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Layer 2 Tunneling Protocol Version 3 (L2TPv3) Extended Circuit Status Values
RFC 5641

Network Working Group                                          N. McGill
Request for Comments: 5641                                  C. Pignataro
Updates: 3931, 4349, 4454, 4591, 4719                      Cisco Systems
Category: Standards Track                                    August 2009

             Layer 2 Tunneling Protocol Version 3 (L2TPv3)
                     Extended Circuit Status Values

Abstract

   This document defines additional Layer 2 Tunneling Protocol Version 3
   (L2TPv3) bit values to be used within the "Circuit Status" Attribute
   Value Pair (AVP) to communicate finer-grained error states for
   Attachment Circuits (ACs) and pseudowires (PWs).  It also generalizes
   the Active bit and deprecates the use of the New bit in the Circuit
   Status AVP, updating RFC 3931, RFC 4349, RFC 4454, RFC 4591, and RFC
   4719.

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 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 in effect on the date of
   publication of this document (http://trustee.ietf.org/license-info).
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

McGill & Pignataro          Standards Track                     [Page 1]
RFC 5641         L2TPv3 Extended Circuit Status Values       August 2009

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
     1.1.  Specification of Requirements  . . . . . . . . . . . . . .  2
     1.2.  Abbreviations  . . . . . . . . . . . . . . . . . . . . . .  3
   2.  L2TPv3 Extended Circuit Status Values  . . . . . . . . . . . .  3
   3.  Circuit Status Usage and Clarifications  . . . . . . . . . . .  7
   4.  Updates to Existing RFCs . . . . . . . . . . . . . . . . . . .  8
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     8.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 10

1.  Introduction

   Currently, the L2TPv3 Circuit Status AVP [RFC3931] is able to convey
   the UP/DOWN status of an access circuit.  However, a finer
   granularity is often useful to determine the direction of the fault,
   as has been added for MPLS-based pseudowires and is used in the
   pseudowire control protocol using the Label Distribution Protocol
   (LDP); see Section 3.5 of [RFC4446] and Section 5.4.2 of [RFC4447].

   Additionally, it is useful (in session-level redundancy scenarios) to
   be able to indicate if a pseudowire is in a standby state, where it
   is fully established by signaling and allows Operations,
   Administration, and Maintenance, but is not switching data.  Again,
   such functionality is available for MPLS-based pseudowires using LDP,
   see [PREF-FWD].

   This document provides extended circuit status bit values for L2TPv3
   and adds them in a manner such that it is backwards compatible with
   the current Circuit Status AVP.  These new bits are applicable to all
   pseudowire types that use the Circuit Status AVP.

1.1.  Specification of Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

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