Implementing Nexus L2 EVPN over Segment Routing MPLS

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Updated:May 15, 2020

Document ID:215529

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Introduction

This document describes how to deploy/configure Layer2 EVPN over Segment Routing MPLS on Cisco Nexus 9000 series switches.

Prerequisites

Requirements

Required to have knowledge on BGP, OSPF, MPLS, LDP, RSVP, EVPN, Segment Routing(SR)

Components Used

Cisco Nexus switch 93360YC-FX2 running with 9.3.(3)

Cisco Nexus switch 93240YC-FX2 running with 9.3.(3)

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Background

Define Layer 2 VPN, VPLS/L2-EVPN is a Multipoint-to-Multipoint Layer 2 VPN Service that connects multiple branches of a Customer, in a single logical switched architecture over an IP/MPLS network.

Layer2 EVPN-MPLS SR:

EVPN (RFC 7432) is BGP MPLS-based solution which has been used for next generation Ethernet services in virtualized data center network
EVPN uses several building blocks such as ‘RD’, ‘RT’ and ‘VRF’ from existing MPLS technologies
EVPN operates in contrast to the existing VPLS by enabling control-plane based MAC learning in the core
In EVPN, PEs participating in the EVPN instances learn customer MAC routes in control-plane using MP-BGP protocol
Control-plane MAC learning provides a number of benefits that allow EVPN to address the VPLS shortcomings, including support for multihoming with per-flow load balancing
SR L2 EVPN is new feature available in NXOS 9.3(1) and it‘s supported on Nexus 9300 FX2 series platform

Limitations for L2 EVPN over SR MPLS:

Segment routing Layer 2 EVPN flooding is based on the ingress replication mechanism
It uses EVPN Type 3 Route for BUM Traffic
MPLS core does not support multicast
ARP suppression is not supported
Consistency checking on VPC is not supported
The same L2 EVI and L3 EVI cannot be configured together