PPP Transparent Interconnection of Lots of Links (TRILL) Protocol Control Protocol
RFC 6361

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Internet Engineering Task Force (IETF)                        J. Carlson
Request for Comments: 6361                                   WorkingCode
Category: Standards Track                                D. Eastlake 3rd
ISSN: 2070-1721                                                   Huawei
                                                             August 2011

   PPP Transparent Interconnection of Lots of Links (TRILL) Protocol
                            Control Protocol

Abstract

   The Point-to-Point Protocol (PPP) defines a Link Control Protocol
   (LCP) and a method for negotiating the use of multiprotocol traffic
   over point-to-point links.  This document describes PPP support for
   the Transparent Interconnection of Lots of Links (TRILL) Protocol,
   allowing direct communication between Routing Bridges (RBridges) via
   PPP links.

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 5741.

   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/rfc6361.

Copyright Notice

   Copyright (c) 2011 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
   (http://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.

Carlson & Eastlake           Standards Track                    [Page 1]
RFC 6361                     TRILL over PPP                  August 2011

Table of Contents

   1. Introduction ....................................................2
   2. PPP TRILL Negotiation ...........................................3
      2.1. TNCP Packet Format .........................................3
      2.2. TNP Packet Format ..........................................4
      2.3. TLSP Packet Format .........................................5
   3. TRILL PPP Behavior ..............................................5
   4. Security Considerations .........................................6
   5. IANA Considerations .............................................6
   6. References ......................................................7
      6.1. Normative References .......................................7
      6.2. Informative References .....................................7
   7. Acknowledgements ................................................8

1.  Introduction

   The TRILL Protocol [RFC6325] defines a set of mechanisms used to
   communicate between RBridges.  These devices can bridge together
   large 802 networks using link-state protocols in place of the
   traditional spanning tree mechanisms [RFC5556].

   Over Ethernet, TRILL uses two separate Ethertypes to distinguish
   between encapsulation headers, which carry user data, and link-state
   messages, which compute network topology using a protocol based on
   [IS-IS] [RFC6326].  These two protocols must be distinguished from
   one another, and segregated from all other traffic.

   In a network where PPP [RFC1661] is used to interconnect routers
   (often over telecommunications links), it may be advantageous to be
   able to bridge between Ethernet segments over those PPP links, and
   thus integrate remote networks with an existing TRILL cloud.  The
   existing Bridging Control Protocol (BCP) [RFC3518] allows direct
   bridging of Ethernet frames over PPP.  However, this mechanism is
   inefficient and inadequate for TRILL, which can be optimized for use
   over PPP links.

   To interconnect these devices over PPP links, three protocol numbers
   are needed, and are reserved as follows:

      Value (in hex)  Protocol Name
      --------------  -------------------------------------
       005d           TRILL Network Protocol (TNP)
       405d           TRILL Link State Protocol (TLSP)
       805d           TRILL Network Control Protocol (TNCP)

   The usage of these three protocols is described in detail in the
   following section.

Carlson & Eastlake           Standards Track                    [Page 2]
RFC 6361                     TRILL over PPP                  August 2011

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",