EVPN Egress Protection
draft-wang-bess-evpn-egress-protection-04
BESS WG Y. Wang
Internet-Draft R. Chen
Intended status: Standards Track ZTE Corporation
Expires: 2 May 2021 29 October 2020
EVPN Egress Protection
draft-wang-bess-evpn-egress-protection-04
Abstract
A fast reroute framework for egress node protection is specified by
[RFC8679] . But it cannot be applied to EVPN directly. This document
specifies a mechanism to apply Egress Node Protection to EVPN nodes
and apply Egress Link Protection to EVPN EAD/EVI routes, especially
for the convergency of BUM packets and the unified signallings for
the MPLS SPEs and TPEs.
Status of This Memo
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This Internet-Draft will expire on 2 May 2021.
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Wang & Chen Expires 2 May 2021 [Page 1]
Internet-Draft EVPN Egress Protection October 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology and Acronyms . . . . . . . . . . . . . . . . 3
2. Detailed Problem and Solution Requirement . . . . . . . . . . 4
2.1. Scenarios and Basic Settings . . . . . . . . . . . . . . 5
2.1.1. Common Problems . . . . . . . . . . . . . . . . . . . 6
2.2. VXLAN-Specific Requirements . . . . . . . . . . . . . . . 6
2.3. SRv6-Specific Requirements . . . . . . . . . . . . . . . 7
2.4. ESI-Label-Specific Requirements . . . . . . . . . . . . . 7
2.5. MPLS-Specific Requirements . . . . . . . . . . . . . . . 7
3. Encoding the Originating Router's IP Address . . . . . . . . 8
4. Control Plane Processing . . . . . . . . . . . . . . . . . . 8
4.1. Common Procedures . . . . . . . . . . . . . . . . . . . . 8
4.2. VXLAN-Specific Procedures . . . . . . . . . . . . . . . . 9
4.3. SRv6-Specific Procedures . . . . . . . . . . . . . . . . 10
4.4. MPLS-Specific Procedures . . . . . . . . . . . . . . . . 10
5. Protection Procedures . . . . . . . . . . . . . . . . . . . . 11
5.1. EVPN Egress Node Protection (EENP) . . . . . . . . . . . 11
5.1.1. BUM Forwarding Protection . . . . . . . . . . . . . . 11
5.1.1.1. Bypass-BUM Filter . . . . . . . . . . . . . . . . 11
5.1.1.2. NDF-Bias Rules for Bypass-BUM filter . . . . . . 12
5.1.2. Unicast Forwarding Protection . . . . . . . . . . . . 13
5.2. Egress ESI Link Protection (EELP) . . . . . . . . . . . . 13
5.2.1. Source Squelching Rules . . . . . . . . . . . . . . . 14
5.2.2. SRv6-specific EELP Rules . . . . . . . . . . . . . . 14
5.2.3. MPLS-specific EELP Rules . . . . . . . . . . . . . . 15
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
7. Security Considerations . . . . . . . . . . . . . . . . . . . 15
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 15
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
9.1. Normative References . . . . . . . . . . . . . . . . . . 15
9.2. Informative References . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction
A principal feature of EVPN is the ability to support multi-homing
from a customer equipment (CE) to multiple PE with Ethernet segment
(ES) links. This draft specifies a egress protection mechanism in
the multi-homed cases and enhance EVPN convergency on the egress PE
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