BGP Dissemination of Flow Specification Rules for Tunneled Traffic
draft-ietf-idr-flowspec-nvo3-09
INTERNET-DRAFT D. Eastlake
Intended Status: Proposed Standard Futurewei Technologies
W. Hao
S. Zhuang
Z. Li
Huawei Technologies
R. Gu
China Mobil
Expires: October 11, 2020 April 12, 2020
BGP Dissemination of
Flow Specification Rules for Tunneled Traffic
draft-ietf-idr-flowspec-nvo3-09
Abstract
This draft specifies a Border Gateway Protocol (BGP) Network Layer
Reachability Information (NLRI) encoding format for flow
specifications (RFC 5575bis) that can match on a variety of tunneled
traffic. In addition, flow specification components are specified for
certain tunneling header fields.
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D. Eastlake, et al [Page 1]
INTERNET-DRAFT BGP Tunnel Flowspec
Table of Contents
1. Introduction............................................3
1.1 Terminology............................................3
2. Tunneled Traffic Flow Specification NLRI................5
2.1 The SAFI Code Point....................................7
2.2 Tunnel Header Component Code Points....................8
2.3 Specific Tunnel Types..................................9
2.3.1 VXLAN................................................9
2.3.2 VXLAN-GPE...........................................10
2.3.3 NVGRE...............................................11
2.3.4 L2TPv3..............................................11
2.3.5 GRE.................................................12
2.3.6 IP-in-IP............................................12
2.4 Tunneled Traffic Actions..............................13
3. Order of Traffic Filtering Rules.......................14
4. Flow Spec Validation...................................15
5. Security Considerations................................15
6. IANA Considerations....................................15
Normative References......................................16
Informative References....................................17
Acknowledgments...........................................18
Authors' Addresses........................................18
D. Eastlake, et al [Page 2]
INTERNET-DRAFT BGP Tunnel Flowspec
1. Introduction
BGP Flow Specification (flowspec [RFC5575bis]) is an extension to BGP
that supports the dissemination of traffic flow specification rules.
It uses the BGP control plane to simplify the distribution of Access
Control Lists (ACLs) and allows new filter rules to be injected to
all BGP peers simultaneously without changing router configuration. A
typical application of BGP flowspec is to automate the distribution
of traffic filter lists to routers for Distributed Denial of Service
(DDOS) mitigation.
BGP flowspec defines BGP Network Layer Reachability Information
(NLRI) formats used to distribute traffic flow specification rules.
AFI=1/SAFI=133 is for IPv4 unicast filtering. AFI=1/SAFI=134 is for
IPv4 BGP/MPLS VPN filtering. [FlowSpecV6] and [FlowSpecL2] extend the
flowspec rules for IPv6 and Layer 2 Ethernet packets respectively.
None of these previously defined flow specifications are suitable for
matching in cases of tunneling or encapsulation where there might be
duplicates of a layer of header such as two IPv6 headers in IP-in-IP
or a nested header sequence such as the Layer 2 and 3 headers
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