Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane
draft-mirsky-spring-bfd-09
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2019-12-19
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SPRING Working Group G. Mirsky
Internet-Draft ZTE Corp.
Intended status: Standards Track J. Tantsura
Expires: June 21, 2020 Apstra, Inc.
I. Varlashkin
Google
M. Chen
Huawei
December 19, 2019
Bidirectional Forwarding Detection (BFD) in Segment Routing Networks
Using MPLS Dataplane
draft-mirsky-spring-bfd-09
Abstract
Segment Routing (SR) architecture leverages the paradigm of source
routing. It can be realized in the Multiprotocol Label Switching
(MPLS) network without any change to the data plane. A segment is
encoded as an MPLS label, and an ordered list of segments is encoded
as a stack of labels. Bidirectional Forwarding Detection (BFD) is
expected to monitor any existing path between systems. This document
defines how to use Label Switched Path Ping to bootstrap a BFD
session, control path in reverse direction of the SR-MPLS tunnel and
applicability of BFD Demand mode in the SR-MPLS domain.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on June 21, 2020.
Mirsky, et al. Expires June 21, 2020 [Page 1]
Internet-Draft BFD in SPRING MPLS December 2019
Copyright Notice
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document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.1. Terminology . . . . . . . . . . . . . . . . . . . . . 3
1.1.2. Requirements Language . . . . . . . . . . . . . . . . 3
2. Bootstrapping BFD Session over Segment Routed Tunnel with
MPLS Data Plane . . . . . . . . . . . . . . . . . . . . . . . 4
3. Use BFD Reverse Path TLV over Segment Routed MPLS Tunnel . . 5
4. Use Non-FEC Path TLV . . . . . . . . . . . . . . . . . . . . 5
5. BFD Reverse Path TLV over Segment Routed MPLS Tunnel with
Dynamic Control Plane . . . . . . . . . . . . . . . . . . . . 7
6. Applicability of BFD Demand Mode in SR-MPLS Domain . . . . . 7
7. Using BFD to Monitor Pont-to-Multipoint SR Policy . . . . . . 7
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
8.1. Non-FEC Path TLV . . . . . . . . . . . . . . . . . . . . 8
8.2. Return Code . . . . . . . . . . . . . . . . . . . . . . . 9
9. Implementation Status . . . . . . . . . . . . . . . . . . . . 9
10. Security Considerations . . . . . . . . . . . . . . . . . . . 10
11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
12.1. Normative References . . . . . . . . . . . . . . . . . . 10
12.2. Informative References . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
[RFC5880], [RFC5881], and [RFC5883] defined the operation of
Bidirectional Forwarding Detection (BFD) protocol between the two
systems over IP networks. [RFC5884] and [RFC7726] set rules for
using BFD Asynchronous mode over point-to-point (p2p) Multiprotocol
Label Switching (MPLS) Label Switched Path (LSP). These latter
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