BGP Provisioned IPsec Transport Mode Protected Tunnel Configuration
draft-hujun-idr-bgp-ipsec-transport-mode-00

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idr                                                                J. Hu
Internet-Draft                                                     Nokia
Intended status: Standards Track                        October 10, 2019
Expires: April 12, 2020

  BGP Provisioned IPsec Transport Mode Protected Tunnel Configuration
              draft-hujun-idr-bgp-ipsec-transport-mode-00

Abstract

   This document defines a method of using BGP to advertise IPsec
   transport mode protected tunnel (like GRE tunnel with IPsec transport
   mode protection) configuration along with NLRI, based on
   [I-D.ietf-idr-tunnel-encaps] and [I-D.hujun-idr-bgp-ipsec].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 12, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  IPsec Transport Protected sub-TLV . . . . . . . . . . . .   3
   2.  Semantics and Operation . . . . . . . . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [I-D.hujun-idr-bgp-ipsec] defines a method of using BGP to advertise
   configuration for IPsec tunnel with ESP tunnel mode, however there
   are other use cases require of using IPsec/ESP transport mode with
   other types of IP tunnel, like GRE tunnel, as defined in [RFC4301]
   and [RFC4303].  Figure 2 shows an example of IPv4 GRE tunnel packet
   with ESP transport mode protection.  This document defines a method
   of using BGP to advertise configuration for these use cases.

                ----------------------------------------------------
                |IPv4 header  | ESP | GRE | Payload |   ESP   | ESP|
                |(any options)| Hdr | Hdr | Packet  | Trailer | ICV|
                ----------------------------------------------------
                                          |<-- encryption --->|
                                    |<-------- integrity ---->|

      Figure 1: IPv4 GRE tunnel packet with ESP transport protection

   The method follows same principle as [I-D.hujun-idr-bgp-ipsec], keep
   changes to BGP minimal and not changing IKEv2/IPsec; however the
   IPsec transport mode protected IP tunnel is not a tunnel stack or
   nested tunnels, IPsec transport mode protection doesn't add extra IP
   header.

   The requirement of using IPsec transport mode is signaled by
   including a sub-TLV: IPsec transport protected, in a BGP tunnel
   encapsulation TLV.

1.1.  Terminology

   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

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

1.2.  IPsec Transport Protected sub-TLV

   This sub-TLV represents using IPsec transport mode protection for the
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