EVPN Network Layer Fault Management
draft-ietf-bess-evpn-bfd-03
INTERNET-DRAFT V. Govindan
Intended status: Proposed Standard M. Mudigonda
A. Sajassi
Cisco Systems
G. Mirsky
ZTE
D. Eastlake
Futurewei Technologies
Expires: August 21, 2021 February 22, 2021
EVPN Network Layer Fault Management
draft-ietf-bess-evpn-bfd-03
Abstract
This document specifies proactive, in-band network layer OAM
mechanisms to detect loss of continuity and miss-connection faults
that affect unicast and multi-destination paths (used by Broadcast,
Unknown Unicast, and Multicast traffic) in an Ethernet VPN (EVPN)
network. The mechanisms specified in the draft are based on the
widely adopted Bidirectional Forwarding Detection (BFD) protocol.
Status of this Memo
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provisions of BCP 78 and BCP 79.
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Govindan, et al [Page 1]
Internet-Draft EVPN Network Layer Fault Management
Table of Contents
1. Introduction............................................3
1.1 Terminology............................................3
2. Scope of this Document..................................5
3. Motivation for Running BFD at the EVPN Network Layer....6
4. Fault Detection for Unicast Traffic.....................7
5. Fault Detection for BUM Traffic.........................8
5.1 Ingress Replication....................................8
5.2 P2MP Tunnels (Label Switched Multicast)................8
6. BFD Packet Encapsulation...............................10
6.1 MPLS Encapsulation....................................10
6.1.1 Unicast MPLS Encapsulation..........................10
6.1.2 MPLS Ingress Replication (MP2P).....................11
6.1.3 MPLS LSM (Label Switched Multicast, P2MP)...........12
6.2 VXLAN Encapsulation...................................12
6.2.1 Unicast VXLAN Encapsulation.........................12
6.2.2 VXLAN Ingress Replication (MP2P)....................14
6.2.3 VXLAN LSM (Label Switched Multicast, P2MP)..........14
7. Scalability Considerations.............................15
8. IANA Considerations....................................16
8.1 Pseudowire Associated Channel Type....................16
8.2 MAC Addresses.........................................16
8.3 BFD Discriminator Attribute Type......................16
9. Security Considerations................................17
Acknowledgements..........................................17
Normative References......................................18
Informative References....................................20
Authors' Addresses........................................21
Govindan, et al [Page 2]
Internet-Draft EVPN Network Layer Fault Management
1. Introduction
[ietf-bess-evpn-oam-req-frmwk] outlines the OAM requirements of
Ethernet VPN networks (EVPN [RFC7432]). This document specifies
mechanisms for proactive fault detection at the network (overlay)
layer of EVPN. The mechanisms proposed in the draft use the widely
adopted Bidirectional Forwarding Detection (BFD [RFC5880]) protocol.
EVPN fault detection mechanisms need to consider unicast traffic
separately from Broadcast, Unknown Unicast, and Multicast (BUM)
traffic since they map to different Forwarding Equivalency Classes
(FECs) in EVPN. Hence this document proposes somewhat different fault
detection mechanisms depending on the type of traffic and the type of
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