Enhanced AS-Loop Detection for BGP
draft-chen-grow-enhanced-as-loop-detection-04
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2020-03-09
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Network Working Group H. Chen
Internet-Draft China Telecom
Intended status: Standards Track D. Ma
Expires: September 10, 2020 ZDNS
Y. Gu
S. Zhuang
H. Wang
Huawei
March 09, 2020
Enhanced AS-Loop Detection for BGP
draft-chen-grow-enhanced-as-loop-detection-04
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
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
Chen, et al. Expires September 10, 2020 [Page 1]
Internet-Draft Enhanced AS-Loop Detection March 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 September 10, 2020.
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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Internet-Draft Enhanced AS-Loop Detection March 2020
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