Color Operation with BGP Label Unicast
draft-chan-idr-bgp-lu2-01

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IDR Working Group                                                          Louis Chan 
INTERNET-DRAFT                                                         
Intended status: Experimental                                        Juniper Networks 
Expires: Oct 15, 2020                                                    Apr 16, 2020 
                                    
    
                                        
                        Color Operation with BGP Label Unicast 
                           draft-chan-idr-bgp-lu2-01.txt 

   Abstract 

      This document specifies how to carry colored path advertisement via an enhancement 
      to the existing protocol BGP Label Unicast. It would allow backward compatibility 
      with RFC8277. 

      The targeted solution is to use stack of labels advertised via BGP Label Unicast 
      2.0 for end to end traffic steering across multiple IGP domains. The operation is 
      similar to Segment Routing.  

      This proposed protocol will convey the necessary reachability information to the 
      ingress PE node to construct an end to end path 

   Status of this Memo 

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

      Internet-Drafts are working documents of the Internet Engineering Task Force 
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      http://datatracker.ietf.org/drafts/current/. 

      Internet-Drafts are draft documents valid for a maximum of six months and may be 
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      inappropriate to use Internet-Drafts as reference material or to cite them other 
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      This Internet-Draft will expire on Oct 15, 2020. 

   Copyright Notice 

      Copyright (c) 2017 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 
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   Chan                     Expires Oct 15, 2020                    [Page 1] 


   Internet-Draft          draft-chan-idr-bgp-lu2-01.txt               April 2020 
    
      described in Section 4.e of the Trust Legal Provisions and are provided without 
      warranty as described in the Simplified BSD License. 

   Table of Contents 

       
      1. Introduction...................................................2 
      2. Conventions used in this document..............................3 
      3. Carrying Label Mapping Information with Color and Label Stack..4 
         3.1. Color extended community for BGP Labeled Unicast..........4 
         3.2. Color extended community for service prefixes.............5 
      4. Uniqueness of path entries.....................................5 
      5. AIGP consideration.............................................5 
      6. Explicit Withdraw of a <color, prefix>.........................6 
      7. Error Handling Procedure.......................................6 
      8. Controller Compatibility.......................................6 
      9. Security Considerations........................................6 
      10. IANA Considerations...........................................6 
      11. References....................................................7 
         11.1. Normative References.....................................7 
         11.2. Informative References...................................7 
      12. Acknowledgments...............................................8 
       
   1. Introduction 

      The proposed protocol is aimed to solve interdomain traffic steering, with 
      different transport services in mind. One application is low latency service across 
      multiple IGP domains, which could scale up to 100k routers network. 

      BGP is a flexible protocol. With additional of color attribute to BGP Label 
      Unicast, a path with specific color would be given a meaning in application - a low 
      latency path, a fully protected path, or a path for diversity.  

      The stack of labels would mean an end to end path across domains through each ABR 
      or ASBR. Each ABR or ASBR will take one label from the stack, and hence pick the 
      forwarding path to next ABR, ASBR, or the final destination. 

      And the label in the stack may be derived from any of the below 

      - Prefix SID 
      - Binding SID for RSVP LSP  
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