Internet Engineering Task Force (IETF)                       J. Snijders
Request for Comments: 8203                                           NTT
Updates: 4486                                                   J. Heitz
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                               J. Scudder
                                                                 Juniper
                                                               July 2017

               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 freeform message to describe why a BGP
   session was shutdown or reset.  This document updates RFC 4486.

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
   http://www.rfc-editor.org/info/rfc8203.

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
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   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
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Shutdown Communication  . . . . . . . . . . . . . . . . . . .   2
   3.  Operational Considerations  . . . . . . . . . . . . . . . . .   3
   4.  Error Handling  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

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
   freeform UTF-8 [RFC3629] message as part of a Cease NOTIFICATION
   message [RFC4271] to inform the peer why the BGP session is being
   shutdown or reset.

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 an 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
      Reset").

   Length:  this 8-bit field represents the length of the Shutdown
      Communication field in octets.  The length value MUST range from 0
      to 128 inclusive.  When the length value is zero, no Shutdown
      Communication field follows.

   Shutdown Communication:  to support international characters, the
      Shutdown Communication field MUST be encoded using UTF-8.  A
      receiving BGP speaker MUST NOT interpret invalid UTF-8 sequences.
      Note that when the Shutdown Communication contains multibyte
      characters, the number of characters will be less than the length
      value.  This field is not NUL terminated.

   Mechanisms concerning the reporting of information contained in the
   Shutdown Communication are implementation specific but SHOULD include
   methods such as Syslog [RFC5424].

3.  Operational Considerations

   Operators are encouraged to use the Shutdown Communication to inform
   their peers of the reason for the shutdown of the BGP session and
   include out-of-band reference materials.  An example of a useful
   Shutdown Communication would be:

   "[TICKET-1-1438367390] software upgrade; back in 2 hours"

   "[TICKET-1-1438367390]" is a ticket reference with significance to
   both the sender and receiver, followed by a brief human-readable
   message regarding the reason for the BGP session shutdown followed by

   an indication about the length of the maintenance.  The receiver can
   now use the string 'TICKET-1-1438367390' to search in their email
   archive to find more details.

4.  Error Handling

   If a Shutdown Communication with an invalid Length value, or an
   invalid UTF-8 sequence is received, a message indicating this event
   SHOULD be logged for the attention of the operator.  An erroneous or
   malformed Shutdown Communication itself MAY be logged in a hexdump
   format.

5.  IANA Considerations

   IANA references this document (in addition to [RFC4486]) for subcodes
   "Administrative Shutdown" (2) and "Administrative Reset" (4) in the
   "Cease NOTIFICATION message subcodes" registry under the "Border
   Gateway Protocol (BGP) Parameters" group.

6.  Security Considerations

   This document uses UTF-8 encoding for the Shutdown Communication.
   There are a number of security issues with Unicode.  Implementers and
   operators are advised to review Unicode Technical Report #36 [UTR36]
   to learn about these issues.  UTF-8 "Shortest Form" encoding is
   REQUIRED to guard against the technical issues outlined in [UTR36].

   As BGP Shutdown Communications are likely to appear in syslog output,
   there is a risk that carefully constructed Shutdown Communication
   might be formatted by receiving systems in a way to make them appear
   as additional syslog messages.  To limit the ability to mount such an
   attack, the BGP Shutdown Communication is limited to 128 octets in
   length.

   Users of this mechanism should be aware that unless a transport that
   provides integrity is used for the BGP session in question, a
   Shutdown Communication message could be forged.  Unless a transport
   that provides confidentiality is used, a Shutdown Communication
   message could be snooped by an attacker.  These issues are common to
   any BGP message but may be of greater interest in the context of this
   proposal since the information carried in the message is generally
   expected to be used for human-to-human communication.  Refer to the
   related considerations in [RFC4271] and [RFC4272].

   Users of this mechanism should consider applying data minimization
   practices as outlined in Section 6.1 of [RFC6973] because a received
   Shutdown Communication may be used at the receiver's discretion.

7.  References

7.1.  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,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC3629]  Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, RFC 3629, DOI 10.17487/RFC3629, November
              2003, <http://www.rfc-editor.org/info/rfc3629>.

   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
              DOI 10.17487/RFC4271, January 2006,
              <http://www.rfc-editor.org/info/rfc4271>.

   [RFC4486]  Chen, E. and V. Gillet, "Subcodes for BGP Cease
              Notification Message", RFC 4486, DOI 10.17487/RFC4486,
              April 2006, <http://www.rfc-editor.org/info/rfc4486>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <http://www.rfc-editor.org/info/rfc8174>.

7.2.  Informative References

   [RFC4272]  Murphy, S., "BGP Security Vulnerabilities Analysis",
              RFC 4272, DOI 10.17487/RFC4272, January 2006,
              <http://www.rfc-editor.org/info/rfc4272>.

   [RFC5424]  Gerhards, R., "The Syslog Protocol", RFC 5424,
              DOI 10.17487/RFC5424, March 2009,
              <http://www.rfc-editor.org/info/rfc5424>.

   [RFC6973]  Cooper, A., Tschofenig, H., Aboba, B., Peterson, J.,
              Morris, J., Hansen, M., and R. Smith, "Privacy
              Considerations for Internet Protocols", RFC 6973,
              DOI 10.17487/RFC6973, July 2013,
              <http://www.rfc-editor.org/info/rfc6973>.

   [UTR36]    Davis, M., Ed. and M. Suignard, Ed., "Unicode Security
              Considerations", Unicode Technical Report #36, August
              2010, <http://unicode.org/reports/tr36/>.

Acknowledgements

   The authors would like to gratefully acknowledge Tom Scholl, David
   Freedman, Jared Mauch, Jeff Haas, Peter Hessler, Bruno Decraene, John
   Heasley, Peter van Dijk, Arjen Zonneveld, James Bensley, Susan Hares,
   Saku Ytti, Lou Berger, Alvaro Retana, and Adam Roach.

   The authors would like to thank Enke Chen and Vincent Gillet for
   their work on [RFC4486] and granting the related rights to the IETF
   Trust per BCP 78.

Authors' Addresses

   Job Snijders
   NTT Communications
   Theodorus Majofskistraat 100
   Amsterdam  1065 SZ
   The Netherlands

   Email: job@ntt.net

   Jakob Heitz
   Cisco
   170 West Tasman Drive
   San Jose, CA  95134
   United States of America

   Email: jheitz@cisco.com

   John Scudder
   Juniper Networks
   1194 N. Mathilda Ave
   Sunnyvale, CA  94089
   United States of America

   Email: jgs@juniper.net