Enhanced AS-Loop Detection for BGP
draft-chen-grow-enhanced-as-loop-detection-05

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Last updated 2020-09-10
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Network Working Group                                            H. Chen
Internet-Draft                                             China Telecom
Intended status: Standards Track                                   D. Ma
Expires: March 14, 2021                                             ZDNS
                                                                   Y. Gu
                                                               S. Zhuang
                                                                 H. Wang
                                                                  Huawei
                                                      September 10, 2020

                   Enhanced AS-Loop Detection for BGP
             draft-chen-grow-enhanced-as-loop-detection-05

Abstract

   Misconfiguration and malicious manipulation of BGP AS_Path may lead
   to route hijack.  This document proposes to enhance the BGP [RFC4271]
   Inbound/ Outbound route processing in the case of detecting an AS
   loop.  It is an enhancement to the current BGP's Inbound/Outbound
   processing and can be implemented directly on the device, and this
   document also proposes a centralized usecase.  This could empower
   networks to quickly and accurately figure out they're being
   victimized.

   Two options are proposed for the enhancement, a) a local check at the
   device; b) data collection/analysis at the remote network controller/
   server.  Both approaches are beneficial for route hijack detection.

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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   and may be updated, replaced, or obsoleted by other documents at any

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   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 March 14, 2021.

Copyright Notice

   Copyright (c) 2020 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Forged AS_PATH Examples . . . . . . . . . . . . . . . . . . .   4
     3.1.  AS Loop Detected at Inbound Processing  . . . . . . . . .   4
     3.2.  AS Loop Detected at Outbound Processing . . . . . . . . .   5
   4.  Enhancement to BGP Inbound/Outbound Processing  . . . . . . .   6
     4.1.  Enhancement for AS Loop Detected at Inbound Process . . .   6
     4.2.  Enhancement for AS Loop Detected at Outbound Process  . .   7
   5.  Centralized AS-Loop Detection for BGP . . . . . . . . . . . .   7
     5.1.  BMP Support for Monitoring AS Path Looped Update Message    7
     5.2.  Application Example . . . . . . . . . . . . . . . . . . .   8
   6.  Benefits  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   The Border Gateway Protocol (BGP) [RFC4271], as an inter-autonomous
   (AS) routing protocol, is used to exchange network reachability
   information between BGP systems.  BGP is widely used by Internet
   Service Providers (ISPs) and large organizations.

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