Framework for Service Function Path Control
draft-dunbar-sfc-path-control-00

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SFC working group                                             L. Dunbar
Internet Draft                                                 A. Malis
Intended status: Standard Track                                  Huawei
Expires: April 2015

                                                       October 24, 2014

                Framework for Service Function Path Control
                   draft-dunbar-sfc-path-control-00.txt

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors. All rights reserved.

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Internet-Draft    SF Instances Restoration Framework       October 2014

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Abstract

   This draft describes the framework of protection and restoration of
   Service Function Path when some service functions on the path fail
   or need to be replaced.

Table of Contents

   1. Introduction...................................................3
   2. Conventions used in this document..............................3
   3. Terminology....................................................3
   4. Background.....................................................4
      4.1. Multiple Entities of one Service Function.................4
      4.2. Rendered Service Path (RSP)...............................5
         4.2.1. SFF-sequence and SFF-SF-sequence representation......5
      4.3. Multiple ways of Controlling RSP..........................6
      4.4. Impact of Virtualized Service Functions to SFP............8
   5. Local Restoration of Service Functions.........................8
   6. Global Restoration of Service functions.......................10
      6.1. Encoding the Exact SFF-SF-sequence in Data Packets.......10
      6.2. Dynamic establishment of an RSP..........................11
      6.3. Out-Of-Band Signaling of changes on SFP..................12
      6.4. Hybrid Method............................................12
   7. Regional Restoration of Service Function......................12
   8. Conclusion and Recommendation.................................13
   9. Manageability Considerations..................................13
   10. Security Considerations......................................13
   11. IANA Considerations..........................................13
   12. References...................................................13
      12.1. Normative References....................................13
      12.2. Informative References..................................14
   13. Acknowledgments..............................................14

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Internet-Draft    SF Instances Restoration Framework       October 2014

1. Introduction

   This draft describes the framework for protection and restoration of
   a Service Function Path (SFP) when some functions on the path fail
   or need to be replaced.

   Protection and restoration become more crucial in virtualized
   environments (e.g. ETSI NFV), where service functions are
   instantiated as VMs on servers. There is higher chance of state
   changes for those Service functions as the result of being
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