Bidirectional Forwarding Detection (BFD) in Segment Routing Networks Using MPLS Dataplane
draft-mirsky-spring-bfd-07
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2019-02-24
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SPRING Working Group G. Mirsky
Internet-Draft ZTE Corp.
Intended status: Standards Track J. Tantsura
Expires: August 28, 2019 Nuage Networks
I. Varlashkin
Google
M. Chen
Huawei
February 24, 2019
Bidirectional Forwarding Detection (BFD) in Segment Routing Networks
Using MPLS Dataplane
draft-mirsky-spring-bfd-07
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 August 28, 2019.
Mirsky, et al. Expires August 28, 2019 [Page 1]
Internet-Draft BFD in SPRING MPLS February 2019
Copyright Notice
Copyright (c) 2019 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
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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 . . . . . . . . . . . . . . . . . . . . . . . 3
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. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7.1. Non-FEC Path TLV . . . . . . . . . . . . . . . . . . . . 7
7.2. Return Code . . . . . . . . . . . . . . . . . . . . . . . 8
8. Security Considerations . . . . . . . . . . . . . . . . . . . 9
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
10.1. Normative References . . . . . . . . . . . . . . . . . . 9
10.2. Informative References . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
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
standards implicitly assume that the egress BFD peer, which is the
egress Label Edge Router (LER), will use the shortest path route
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