Using GAL as a VCCV Channel Indicator
draft-ietf-pals-vccv-for-gal-03

The information below is for an old version of the document
Document Type Active Internet-Draft (pals WG)
Last updated 2015-05-18 (latest revision 2015-03-06)
Replaces draft-ietf-pwe3-vccv-for-gal
Stream IETF
Intended RFC status Proposed Standard
Formats pdf htmlized bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Matthew Bocci
Shepherd write-up Show (last changed 2015-03-21)
IESG IESG state AD Evaluation
Consensus Boilerplate Unknown
Telechat date
Responsible AD Deborah Brungard
Send notices to matthew.bocci@alcatel-lucent.com, draft-ietf-pals-vccv-for-gal@ietf.org, draft-ietf-pals-vccv-for-gal.ad@ietf.org, draft-ietf-pals-vccv-for-gal.shepherd@ietf.org, pals-chairs@ietf.org
PWE3                                                           T. Nadeau
Internet-Draft                                               lucidvision
Intended status: Standards Track                              L. Martini
Expires: September 7, 2015                                     S. Bryant
                                                           Cisco Systems
                                                           March 6, 2015

                 Using GAL as a VCCV Channel Indicator
                    draft-ietf-pals-vccv-for-gal-03

Abstract

   This document specifies a new Virtual Circuit Connectivity
   Verification (VCCV) (RFC5085) control channel type for use with
   pseudowires (PW) carried over an MPLS network.  This new channel type
   uses the Generic Associated Channel Label (GAL) (RFC5586) to
   distinguish VCCV packets from packets carrying user data.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 7, 2015.

Copyright Notice

   Copyright (c) 2015 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

Nadeau, et al.          Expires September 7, 2015               [Page 1]
Internet-Draft            GAL as a VCCV Channel               March 2015

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  GAL VCCV Control Channel Type . . . . . . . . . . . . . . . .   3
   4.  FAT PWs . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Multi-Segment Pseudowires . . . . . . . . . . . . . . . . . .   5
   6.  VCCV Capability Advertisement . . . . . . . . . . . . . . . .   5
   7.  Manageability Considerations  . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  MPLS VCCV Control Channel (CC) Type 4 . . . . . . . . . .   6
     9.2.  LDP Status Code . . . . . . . . . . . . . . . . . . . . .   6
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     11.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   This document specifies a new Virtual Circuit Connectivity
   Verification (VCCV) [RFC5085] control channel (CC) type for use with
   pseudowires (PW) carried over an MPLS network that do not use the PW
   Control Word (CW) [RFC4385].  This new VCCV CC type uses the Generic
   Associated Channel Label (GAL) [RFC5586] to distinguish VCCV packets
   from packets carrying user data.  This new VCCV CC type introduces
   compatibility with the method of MPLS Label Switched Path (LSP)
   Operations, Administration, and Maintenance (OAM) identification,
   particularly in MPLS-TP networks [RFC5921].

   VCCV currently specifies three CC types.  VCCV CC Type 1 uses the PW
   Control Word (CW) to distinguish VCCV packets from packets carrying
   user data.  VCCV CC Types 2 and 3 require IP encapsulation for OAM
   packets they carry.  This was not an issue when [RFC5085] was
   designed, but is in conflict with the design goals of MPLS Transport
   Profile (MPLS-TP) [RFC5921] which does not otherwise require the
   availability of IP.  VCCV CC Type 2 is not applicable to multi-
   segment PWs (MS-PWs) [RFC6073].  A MS-PW operating without the CW
   therefore has to use VCCV CC Type 3 which identifies VCCV packets on
   the basis of Time to Live (TTL) expiry.  Whilst less of an issue with
   a single segment PW (SS-PW), on an MS-PW this need to be accurately
Show full document text