Building blocks for Slicing in Segment Routing Network
draft-ali-spring-network-slicing-building-blocks-02

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SPRING Working Group                                              Z. Ali
Internet-Draft                                               C. Filsfils
Intended status: Standards Track                            P. Camarillo
Expires: May 6, 2020                                       Cisco Systems
                                                                D. Voyer 
                                                             Bell Canada
                                                        November 3, 2019

          Building blocks for Slicing in Segment Routing Network 
         draft-ali-spring-network-slicing-building-blocks-02.txt 

   Abstract 
    
    
   This document describes how to build network slice using the 
   Segment Routing based technology. It explains how the existing  
   building blocks specified for the Segment Routing can be used for 
   this purpose.  
     
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   Internet-Draft      Network Slicing Using SR 

   Table of Contents 

      1  Introduction...................................................2 
      2  Segment Routing Policy.........................................3 
         2.1  Flex-Algorithm Based SR Policies .........................4 
         2.2  On-demand SR policy ......................................5 
         2.3  Automatic Steering .......................................6 
         2.4  Inter-domain Considerations ..............................6 
      3  TI-LFA and Microloop Avoidance.................................7 
      4  SR VPN.........................................................7 
      5  Stateless Service Programming..................................7 
      6  Operations, Administration, and Maintenance (OAM)..............8 
      7  QoS............................................................8 
      8  Orchestration at the Controller................................9 
      9  Illustration...................................................9 
      10   Security Considerations .....................................9 
      11   IANA Considerations ........................................10 
      12   References .................................................10 
         12.1   Normative References ..................................10 
         7.2...........................................................10 
      13   Acknowledgments ............................................10 
      14   Contributors ...............................................10 
    

   1  Introduction 
    
   As more and more Service Providers and Enterprises operate a 
   single network infrastructure to support an ever-increasing 
   number of services, the ability to custom fit transport to 
   application needs is critically important. This includes 
   creating network slices with different characteristics can 
   coexist on top of the shared network infrastructure.  
    
   Network Slicing is meant to create (end-to-end) partitioned 
   network infrastructure that can be used to provide 
   differentiated connectivity behaviors to fulfill the 
   requirements of a diverse set of services. Services belonging to 
   different Network slices can be wholly disjoint or can share 
   different parts of the network infrastructure. Network Slicing 
   is one of the requirements in 5G [3GPP 23501].  
    
   Segment Routing enables Service Providers to support Network 
   Slicing without any additional protocol, other than the SR IGP 
   extensions. The network as a whole, in a distributed and 
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