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


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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
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   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].








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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.





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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









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