BGP Neighbor Discovery
draft-xu-idr-neighbor-autodiscovery-11
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2019-04-16
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Network Working Group X. Xu
Internet-Draft Alibaba Inc
Intended status: Standards Track K. Talaulikar
Expires: October 18, 2019 Cisco Systems
K. Bi
Huawei
J. Tantsura
N. Triantafillis
Apstra
April 16, 2019
BGP Neighbor Discovery
draft-xu-idr-neighbor-autodiscovery-11
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
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
Xu, et al. Expires October 18, 2019 [Page 1]
Internet-Draft April 2019
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 October 18, 2019.
Copyright Notice
Copyright (c) 2019 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 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
the Trust Legal Provisions and are provided without warranty as
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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