BGP Neighbor Discovery
draft-xu-idr-neighbor-autodiscovery-10

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Last updated 2018-10-22
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Network Working Group                                              X. Xu
Internet-Draft                                               Alibaba Inc
Intended status: Standards Track                           K. Talaulikar
Expires: April 25, 2019                                    Cisco Systems
                                                                   K. Bi
                                                                  Huawei
                                                             J. Tantsura
                                                        N. Triantafillis
                                                                  Apstra
                                                        October 22, 2018

                         BGP Neighbor Discovery
                 draft-xu-idr-neighbor-autodiscovery-10

Abstract

   BGP is being used as the underlay routing protocol in some large-
   scaled data centers (DCs).  Most popular design followed is to do
   hop-by-hop external BGP (EBGP) session configurations between
   neighboring routers on a per link basis.  The provisioning of BGP
   neighbors in routers across such a DC brings its own operational
   complexity.

   This document introduces a BGP neighbor discovery mechanism that
   greatly simplifies BGP operations in such DC and other networks by
   automatic setup of BGP sessions between neighbor routers using this
   mechanism.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
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   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

Xu, et al.               Expires April 25, 2019                 [Page 1]
Internet-Draft                                              October 2018

   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 April 25, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  UDP Message Header  . . . . . . . . . . . . . . . . . . . . .   7
   7.  Hello Message Format  . . . . . . . . . . . . . . . . . . . .   8
   8.  Hello Message TLVs  . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  Accepted ASN List TLV . . . . . . . . . . . . . . . . . .  10
     8.2.  Peering Address TLV . . . . . . . . . . . . . . . . . . .  11
     8.3.  Local Prefix TLV  . . . . . . . . . . . . . . . . . . . .  13
     8.4.  Link Attributes TLV . . . . . . . . . . . . . . . . . . .  14
     8.5.  Neighbor TLV  . . . . . . . . . . . . . . . . . . . . . .  16
     8.6.  Cryptographic Authentication TLV  . . . . . . . . . . . .  18
   9.  Neighbor Discovery Procedure  . . . . . . . . . . . . . . . .  20
     9.1.  Interface Procedures  . . . . . . . . . . . . . . . . . .  20
     9.2.  Adjacency State Machine . . . . . . . . . . . . . . . . .  21
       9.2.1.  Down State  . . . . . . . . . . . . . . . . . . . . .  21
       9.2.2.  Initial State . . . . . . . . . . . . . . . . . . . .  22
       9.2.3.  1-Way State . . . . . . . . . . . . . . . . . . . . .  22
       9.2.4.  2-Way State . . . . . . . . . . . . . . . . . . . . .  22
       9.2.5.  Adj-Reject State  . . . . . . . . . . . . . . . . . .  23
       9.2.6.  Adj-OK State  . . . . . . . . . . . . . . . . . . . .  24
       9.2.7.  Accepted State  . . . . . . . . . . . . . . . . . . .  24
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