Fault Management for EVPN networks
draft-ietf-bess-evpn-bfd-00
INTERNET-DRAFT V. Govindan
Intended status: Proposed Standard M. Mudigonda
A. Sajassi
Cisco Systems
G. Mirsky
ZTE
D. Eastlake
Futurewei Technologies
Expires: October 29, 2020 April 30, 2020
Fault Management for EVPN networks
draft-ietf-bess-evpn-bfd-00
Abstract
This document specifies proactive, in-band network 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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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Govindan, et al [Page 1]
Internet-Draft Fault Management for EVPN
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................................9
6.1 MPLS Encapsulation.....................................9
6.1.1 Unicast..............................................9
6.1.2 Ingress Replication.................................10
6.1.3 LSM (Label Switched Multicast, P2MP)................11
6.2 VXLAN Encapsulation...................................11
6.2.1 Unicast.............................................11
6.2.2 Ingress Replication.................................13
6.2.3 LSM (Label Switched Multicast, P2MP)................13
7. BGP Distribution of BFD Discriminators.................14
8. Scalability Considerations.............................14
9. IANA Considerations....................................15
9.1 Pseudowire Associated Channel Type....................15
9.2 MAC Address...........................................15
10. Security Considerations...............................15
Acknowledgement...........................................15
Normative References......................................16
Informative References....................................18
Authors' Addresses........................................19
Govindan, et al [Page 2]
Internet-Draft Fault Management for EVPN
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 different fault
detection mechanisms to suit each type, for unicast traffic using BFD
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