Enhanced AS-Loop Detection for BGP
draft-chen-grow-enhanced-as-loop-detection-05
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
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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Internet-Draft Enhanced AS-Loop Detection September 2020
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
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document authors. All rights reserved.
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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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