Shortest Path Routing Extensions for BGP Protocol
draft-ietf-lsvr-bgp-spf-07

Document Type Active Internet-Draft (lsvr WG)
Last updated 2019-12-10
Replaces draft-keyupate-lsvr-bgp-spf
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Network Working Group                                           K. Patel
Internet-Draft                                              Arrcus, Inc.
Intended status: Standards Track                               A. Lindem
Expires: June 12, 2020                                     Cisco Systems
                                                                S. Zandi
                                                                LinkedIn
                                                           W. Henderickx
                                                                   Nokia
                                                       December 10, 2019

           Shortest Path Routing Extensions for BGP Protocol
                       draft-ietf-lsvr-bgp-spf-07

Abstract

   Many Massively Scaled Data Centers (MSDCs) have converged on
   simplified layer 3 routing.  Furthermore, requirements for
   operational simplicity have led many of these MSDCs to converge on
   BGP as their single routing protocol for both their fabric routing
   and their Data Center Interconnect (DCI) routing.  This document
   describes a solution which leverages BGP Link-State distribution and
   the Shortest Path First (SPF) algorithm similar to Internal Gateway
   Protocols (IGPs) such as OSPF.

Status of This Memo

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   This Internet-Draft will expire on June 12, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Patel, et al.             Expires June 12, 2020                 [Page 1]
Internet-Draft         BGP Protocol SPF Extensions         December 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  BGP Shortest Path First (SPF) Motivation  . . . . . . . .   4
     1.2.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  BGP Peering Models  . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  BGP Single-Hop Peering on Network Node Connections  . . .   5
     2.2.  BGP Peering Between Directly Connected Network Nodes  . .   5
     2.3.  BGP Peering in Route-Reflector or Controller Topology . .   6
   3.  BGP-LS Shortest Path Routing (SPF) SAFI . . . . . . . . . . .   6
   4.  Extensions to BGP-LS  . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Node NLRI Usage . . . . . . . . . . . . . . . . . . . . .   7
       4.1.1.  Node NLRI Attribute SPF Capability TLV  . . . . . . .   7
       4.1.2.  BGP-LS Node NLRI Attribute SPF Status TLV . . . . . .   8
     4.2.  Link NLRI Usage . . . . . . . . . . . . . . . . . . . . .   8
       4.2.1.  BGP-LS Link NLRI Attribute Prefix-Length TLVs . . . .   9
       4.2.2.  BGP-LS Link NLRI Attribute SPF Status TLV . . . . . .   9
     4.3.  Prefix NLRI Usage . . . . . . . . . . . . . . . . . . . .  10
       4.3.1.  BGP-LS Prefix NLRI Attribute SPF Status TLV . . . . .  10
     4.4.  BGP-LS Attribute Sequence-Number TLV  . . . . . . . . . .  10
   5.  Decision Process with SPF Algorithm . . . . . . . . . . . . .  11
     5.1.  Phase-1 BGP NLRI Selection  . . . . . . . . . . . . . . .  12
     5.2.  Dual Stack Support  . . . . . . . . . . . . . . . . . . .  13
     5.3.  SPF Calculation based on BGP-LS NLRI  . . . . . . . . . .  13
     5.4.  NEXT_HOP Manipulation . . . . . . . . . . . . . . . . . .  16
     5.5.  IPv4/IPv6 Unicast Address Family Interaction  . . . . . .  16
     5.6.  NLRI Advertisement and Convergence  . . . . . . . . . . .  17
       5.6.1.  Link/Prefix Failure Convergence . . . . . . . . . . .  17
       5.6.2.  Node Failure Convergence  . . . . . . . . . . . . . .  17
     5.7.  Error Handling  . . . . . . . . . . . . . . . . . . . . .  18
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
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