EVPN Multi-Homing Extensions for Split Horizon Filtering
draft-ietf-bess-evpn-mh-split-horizon-00
BESS Workgroup J. Rabadan, Ed.
Internet-Draft K. Nagaraj
Intended status: Standards Track Nokia
Expires: April 12, 2021 W. Lin
Juniper
A. Sajassi
Cisco
October 9, 2020
EVPN Multi-Homing Extensions for Split Horizon Filtering
draft-ietf-bess-evpn-mh-split-horizon-00
Abstract
Ethernet Virtual Private Network (EVPN) is commonly used along with
Network Virtualization Overlay (NVO) tunnels. The EVPN multi-homing
procedures may be different depending on the NVO tunnel type used in
the EVPN Broadcast Domain. In particular, there are two multi-homing
Split Horizon procedures to avoid looped frames on the multi-homed
CE: ESI Label based and Local Bias. ESI Label based Split Horizon is
used for MPLSoX tunnels, E.g., MPLSoUDP, whereas Local Bias is used
for others, E.g., VXLAN tunnels. The current specifications do not
allow the operator to decide which Split Horizon procedure to use for
tunnel encapsulations that could support both. Examples of tunnels
that may support both procedures are MPLSoGRE, MPLSoUDP, GENEVE or
SRv6. This document extends the EVPN Multi-Homing procedures so that
an operator can decide the Split Horizon procedure for a given NVO
tunnel depending on their own requirements.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 12, 2021.
Rabadan, et al. Expires April 12, 2021 [Page 1]
Internet-Draft EVPN MH Split Horizon Extensions October 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Conventions and Terminology . . . . . . . . . . . . . . . 5
2. BGP EVPN Extensions . . . . . . . . . . . . . . . . . . . . . 7
2.1. The Split Horizon Type (SHT) . . . . . . . . . . . . . . 7
2.2. Use of the Split Horizon Type In A-D Per ES Routes . . . 8
2.3. ESI Label Value In A-D Per ES Routes . . . . . . . . . . 9
2.4. Backwards Compatibility With [RFC8365] NVEs . . . . . . . 10
3. Procedures for NVEs Supporting Multiple Encapsulations . . . 10
4. Security Considerations . . . . . . . . . . . . . . . . . . . 12
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1. Normative References . . . . . . . . . . . . . . . . . . 13
6.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 14
Appendix B. Contributors . . . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
Ethernet Virtual Private Network (EVPN) is commonly used along with
Network Virtualization Overlay (NVO) tunnels and specified in
[RFC8365]. The EVPN multi-homing procedures may be different
depending on the NVO tunnel type used in the EVPN Broadcast Domain.
In particular, there are two Multi-Homing Split Horizon procedures to
avoid looped frames on the multi-homed CE: ESI Label based and Local
Bias. ESI Label based Split Horizon is used for MPLSoX tunnels,
E.g., MPLSoUDP [RFC7510], and its procedures described in [RFC7432].
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