Extended BGP Administrative Shutdown Communication
RFC 9003

Document Type RFC - Proposed Standard (January 2021; No errata)
Obsoletes RFC 8203
Updates RFC 4486
Authors Job Snijders  , Jakob Heitz  , John Scudder  , Alexander Azimov 
Last updated 2021-01-08
Replaces draft-snijders-idr-rfc8203bis
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Document shepherd Susan Hares
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Send notices to Susan Hares <shares@ndzh.com>, aretana.ietf@gmail.com
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                       J. Snijders
Request for Comments: 9003                                           NTT
Obsoletes: 8203                                                 J. Heitz
Updates: 4486                                                      Cisco
Category: Standards Track                                     J. Scudder
ISSN: 2070-1721                                                  Juniper
                                                               A. Azimov
                                                                  Yandex
                                                            January 2021

           Extended BGP Administrative Shutdown Communication

Abstract

   This document enhances the BGP Cease NOTIFICATION message
   "Administrative Shutdown" and "Administrative Reset" subcodes for
   operators to transmit a short free-form message to describe why a BGP
   session was shut down or reset.  This document updates RFC 4486 and
   obsoletes RFC 8203 by defining an Extended BGP Administrative
   Shutdown Communication of up to 255 octets to improve communication
   using multibyte character sets.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc9003.

Copyright Notice

   Copyright (c) 2021 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
     1.1.  Requirements Language
   2.  Shutdown Communication
   3.  Operational Considerations
   4.  Error Handling
   5.  IANA Considerations
   6.  Security Considerations
   7.  References
     7.1.  Normative References
     7.2.  Informative References
   Appendix A.  Changes to RFC 8203
   Acknowledgements
   Authors' Addresses

1.  Introduction

   It can be troublesome for an operator to correlate a BGP-4 [RFC4271]
   session teardown in the network with a notice that was transmitted
   via offline methods, such as email or telephone calls.  This document
   updates [RFC4486] by specifying a mechanism to transmit a short free-
   form UTF-8 [RFC3629] message as part of a Cease NOTIFICATION message
   [RFC4271] to inform the peer why the BGP session is being shut down
   or reset.  This document obsoletes [RFC8203]; the specific
   differences and rationale are discussed in detail in Appendix A.

1.1.  Requirements Language

   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 described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  Shutdown Communication

   If a BGP speaker decides to terminate its session with a BGP
   neighbor, and it sends a NOTIFICATION message with the Error Code
   "Cease" and Error Subcode "Administrative Shutdown" or
   "Administrative Reset" [RFC4486], it MAY include a UTF-8-encoded
   string.  The contents of the string are at the operator's discretion.

   The Cease NOTIFICATION message with a Shutdown Communication is
   encoded as below:

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Error Code 6  |    Subcode    |    Length     |     ...       \
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+               /
   \                                                               \
   /                 ... Shutdown Communication ...                /
   \                                                               \
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                  Figure 1

   Subcode:  The Error Subcode value MUST be one of the following
      values: 2 ("Administrative Shutdown") or 4 ("Administrative
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