Shortest Path Routing Extensions for BGP Protocol
draft-ietf-lsvr-bgp-spf-07
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2019-12-10
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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
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 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
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
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described in the Simplified BSD License.
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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