Interface to the Routing System (I2RS) Ephemeral State Requirements
RFC 8242

Document Type RFC - Informational (September 2017; No errata)
Last updated 2017-09-15
Replaces draft-haas-i2rs-ephemeral-state-reqs
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Internet Engineering Task Force (IETF)                           J. Haas
Request for Comments: 8242                                       Juniper
Category: Informational                                         S. Hares
ISSN: 2070-1721                                                   Huawei
                                                          September 2017

  Interface to the Routing System (I2RS) Ephemeral State Requirements

Abstract

   "An Architecture for the Interface to the Routing System" (RFC 7921)
   abstractly describes a number of requirements for ephemeral state (in
   terms of capabilities and behaviors) that any protocol suite
   attempting to meet the needs of the Interface to the Routing System
   (I2RS) protocol has to provide.  This document describes, in detail,
   requirements for ephemeral state for those implementing the I2RS
   protocol.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8242.

Haas & Hares                  Informational                     [Page 1]
RFC 8242            I2RS Ephemeral State Requirements     September 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 ....................................................3
      1.1. Requirements Language ......................................4
   2. Architectural Requirements for Ephemeral State ..................4
   3. Ephemeral State Requirements ....................................5
      3.1. Persistence ................................................5
      3.2. Constraints ................................................6
      3.3. Hierarchy ..................................................6
      3.4. Ephemeral Configuration Overlapping Local Configuration ....6
   4. YANG Features for Ephemeral State ...............................7
   5. NETCONF Features for Ephemeral State ............................7
   6. RESTCONF Features for Ephemeral State ...........................7
   7. Requirements regarding Supporting Multi-Head Control via
      Client ..........................................................7
   8. Multiple Message Transactions ...................................9
   9. Pub/Sub Requirements Expanded for Ephemeral State ...............9
   10. IANA Considerations ...........................................10
   11. Security Considerations .......................................10
   12. Normative References ..........................................10
   Acknowledgements ..................................................12
   Authors' Addresses ................................................12

Haas & Hares                  Informational                     [Page 2]
RFC 8242            I2RS Ephemeral State Requirements     September 2017

1.  Introduction

   The Interface to the Routing System (I2RS) Working Group (WG) is
   chartered with providing architecture and mechanisms to inject into
   and retrieve information from the routing system.  The I2RS
   Architecture document [RFC7921] abstractly documents a number of
   requirements for implementing the I2RS and defines ephemeral state as
   "state that does not survive the reboot of a routing device or the
   reboot of the software handling the I2RS software on a routing
   device" (see Section 1.1 of [RFC7921]).  Section 2 of this document
   describes the specific requirements that the I2RS WG has identified
   based on the I2RS architecture's abstract requirements.  The
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