[Search] [txt|pdfized|bibtex] [Tracker] [Email] [Nits]
Versions: 00                                                            
CCAMP WG                                             Huub van Helvoort
Internet Draft                                     Huawei Technologies
Updates: 4427
Intended status: Standards track                         July 11, 2013
Expires: January 2014



                       Update Forced Switch Priority
                  draft-helvoort-ccamp-fs-priority-00.txt


Status of this Memo

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

   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.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

   This Internet-Draft will expire on January 11, 2014.







van Helvoort          Expires January 11, 2014                [Page 1]


Internet-Draft      Update Forced Switch Priority            July 2013


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 to this document.

Abstract

   This document clarifies the definitions related to Manual Switch and
   Forced Switch. This document updates RFC 4427.

Table of Contents


   1. Introduction ................................................ 2
   2. Manual Switch and Forced Switch.............................. 3
   3. Security Considerations ..................................... 3
   4. IANA Considerations ......................................... 3
   5. References .................................................. 4
      5.1. Normative References.................................... 4
      5.2. Informative References.................................. 4
   6. Acknowledgments ............................................. 4

1. Introduction

   The external commands, Manual Switch and Forced Switch, provide an
   operator the ability to control the recovery schemes. The
   definitions in [RFC4427] provide an informative description but do
   not provide enough description to distinguish the processing of
   these commands for usage with priority treatment. The current
   description has led to the open question of how the commands are to
   be processed for relative priority treatment.

   This document provides clarification of the terms relative to
   [G.808.1].








van Helvoort          Expires January 11, 2014                [Page 2]


Internet-Draft      Update Forced Switch Priority            July 2013


2. Manual Switch and Forced Switch

   This section updates [RFC4427]. Section 4.13 of [RFC4427] contains
   the following text regarding the definitions:

   D. Forced switch-over for normal traffic:

      A switch-over action, initiated externally, that switches normal
      traffic to the recovery LSP/span, unless an equal or higher
      priority switch-over command is in effect.

   E. Manual switch-over for normal traffic:

      A switch-over action, initiated externally, that switches normal
      traffic to the recovery LSP/span, unless a fault condition exists
      on other LSPs/spans (including the recovery LSP/span) or an equal
      or higher priority switch-over command is in effect.

   This definition does not provide enough detail with respect to their
   usage relative to priorities. In order to avoid mis-interpretation,
   this document adds the following Note as clarification:

   Note:

      For 1+1 protection schemes (which do not use a communication
      channel), a Forced Switch over for normal traffic will have the
      highest priority, it will not be overridden by a signal fail on
      the protection channel. For other protection schemes (which do use
      a communication channel), a Forced Switch over for normal traffic
      will be overridden if a signal fail is present on the protection
      channel. Definitions of ITU-T terminology in this section are
      intended to aid understanding of the concepts. For the full
      definition of these terms and their use, the reader is referred to
      the appropriate ITU-T Recommendations and RFCs.

3. Security Considerations

   This document clarifies usage of terms defined in [RFC4427]. No new
   information is conveyed; therefore no additional considerations are
   included here.

4. IANA Considerations

   There are no items for IANA to consider.





van Helvoort          Expires January 11, 2014                [Page 3]


Internet-Draft      Update Forced Switch Priority            July 2013


5. References

5.1. Normative References

   [RFC4427] Mannie E. and Papadimitriou D., "Recovery (Protection and
             Restoration) Terminology for Generalized Multi-Protocol
             Label Switching (GMPLS) ", RFC 4427, March 2006.

5.2. Informative References

   [G.808.1] ITU-T Recommendation G.808.1, "Generic protection
             switching - Linear trail and subnetwork protection",
             February 2010.

6. Acknowledgments

   <Add any acknowledgements>

   This document was prepared using 2-Word-v2.0.template.dot.



Authors' Addresses

   Huub van Helvoort

   Huawei Technologies

   Karspeldreef 4

   Amsterdam  1011 CJ

   The Netherlands



   Phone: +31 20 4300832

   Email: Huub.van.Helvoort@huawei.com









van Helvoort          Expires January 11, 2014                [Page 4]