attribute-type? address-attribute-type | +--ro (tp-attribute-value)? | +--:(ip-prefix) | | +--ro ip-prefix? inet:ip-prefix | +--:(bgp) | | +--ro bgp? inet:ip-prefix | +--:(tunnel) | | +--ro tunnel-interface? uint32 | +--:(pw) | | +--ro remote-pe-address? inet:ip-address | | +--ro pw-id? uint32 | +--:(vpls) | | +--ro route-distinguisher? rt:route-distinguisher | | +--ro sender-ve-id? uint16 | | +--ro receiver-ve-id? uint16 | +--:(mpls-mldp) | +--ro (root-address)? | +--:(ip-address) | | +--ro source-address? inet:ip-address | | +--ro group-ip-address? inet:ip-address | +--:(vpn) Kumar, et al. Expires April 27, 2018 [Page 14] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 | | +--ro as-number? inet:as-number | +--:(global-id) | +--ro lsp-id? string +--ro system-info | +--ro system-id? rt:router-id +--ro timestamp-type? identityref +--ro timestamp-64bit | +--ro timestamp-sec? uint32 | +--ro timestamp-nanosec? uint32 +--ro timestamp-80bit {ptp-long-format}? | +--ro timestamp-sec? uint64 | +--ro timestamp-nanosec? uint32 +--ro ntp-timestamp-32bit {ntp-short-format}? | +--ro timestamp-sec? uint16 | +--ro timestamp-nanosec? uint16 +--ro icmp-timestamp-32bit {icmp-timestamp}? | +--ro timestamp-millisec? uint32 +--ro ingress-intf-name? if:interface-ref +--ro egress-intf-name? if:interface-ref +--ro queue-depth? uint32 +--ro transit-delay? uint32 +--ro app-meta-data? uint64 data hierarchy of OAM Retrieval Methods 4. OAM Retrieval Methods YANG Module file "ietf-connectionless-oam-methods@2017-09-06.yang" module ietf-connectionless-oam-methods { namespace "urn:ietf:params:xml:ns:yang:ietf-connectionless-oam-methods"; prefix cloam-methods; import ietf-interfaces { prefix if; } import ietf-connectionless-oam { prefix cl-oam; } organization "IETF LIME Working Group"; contact "Deepak Kumar dekumar@cisco.com Qin Wu bill.wu@huawei.com S Raghavan srihari@cisco.com Zitao Wang wangzitao@huawei.com R Rahman rrahman@cisco.com"; description "This YANG module defines the RPC operations for Kumar, et al. Expires April 27, 2018 [Page 15] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 connectionless OAM to be used within IETF in a protocol Independent manner. It is assumed that each protocol maps corresponding abstracts to its native format. Each protocol may extend the YANG model defined here to include protocol specific extensions"; revision 2017-09-06{ description "08 version"; reference "draft-ietf-lime-yang-connectionless-oam-methods"; } identity protocol-id { description "A generic protocol identifier."; } identity protocol-id-internet { base protocol-id; description "Internet Protocols."; } identity protocol-id-proprietary { base protocol-id; description "Proprietary protocol (e.g.,IP SLA)."; } identity protocol-id-sfc { base protocol-id; description "Service Function Chaining."; } identity protocol-id-mpls { base protocol-id; description "MPLS protocol."; } identity protocol-id-mpls-tp { base protocol-id; description "MPLS-TP protocol."; } Kumar, et al. Expires April 27, 2018 [Page 16] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 identity protocol-id-twamp { base protocol-id; description "TWAMP protocol."; } identity protocol-id-bier { base protocol-id; description "BIER protocol."; } identity status-code{ description "Base status code"; } identity invalid-cc{ base status-code; description "Indicates that the Continuity check message is invalid"; } identity invalid-pd { base status-code; description "Indicates that the path discovery message is invalid"; } identity status-sub-code { description "Base status sub code"; } grouping rpc-input-parameters { container destination-tp { uses cl-oam:tp-address; description "Destination test point."; } leaf source-interface { type if:interface-ref; mandatory true; description "Source interface."; } leaf outbound-interface { type if:interface-ref; Kumar, et al. Expires April 27, 2018 [Page 17] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 mandatory true; description "Outbound interface."; } leaf vrf { type cl-oam:routing-instance-ref; description "VRF instance."; } description "Grouping for RPC input parameters"; } rpc continuity-check { if-feature "cl-oam:continuity-check"; description "Continuity-check RPC operation as per RFC7276."; input { uses rpc-input-parameters; uses cl-oam:session-type { description "If session-type is specified, then session-type must be set to on-demand"; } leaf count { type uint32 { range 0..4294967295 { description "The overall number of packet to be transmitted by the sender. If the count is set to 4294967295, it indicates that the session will be run forever"; } } default "5"; description "Specifies the number of packets that will be sent. By default, the packet number is set to 5."; } leaf ttl { type uint8; default "255"; description "Time to live (TTL) used to limit lifetime of data packet transmitted in the network and prevent looping. The TTL value is decremented for every hop which the packet traverses. If the TTL is zero, the data packet will be discarded."; } Kumar, et al. Expires April 27, 2018 [Page 18] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 leaf packet-size { type uint32 { range "64..10000"; } default "64"; description "Packet size of continuity-check message, in octets. By default, the packet size is set to 64 octets."; } } output { container error-code { leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used in CC. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code for continuity-check message, that is relevant to the protocol under use for CC. For example if ICMP is the protocol under use, the error codes are as defined in [RFC4443]."; } leaf status-sub-code { type identityref{ base status-sub-code; } mandatory true; description Kumar, et al. Expires April 27, 2018 [Page 19] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 "Error sub code for continuity-check message, that is relevant to the error-code reported of the protocol that is used for CC."; } description "Error code and Sub Code for continuity-check message."; } uses cl-oam:continuity-check-data; } } rpc path-discovery { if-feature "cl-oam:path-discovery"; description "Path discovery RPC operation as per RFC7276."; input { uses rpc-input-parameters; uses cl-oam:session-type { description "If session-type is specified, then session-type must be set to on-demand"; } leaf max-ttl { type uint8; default "255"; description "Maximum TTL indicates the maixmum number of hops that a packet is permitted to travel before being discarded by a router. By default, the maximimum TTL is set to 255."; } } output { list response-list { key "response-index"; description "Path discovery response list."; leaf response-index { type uint32; mandatory true; description "Response index."; } leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used in PD. This could be a standard Kumar, et al. Expires April 27, 2018 [Page 20] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code for path-discovery response message, that is relevant to the protocol under use for PD. For example if ICMP is the protocol under use, the error codes are as defined in [RFC4443]."; } leaf status-sub-code { type identityref{ base status-sub-code; } mandatory true; description "Error sub code for path-discovery message, that is relevant to the error-code reported of the protocol that is used for PD."; } } uses cl-oam:path-discovery-data; } } } 5. Security Considerations The YANG module defined in this document 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 Kumar, et al. Expires April 27, 2018 [Page 21] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC5246]. The NETCONF access control model [RFC6536] 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. Some of the RPC operations in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control access to these operations. These are the operations and their sensitivity/vulnerability: o continuity-check: Generates continuity check. o path-discovery: Generates path discovery. These operations are used to retrieve the data from the device that need to execute the OAM command. Unauthorized source access to some sensitive information in the above data may lead to Denial-of-Service attack on both the local device and the network. 6. IANA Considerations This document registers a URI in the IETF XML registry [RFC3688]. Following the format in [RFC3688], the following registration is requested to be made: URI: urn:ietf:params:xml:ns:yang:ietf-connectionless-oam-methods Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. This document registers a YANG module in the YANG Module Names registry [RFC6020]. name: ietf-connectionless-oam-methods namespace: urn:ietf:params:xml:ns:yang:ietf-connectionless-oam- methods prefix: cloam-methods reference: RFC XXXX Kumar, et al. Expires April 27, 2018 [Page 22] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 7. References 7.1. Normative References [I-D.ietf-lime-yang-connectionless-oam] Kumar, D., Wang, Z., Wu, Q., Rahman, R., and S. Raghavan, "Generic YANG Data Model for Operations, Administration, and Maintenance(OAM) protocols for Connectionless networks", draft-ietf-lime-yang-connectionless-oam-13 (work in progress), October 2017. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) Protocol Version 1.2", RFC 5246, DOI 10.17487/RFC5246, August 2008, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration Protocol (NETCONF) Access Control Model", RFC 6536, DOI 10.17487/RFC6536, March 2012, . [RFC7011] Claise, B., Ed., Trammell, B., Ed., and P. Aitken, "Specification of the IP Flow Information Export (IPFIX) Protocol for the Exchange of Flow Information", STD 77, RFC 7011, DOI 10.17487/RFC7011, September 2013, . [RFC792] Postel, J., "Internet Control Message Protocol", RFC 792, September 1981. Kumar, et al. Expires April 27, 2018 [Page 23] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . 7.2. Informative References [I-D.ietf-netconf-yang-push] Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen- Nygaard, E., Bierman, A., and B. Lengyel, "Subscribing to YANG datastore push updates", draft-ietf-netconf-yang- push-10 (work in progress), October 2017. [RFC4443] Conta, A., Deering, S., and M. Gupta, Ed., "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification", STD 89, RFC 4443, DOI 10.17487/RFC4443, March 2006, . [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010, . [RFC6087] Bierman, A., "Guidelines for Authors and Reviewers of YANG Data Model Documents", RFC 6087, DOI 10.17487/RFC6087, January 2011, . [RFC7276] Mizrahi, T., Sprecher, N., Bellagamba, E., and Y. Weingarten, "An Overview of Operations, Administration, and Maintenance (OAM) Tools", RFC 7276, DOI 10.17487/RFC7276, June 2014, . [RFC8029] Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N., Aldrin, S., and M. Chen, "Detecting Multiprotocol Label Switched (MPLS) Data-Plane Failures", RFC 8029, DOI 10.17487/RFC8029, March 2017, . Appendix A. Appdendix A.1 Extending Connectionless OAM Method Module Example The following is an example of extensions possible to "ietf- connectionless-oam-methods" YANG model defined in this document. The snippet below depicts an example of augmenting the "ietf- connectionless-oam-methods" YANG model with ICMP ping attributes: Kumar, et al. Expires April 27, 2018 [Page 24] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 augment "/cloam-methods:continutiy-check" +"/cloam-methods:output"{ container session-rtt-statistics{ leaf min-rtt{ type uint32; description "This minimum ping round-trip-time(RTT) received."; } leaf max-rtt{ type uint32; description "This maximum ping round-trip-time(RTT) received."; } leaf avg-rtt{ type uint32; description "The current average ping round-trip-time(RTT)"; } description "This container presents the ping round-trip-time statistics."; } } Appendix B. Appendix A.2 Example of new retrieval procedures Model As discussed in introduction section of this document, the new retrieval procedures can be defined for retrieval of the same data defined by base YANG Data model for connectionless OAM protocols. This appendix demonstrates how the base connectionless OAM data model can be extended to support persistent data retrieval besides on demand retrieval procedures defined in section 3,i.e.,first retrieve persistent-id based on destination test point location information and then retrieve export details based on persistent-id. Internet Protocol Flow Information Export (IPFIX) [RFC7011] or YANG-push [I-D.ietf-netconf-yang-push]. are currently outlined here as data export options and more can be added in future. The YANG module "example-cl-oam-persistent-methods" shown below is intended as an illustration rather than a real definition of a RPC operation model for persistent data retrieval. For the sake of brevity, this module does not obey all the guidelines specified in [RFC6087]. module example-cl-oam-persistent-methods { namespace "http://example.com/cl-oam-persistent-methods"; prefix pcloam-methods; import ietf-interfaces { prefix if; Kumar, et al. Expires April 27, 2018 [Page 25] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 } import ietf-connectionless-oam { prefix cl-oam; } import ietf-yang-types { prefix yang; } identity export-method { description "Base identity to represent a conceptual export-method."; } identity ipfix-export { base export-method; description "IPFIX based export. Configuration provided separately."; } identity yang-push-export { base export-method; description "Yang-push from draft-ietf-netconf-yang-push"; } identity protocol-id { description "A generic protocol identifier."; } identity status-code { description "Base status code"; } identity invalid-cc { base status-code; description "Indicates that the Continuity check message is invalid"; } identity invalid-pd { base status-code; description "Indicates that the path discovery message is invalid"; } identity status-sub-code { description "Base status sub code"; } typedef export-method { type identityref { Kumar, et al. Expires April 27, 2018 [Page 26] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 base export-method; } description "Export method type."; } typedef change-type { type enumeration { enum "create" { description "Change due to a create."; } enum "delete" { description "Change due to a delete."; } enum "modify" { description "Change due to an update."; } } description "Different types of changes that may occur."; } rpc cc-get-persistent-id { if-feature "cl-oam:continuity-check"; description "Obtains continuity-check persistent identification given mapping parameters as input."; input { container destination-tp { uses cl-oam:tp-address; description "Destination test point."; } uses cl-oam:session-type; leaf source-interface { type if:interface-ref; description "Source interface."; } leaf outbound-interface { type if:interface-ref; description "Outbound interface."; } leaf vrf { type cl-oam:routing-instance-ref; Kumar, et al. Expires April 27, 2018 [Page 27] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 description "VRF instance."; } } output { container error-code { leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code."; } leaf status-sub-code { type identityref{ base status-sub-code; } mandatory true; description "Sub code for CC."; } description "Error code and Sub Code."; } leaf cc-persistent-id { type string; description Kumar, et al. Expires April 27, 2018 [Page 28] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 "Id to act as a cookie."; } } } rpc cc-persistent-get-export-details { if-feature "cl-oam:continuity-check"; description "Given the persistent id, gets the configuration options, details related to the configured data export."; input { leaf cc-persistent-id { type string; description "Persistent Id for use as a key in search."; } } output { container error-code { leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code."; } leaf status-sub-code { Kumar, et al. Expires April 27, 2018 [Page 29] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 type identityref{ base status-sub-code; } mandatory true; description "Sub code for CC."; } description "Error code and Sub Code."; } leaf data-export-method { type export-method; description "Type of export in use."; } choice cc-trigger { description "Necessary conditions for periodic or on-change trigger."; case periodic { description "Periodic reports."; leaf period { type yang:timeticks; description "Time interval between reports."; } leaf start-time { type yang:date-and-time; description "Timestamp from which reports were started."; } } case on-change { description "On-change trigger and not periodic."; leaf all-data-on-start { type boolean; description "Full update done on start or not."; } leaf-list excluded-change { type change-type; description "Changes that will not trigger an update."; } Kumar, et al. Expires April 27, 2018 [Page 30] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 } } } } rpc pd-get-persistent-id { if-feature "cl-oam:path-discovery"; description "Obtains persistent path discovery identification."; input { container destination-tp { uses cl-oam:tp-address; description "Destination test point."; } uses cl-oam:session-type; leaf source-interface { type if:interface-ref; description "Source interface."; } leaf outbound-interface { type if:interface-ref; description "Outbound interface."; } leaf vrf { type cl-oam:routing-instance-ref; description "VRF"; } } output { list response-list { key "response-index"; description "Path discovery response list."; leaf response-index { type uint32; mandatory true; description "Response index."; } leaf protocol-id { type identityref { base protocol-id; } Kumar, et al. Expires April 27, 2018 [Page 31] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 mandatory true; description "Protocol used. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref { base status-code; } mandatory true; description "Error code for Persistent Path Discovery Information. "; } leaf status-sub-code { type identityref{ base status-sub-code; } mandatory true; description "Sub code for Persistent Path Discovery Information. "; } leaf pd-persistent-id { type string; description "Id to act as a cookie."; } } } } rpc pd-persistent-get-export-details { if-feature "cl-oam:path-discovery"; description "Given the persistent id, gets the configuration options, details related to the configured data export."; input { leaf cc-persistent-id { Kumar, et al. Expires April 27, 2018 [Page 32] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 type string; description "Persistent Id for use as a key in search."; } } output { list response-list { key "response-index"; description "Path discovery response list."; leaf response-index { type uint32; mandatory true; description "Response index."; } leaf protocol-id { type identityref { base protocol-id; } mandatory true; description "Protocol used. This could be a standard protocol (e.g., TCP/IP protocols, MPLS etc.,) or a proprietary protocol as identified by this field."; } leaf protocol-id-meta-data { type uint64; description "An optional meta-data related to the protocol ID. For e.g., this could be the Internet Protocol number for standard Internet Protocols for help in protocol processing."; } leaf status-code { type identityref{ base status-code; } mandatory true; description "Error code for Persistent Path Discovery Creation. "; } leaf status-sub-code { type identityref{ base status-sub-code; } Kumar, et al. Expires April 27, 2018 [Page 33] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 mandatory true; description "Sub code for Persistent Path Discovery Creation. "; } leaf data-export-method { type export-method; description "Type of export."; } choice pd-trigger { description "Necessary conditions for periodic or on-change trigger."; case periodic { description "Periodic reports."; leaf period { type yang:timeticks; description "Time interval between reports."; } leaf start-time { type yang:date-and-time; description "Timestamp from which reports are started."; } } case on-change { description "On-change trigger and not periodic."; leaf all-data-on-start { type boolean; description "Full update done on start or not."; } leaf-list excluded-change { type change-type; description "Changes that will not trigger an update."; } } } } } } } Kumar, et al. Expires April 27, 2018 [Page 34] Internet-Draft Retrieval Methods CL OAM YANG model October 2017 Authors' Addresses Deepak Kumar CISCO Systems 510 McCarthy Blvd Milpitas, CA 95035 USA Email: dekumar@cisco.com Michael Wang Huawei Technologies,Co.,Ltd 101 Software Avenue, Yuhua District Nanjing 210012 China Email: wangzitao@huawei.com Qin Wu Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China Email: bill.wu@huawei.com Reshad Rahman CISCO Systems 2000 Innovation Drive Kanata, Ontario K2K 3E8 Canada Email: rrahman@cisco.com Srihari Raghavan CISCO Systems Tril Infopark Sez, Ramanujan IT City Neville Block, 2nd floor, Old Mahabalipuram Road Chennai, Tamil Nadu 600113 India Email: srihari@cisco.com Kumar, et al. Expires April 27, 2018 [Page 35]