Transporting Timing messages over MPLS Networks
draft-ietf-tictoc-1588overmpls-04

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Last updated 2013-02-22
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TICTOC Working Group                                           S. Davari
Internet-Draft                                                   A. Oren
Intended status: Standards Track                          Broadcom Corp.
Expires: August 27, 2013                                       M. Bhatia
                                                              P. Roberts
                                                          Alcatel-Lucent
                                                              L. Montini
                                                           Cisco Systems
                                                       February 23, 2013

            Transporting Timing messages over MPLS Networks
                   draft-ietf-tictoc-1588overmpls-04

Abstract

   This document defines the method for transporting Timing messages
   such as PTP and NTP over an MPLS network.  The method allows for the
   easy identification of these PDUs at the port level to allow for port
   level processing of these PDUs in both LERs and LSRs.

   The basic idea is to transport Timing messages inside dedicated MPLS
   LSPs.  These LSPs only carry timing messages and possibly Control and
   Management packets, but they do not carry customer traffic.

   Two methods for transporting Timing messages over MPLS are defined.
   The first method is to transport Timing messages directly over the
   dedicated MPLS LSP via UDP/IP encapsulation, which is suitable for
   MPLS networks.  The second method is to transport Timing messages
   inside a PW via Ethernet encapsulation, which is suitable for both
   MPLS and MPLS-TP networks.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on August 27, 2013.

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Copyright Notice

   Copyright (c) 2013 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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  6

   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  8

   3.  Problem Statement  . . . . . . . . . . . . . . . . . . . . . .  9

   4.  Timing over MPLS Architecture  . . . . . . . . . . . . . . . . 10

   5.  Dedicated LSPs for Timing messages . . . . . . . . . . . . . . 12

   6.  Timing over LSP Encapsulation  . . . . . . . . . . . . . . . . 13
     6.1.  Timing over UDP/IP over MPLS Encapsulation . . . . . . . . 13
     6.2.  Timing over PW Encapsulation . . . . . . . . . . . . . . . 13
     6.3.  Other Timing Encapsulation methods . . . . . . . . . . . . 14

   7.  Timing message Processing  . . . . . . . . . . . . . . . . . . 15

   8.  Protection and Redundancy  . . . . . . . . . . . . . . . . . . 16

   9.  ECMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

   10. PHP  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

   11. Entropy  . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

   12. OAM, Control and Management  . . . . . . . . . . . . . . . . . 20

   13. QoS Considerations . . . . . . . . . . . . . . . . . . . . . . 21

   14. FCS Recalculation  . . . . . . . . . . . . . . . . . . . . . . 22

   15. UDP Checksum Correction  . . . . . . . . . . . . . . . . . . . 23

   16. Routing extensions for Timing-aware Routers  . . . . . . . . . 24

   17. Signaling Extensions for Creating Timing LSPs  . . . . . . . . 25

   18. Behavior of LER/LSR  . . . . . . . . . . . . . . . . . . . . . 26
     18.1. Behavior of Timing-capable/aware LER . . . . . . . . . . . 26
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