MAC Address for Layer 3 Link Local Discovery Protocol (LLDP)
draft-eastlake-lldp-mac-00

Document Type Active Internet-Draft (individual)
Author Donald Eastlake 
Last updated 2020-05-14
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INTERNET-DRAFT                                               D. Eastlake
Intended Status: Proposed Standard                Futurewei Technologies
Expires: November 13, 2020                                  May 14, 2020

      MAC Address for Layer 3 Link Local Discovery Protocol (LLDP)
                    <draft-eastlake-lldp-mac-00.txt>

Abstract

   IEEE 802 has defined a number of protocols which operate between
   adjacent Ethernet stations at Layer 2, including bridges, such as the
   Link Layer Discover Protocol (IEEE 802.1AB, LLDP). LLDP and other
   such protocols may be useful between Layer 3 aware stations such as
   IP routers and hosts. This document specifies a MAC address that can
   be used for this purpose despite intervening bridges.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Distribution of this document is unlimited. Comments should be sent
   to the authors.

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D. Eastlake                                                     [Page 1]
INTERNET-DRAFT                                       L3 LLDP MAC Address

Table of Contents

      1. Introduction............................................3
      1.1 Notations Used in This Document........................3

      2. Network Layers and MAC Addresses........................4

      3. IANA Considerations.....................................6
      4. Security Considerations.................................7

      5. Acknowledgements........................................7

      Normative References.......................................8
      Informative References.....................................8

      Appendix A: EUI-48 Assignment Request.....................10

D. Eastlake                                                     [Page 2]
INTERNET-DRAFT                                       L3 LLDP MAC Address

1. Introduction

   IEEE 802 [IEEE802] has defined a number of protocols which operate
   between adjacent Ethernet stations at Layer 2, including bridges,
   such as the Link Layer Discover Protocol ([802.1AB] LLDP) and the
   Link Aggregation Control Protocol ([802.1AX] LACP). LLDP and other
   such protocols may be useful between adjacent Layer 3 [ISO] aware
   stations such as IP routers and hosts. This document specifies a MAC
   address that can be used for that purpose despite intervening
   bridges.

1.1 Notations Used in This Document

   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.

   In this document the terms/acronyms listed below have the indicated
   meaning:

   "LACP"   Link Aggregation Control Protocol [802.1AX].

   "Layer 2"  Layer 2 in the ISO model [ISO].

   "Layer 3"  Layer 3 in the ISO model [ISO].

   "LLDP"   Link Layer Discovery Protocol [802.1AB].

   "MAC"    Media Access Control [RFC7042bis] (not Message
            Authentication Code).

   PDU      Protocol Data Unit.

D. Eastlake                                                     [Page 3]
INTERNET-DRAFT                                       L3 LLDP MAC Address

2. Network Layers and MAC Addresses

   LLDP [802.1AB] is a Layer 2 [ISO] protocol providing for the
   unacknowledged announcement of information by an Ethernet station to
   other stations on the same Ethernet link.  There are proposals for
   the use of LLDP between L3 aware stations such as between a host and
   its first hop IP router or between IP adjacent routers. Examples are
   [LLDP1] [LLDP2] [LLDP3]. In addition, project [802.1ABdh] is underway
   in [IEEE802] that may extend the LLDP standard so that stations can
   announce a larger amount of information.

   As illustrated in the figure below, uses of LLDP and similar
   protocols between Ethernet stations have a scope of adjacency
   controlled by the multicast destination MAC address [RFC7042bis] of
   the Ethernet frame used to transmit the LLDP PDU.

    - Customer bridges use 0x0180C2000000 for LLDP and the like. Frames
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