Flowspec Indirection-id Redirect
draft-ietf-idr-flowspec-path-redirect-11
IDR Working Group G. Van de Velde, Ed.
Internet-Draft Nokia
Intended status: Standards Track K. Patel
Expires: November 27, 2020 Arrcus
Z. Li
Huawei Technologies
May 26, 2020
Flowspec Indirection-id Redirect
draft-ietf-idr-flowspec-path-redirect-11
Abstract
This document defines a new extended community known as "FlowSpec
Redirect to indirection-id Extended Community". This extended
community triggers advanced redirection capabilities to flowspec
clients. When activated, this flowspec extended community is used by
a flowspec client to retrieve the corresponding next-hop and encoding
information within a localised indirection-id mapping table.
The functionality detailed in this document allows a network
controller to decouple the BGP flowspec redirection instruction from
the operation of the available paths.
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 [1].
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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material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 27, 2020.
Van de Velde, et al. Expires November 27, 2020 [Page 1]
Internet-Draft Flowspec Indirection-id Redirect May 2020
Copyright Notice
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This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. indirection-id and indirection-id table . . . . . . . . . . . 3
3. Use Case Scenarios . . . . . . . . . . . . . . . . . . . . . 3
3.1. Redirection shortest Path tunnel . . . . . . . . . . . . 3
3.2. Redirection to path-engineered tunnels . . . . . . . . . 4
3.3. Redirection to complex dynamically constructed tunnels . 5
4. Redirect to indirection-id Community . . . . . . . . . . . . 6
5. Redirect using localised indirection-id mapping table . . . . 8
6. Validation Procedures . . . . . . . . . . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 9
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
11.1. Normative References . . . . . . . . . . . . . . . . . . 11
11.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
Flowspec is an extension to BGP that allows for the dissemination of
traffic flow specification rules. This has many possible
applications but the primary one for many network operators is the
distribution of traffic filtering actions for DDoS mitigation. The
flowspec standard rfc5575bis [3] defines a redirect-to-VRF action for
policy-based forwarding, but this mechanism is not always sufficient,
particularly if the redirected traffic needs to be steered onto an
explicit path.
Every flowspec policy route is effectively a rule, consisting of two
parts. The first part, encoded in the NLRI field, provides
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