Improving the Reaction of Customer Edge Routers to Renumbering Events
draft-ietf-v6ops-cpe-slaac-renum-04

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IPv6 Operations Working Group (v6ops)                            F. Gont
Internet-Draft                                              SI6 Networks
Updates: 7084 (if approved)                                      J. Zorz
Intended status: Informational                                  6connect
Expires: February 26, 2021                                  R. Patterson
                                                                  Sky UK
                                                                 B. Volz
                                                                   Cisco
                                                         August 25, 2020

 Improving the Reaction of Customer Edge Routers to Renumbering Events
                  draft-ietf-v6ops-cpe-slaac-renum-04

Abstract

   In scenarios where network configuration information becomes invalid
   without any explicit signaling of that condition (such as when a
   Customer Edge Router crashes and reboots without knowledge of the
   previously-employed configuration information), hosts on the local
   network will continue using stale network configuration information
   for an unacceptably long period of time, thus resulting in
   connectivity problems.  This document specifies improvements to
   Customer Edge Routers that help mitigate the aforementioned problem
   for typical residential and small office scenarios.  This document
   updates RFC7084.

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
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   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 February 26, 2021.

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Copyright Notice

   Copyright (c) 2020 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Improved Customer Edge Router Behavior  . . . . . . . . . . .   3
     3.1.  Interface Between WAN-side and LAN-side . . . . . . . . .   4
     3.2.  LAN-side Option Lifetimes . . . . . . . . . . . . . . . .   5
     3.3.  Signaling Stale Configuration Information . . . . . . . .   6
   4.  Recommended Option Lifetimes Configuration Values . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   In scenarios where network configuration information becomes invalid
   without any explicit signaling of that condition, nodes on the local
   network will continue using stale information for an unacceptably
   long period of time, thus resulting in connectivity problems.  This
   problem is documented in detail in [I-D.ietf-v6ops-slaac-renum].

   This document specifies improvements to Customer Edge (CE) Routers
   that help mitigate the aforementioned problem for residential and
   small office scenarios.  It specifies recommendations for the default
   behavior of CE Routers, and does not preclude the availability of
   configuration knobs that might allow an operator or user to manually-
   configure the CE Router to deviate from these recommendations.  This
   document updates RFC7084.

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