Color Operation with BGP Label Unicast
draft-chan-idr-bgp-lu2-02

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Author Louis Chan 
Last updated 2020-08-31
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IDR Working Group                                                           Louis Chan 
INTERNET-DRAFT                                                          
Intended status: Experimental                                         Juniper Networks 
Expires: Mar 31, 2021                                                      Sep 1, 2020 
                                    
    
                                        
                        Color Operation with BGP Label Unicast 
                           draft-chan-idr-bgp-lu2-02.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. 

      There is a major change of protocol format starting from this updated draft. 

   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 
      (IETF).  Note that other groups may also distribute working documents as Internet-
      Drafts.  The list of current Internet-Drafts is at 
      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 
      than as "work in progress." 

      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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      publication of this document.  Please review these documents carefully, as they 
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   Chan                     Expires Mar 31, 2021                    [Page 1] 

                                             


   Internet-Draft          draft-chan-idr-bgp-lu2-02.txt                      Sep 2020 
    
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   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. Use of Add-path to advertise multiple color paths .....................4 
         3.2. Color extended community for BGP Labeled Unicast ......................4 
         3.3. Color extended community for service prefixes .........................5 
         3.4. Color Slicing Capability ..............................................6 
      4. Uniqueness of path entries .................................................7 
      5. AIGP consideration .........................................................7 
      6. Explicit Withdraw of a <path-id, color(s), prefix> .........................7 
      7. Error Handling Procedure ...................................................8 
      8. Controller Compatibility ...................................................8 
      9. Security Considerations ....................................................8 
      10. IANA Considerations .......................................................8 
      11. References ................................................................8 
         11.1. Normative References .................................................8 
         11.2. Informative References ...............................................8 
      12. Acknowledgments ...........................................................9 
       
   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 or more routers network. 

      BGP is a flexible protocol. With additional of color attribute to BGP Label 
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