Network Working Group V. Rajaguru, Ed. Internet-Draft Cisco Systems Intended status: Standards Track 15 August 2022 Expires: 16 February 2023 YANG Data Model for Bidirectional Forwarding Detection (BFD) Hardware Offloaded Session draft-rvelucha-bfd-offload-yang-03 Abstract This document defines a extension YANG data model that can be used to manage Hardware Offloaded Bidirectional Forwarding Detection (BFD). This document specially talks about BFD sessions that are offloaded to hardware. The YANG modules in this document conform to the Network Management Datastore Architecture (NMDA). 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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Code Components Rajaguru Expires 16 February 2023 [Page 1] Internet-Draft BFD YANG August 2022 extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 2 1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 2 2. Design of the Data Model . . . . . . . . . . . . . . . . . . 3 3. BFD IP single-hop-ext hierarchy . . . . . . . . . . . . . . . 3 4. BFD IP multi-hop-ext hierarchy . . . . . . . . . . . . . . . 3 5. BFD Over LAG-ext hierarchy . . . . . . . . . . . . . . . . . 4 6. BFD IP single-hop ext YANG Module . . . . . . . . . . . . . . 4 7. BFD IP multi-hop ext YANG Module . . . . . . . . . . . . . . 6 8. BFD Over LAG ext YANG Module . . . . . . . . . . . . . . . . 8 9. Security Considerations . . . . . . . . . . . . . . . . . . . 9 10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9 11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9 12. Normative References . . . . . . . . . . . . . . . . . . . . 10 Appendix A. Change log . . . . . . . . . . . . . . . . . . . . . 10 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction This document defines an extension YANG data model to base model [RFC9127] that can be used to manage BFD sessions that are offloaded to hardware. BFD is a network protocol which is used for liveness detection of arbitrary paths between systems. 1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 1.2. Tree Diagrams This document uses the graphical representation of data models defined in [RFC8340]. Rajaguru Expires 16 February 2023 [Page 2] Internet-Draft BFD YANG August 2022 2. Design of the Data Model This yang model which is extension to base BFD yang mode been designed to manage BFD HW offloaded sessions. This new "bfd" container is augmented by all the YANG modules for their respective specific information: 1. ietf-bfd-ip-sh-ext.yang augments "/routing/control-plane- protocols/control-plane-protocol/bfd/ip-sh/sessions/session" with the "session-offloaded" leaf for BFD sessions over IP single-hop extension. 2. ietf-bfd-ip-mh-ext.yang augments "/routing/control-plane- protocols/control-plane-protocol/bfd/ip-mh/sessions-groups/ session-group" with the "session-offloaded" leaf for BFD sessions over IP multi-hop extension. 3. ietf-bfd-lag-ext.yang augments "/routing/control-plane-protocols/ control-plane-protocol/bfd/bfd-lag/sessions/session" with the "ession-offloaded" leaf for BFD sessions over LAG extension. 3. BFD IP single-hop-ext hierarchy An "ip-sh-ext" node is added under "bfd" node in control-plane- protocol. The operational state data for each BFD IP single-hop session is under this "ip-sh-ext" node. module: ietf-bfd-ip-sh-ext augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/bfd:bfd/bfd-ip-sh:ip-sh /bfd-ip-sh:sessions/bfd-ip-sh:session: +--rw ip-sh-ext +--ro session-running-ext +--ro session-offloaded? boolean 4. BFD IP multi-hop-ext hierarchy An "ip-mh-ext" node is added under "bfd" node in control-plane- protocol. The operational state data for each BFD IP multi-hop session is under this "ip-mh-ext" node. Rajaguru Expires 16 February 2023 [Page 3] Internet-Draft BFD YANG August 2022 module: ietf-bfd-ip-mh-ext augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/bfd:bfd/bfd-ip-mh:ip-mh /bfd-ip-mh:session-groups/bfd-ip-mh:session-group: +rw session-offloaded? boolean 5. BFD Over LAG-ext hierarchy An "lag-ext" node is added under "bfd" node in control-plane- protocol. The operational state data for each BFD Over LAG session is under this "lag-ext" node. module: ietf-bfd-lag-ext augment /rt:routing/rt:control-plane-protocols /rt:control-plane-protocol/bfd:bfd/bfd-lag:lag /bfd-lag:sessions/bfd-lag:session: +rw session-offloaded? boolean 6. BFD IP single-hop ext YANG Module This YANG module imports "ietf-bfd-ip-sh" from RFC9127 and augments. file "ietf-bfd-ip-sh-ext@2022-02-22.yang" module ietf-bfd-ip-sh-ext { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-bfd-ip-sh-ext"; prefix "bfd-ip-sh-ext"; import ietf-bfd { prefix "bfd"; reference "RFC 9127: A YANG Data Model for Bidirectional Forwarding Detection (BFD)"; } import ietf-routing { prefix "rt"; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA version)"; } import ietf-bfd-ip-sh { Rajaguru Expires 16 February 2023 [Page 4] Internet-Draft BFD YANG August 2022 prefix "bfd-ip-sh"; reference "RFC 9127: A YANG Data Model for Bidirectional Forwarding Detection (BFD)"; } organization "IETF BFD Working Group"; contact "WG Web: WG List: Editors: Rajaguru Veluchamy (rvelucha@cisco.com)"; description "This module contains the YANG definition for BFD IP single-hop as per RFC 5881 with some extended info. Copyright (c) 2018 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 Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; reference "RFC 5881: Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop) RFC 9127: YANG Data Model for Bidirectional Forwarding Detection (BFD)"; revision 2022-02-18 { description "Initial revision."; reference "RFC XXXX: A YANG data model for BFD IP single-hop extension"; } /* * Augments */ augment "/rt:routing/rt:control-plane-protocols/" + "rt:control-plane-protocol/bfd:bfd/bfd-ip-sh:ip-sh/" + "bfd-ip-sh:sessions/bfd-ip-sh:session" { Rajaguru Expires 16 February 2023 [Page 5] Internet-Draft BFD YANG August 2022 description "BFD augmentation for IP single-hop-ext"; leaf session-offloaded { type boolean; description "Indicates whether BFD session is running in hardware"; } } } 7. BFD IP multi-hop ext YANG Module This YANG module imports "ietf-bfd-ip-mh" from RFC9127 and augments. file "ietf-bfd-ip-mh-ext@2022-02-22.yang" module ietf-bfd-ip-mh-ext { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-bfd-ip-mh-ext"; prefix "bfd-ip-mh-ext"; import ietf-bfd { prefix "bfd"; reference "RFC 9127: A YANG Data Model for Bidirectional Forwarding Detection (BFD)"; } import ietf-routing { prefix "rt"; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA version)"; } import ietf-bfd-ip-mh { prefix "bfd-ip-mh"; reference "RFC 9127: A YANG Data Model for Bidirectional Forwarding Detection (BFD)"; } organization "IETF BFD Working Group"; contact "WG Web: WG List: Editors: Rajaguru Veluchamy (rvelucha@cisco.com)"; Rajaguru Expires 16 February 2023 [Page 6] Internet-Draft BFD YANG August 2022 description "This module contains the YANG definition for BFD IP single-hop as per RFC 5881 with some extended info. Copyright (c) 2018 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 Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; reference "RFC 5881: Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop) RFC 9127: YANG Data Model for Bidirectional Forwarding Detection (BFD)"; revision 2022-02-18 { description "Initial revision."; reference "RFC XXXX: A YANG data model for BFD IP single-hop extension"; } /* * Augments */ augment "/rt:routing/rt:control-plane-protocols/" + "rt:control-plane-protocol/bfd:bfd/bfd-ip-mh:ip-mh/" + "bfd-ip-mh:session-groups/bfd-ip-mh:session-group" { description "BFD augmentation for IP multi-hop-ext"; leaf session-offloaded { type boolean; description "Indicates whether BFD session is running in hardware"; } } } Rajaguru Expires 16 February 2023 [Page 7] Internet-Draft BFD YANG August 2022 8. BFD Over LAG ext YANG Module This YANG module imports "ietf-bfd-lag" from RFC9127 and augments. file "ietf-bfd-lag-ext@2022-02-22.yang" module ietf-bfd-lag-ext { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-bfd-lag-ext"; prefix "bfd-lag-ext"; import ietf-bfd { prefix "bfd"; reference "RFC 9127: A YANG Data Model for Bidirectional Forwarding Detection (BFD)"; } import ietf-routing { prefix "rt"; reference "RFC 8349: A YANG Data Model for Routing Management (NMDA version)"; } import ietf-bfd-lag { prefix "bfd-lag"; reference "RFC 9127: A YANG Data Model for Bidirectional Forwarding Detection (BFD)"; } organization "IETF BFD Working Group"; contact "WG Web: WG List: Editors: Rajaguru Veluchamy (rvelucha@cisco.com)"; description "This module contains the YANG definition for BFD IP single-hop as per RFC 5881 with some extended info. Copyright (c) 2018 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 Rajaguru Expires 16 February 2023 [Page 8] Internet-Draft BFD YANG August 2022 to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; reference "RFC 5881: Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop) RFC 9127: YANG Data Model for Bidirectional Forwarding Detection (BFD)"; revision 2022-02-18 { description "Initial revision."; reference "RFC XXXX: A YANG data model for BFD IP single-hop extension"; } /* * Augments */ augment "/rt:routing/rt:control-plane-protocols/" + "rt:control-plane-protocol/bfd:bfd/bfd-lag:lag/" + "bfd-lag:sessions/bfd-lag:session" { description "BFD augmentation for LAG ext"; leaf session-offloaded { type boolean; description "Indicates whether BFD session is running in hardware"; } } } 9. Security Considerations TBD. 10. IANA Considerations None. 11. Acknowledgements I would like to thank Vengada Prasad Govindan for his support and guidance on this work. Rajaguru Expires 16 February 2023 [Page 9] Internet-Draft BFD YANG August 2022 12. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010, . [RFC5881] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)", RFC 5881, DOI 10.17487/RFC5881, June 2010, . [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, . [RFC9127] Rahman, R., Ed., Zheng, L., Ed., Jethanandani, M., Ed., Pallagatti, S., and G. Mirsky, "YANG Data Model for Bidirectional Forwarding Detection (BFD)", RFC 9127, DOI 10.17487/RFC9127, October 2021, . Appendix A. Change log RFC Editor: Remove this section upon publication as an RFC. Author's Address Rajaguru Veluchamy (editor) Cisco Systems India Email: rvelucha@cisco.com Rajaguru Expires 16 February 2023 [Page 10]