BGP Link-State Shortest Path First (SPF) Routing
draft-ietf-lsvr-bgp-spf-13

Document Type Active Internet-Draft (lsvr WG)
Authors Keyur Patel  , Acee Lindem  , Shawn Zandi  , Wim Henderickx 
Last updated 2021-02-22
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: August 26, 2021                                   Cisco Systems
                                                                S. Zandi
                                                                LinkedIn
                                                           W. Henderickx
                                                                   Nokia
                                                       February 22, 2021

            BGP Link-State Shortest Path First (SPF) Routing
                       draft-ietf-lsvr-bgp-spf-13

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 extensions to BGP to use BGP Link-State distribution and
   the Shortest Path First (SPF) algorithm used by Internal Gateway
   Protocols (IGPs) such as OSPF.  In doing this, it allows BGP to be
   efficiently used as both the underlay protocol and the overlay
   protocol in MSDCs.

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 https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 26, 2021.

Patel, et al.            Expires August 26, 2021                [Page 1]
Internet-Draft         BGP Link-State SPF Routing          February 2021

Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  BGP Shortest Path First (SPF) Motivation  . . . . . . . .   4
     1.3.  Document Overview . . . . . . . . . . . . . . . . . . . .   6
     1.4.  Requirements Language . . . . . . . . . . . . . . . . . .   6
   2.  Base BGP Protocol Relationship  . . . . . . . . . . . . . . .   6
   3.  BGP Link-State (BGP-LS) Relationship  . . . . . . . . . . . .   7
   4.  BGP Peering Models  . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  BGP Single-Hop Peering on Network Node Connections  . . .   8
     4.2.  BGP Peering Between Directly-Connected Nodes  . . . . . .   8
     4.3.  BGP Peering in Route-Reflector or Controller Topology . .   9
   5.  BGP Shortest Path Routing (SPF) Protocol Extensions . . . . .   9
     5.1.  BGP-LS Shortest Path Routing (SPF) SAFI . . . . . . . . .   9
       5.1.1.  BGP-LS-SPF NLRI TLVs  . . . . . . . . . . . . . . . .   9
       5.1.2.  BGP-LS Attribute  . . . . . . . . . . . . . . . . . .  10
     5.2.  Extensions to BGP-LS  . . . . . . . . . . . . . . . . . .  11
       5.2.1.  Node NLRI Usage . . . . . . . . . . . . . . . . . . .  11
         5.2.1.1.  Node NLRI Attribute SPF Capability TLV  . . . . .  11
         5.2.1.2.  BGP-LS-SPF Node NLRI Attribute SPF Status TLV . .  12
       5.2.2.  Link NLRI Usage . . . . . . . . . . . . . . . . . . .  13
         5.2.2.1.  BGP-LS-SPF Link NLRI Attribute Prefix-Length TLVs  14
         5.2.2.2.  BGP-LS-SPF Link NLRI Attribute SPF Status TLV . .  14
       5.2.3.  IPv4/IPv6 Prefix NLRI Usage . . . . . . . . . . . . .  15
         5.2.3.1.  BGP-LS-SPF Prefix NLRI Attribute SPF Status TLV .  16
       5.2.4.  BGP-LS Attribute Sequence-Number TLV  . . . . . . . .  16
     5.3.  NEXT_HOP Manipulation . . . . . . . . . . . . . . . . . .  17
   6.  Decision Process with SPF Algorithm . . . . . . . . . . . . .  18
     6.1.  BGP NLRI Selection  . . . . . . . . . . . . . . . . . . .  19
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