MP-BGP EVPN VXLAN Configuration

Logical Construct of a Multi Tenant VxLAN EVPN with a Single Tenant in a VRF on a Nexux 9k

One VLAN maps to one Layer-2 VNI Layer-2 VNI per Layer-2 segment
A Tenant can have multiple VLANs, therefore multiple Layer-2 VNIs
Traffic within one Layer-2 VNI is bridged
Traffic between Layer-2 VINs is routed

1 Layer-3 VNI per Tenant (VRF) for routing
VNI X’ is used for routed packets

Initial Config – Per Switch

Enable VXLAN and MP-BGP EVPN Control Plane

feature nv overlay
[enables VXLAN]
feature vn-segment-vlan-based
[enables VLAN-based VXLAN]
feature bgp
[enables BGP]
nv overlay evpn
[enables EVPN control plane for VXLAN]

Other features that may need to be enabled

feature eigrp                          
[enables EIGRP if that is the choosen underlay IGP]
feature pim  
[enables IP PIM multicast routing in the underlay network]
feature interface-vlan  
[enables VLAN SVI interfaces if the VTEP needs to be IP gateway and route for the VXLAN VLAN IP subnet]

EVPN Tenant VRF (create VXLAN tenant VRF)

vrf context evpn-tenant-1
[create a VXLAN Tenant VRF]
    vni 39000
[Specify the L3 VNI for VXLAN rotuing within the VRF]
    rd auto
[define VRF RD (route distinguisher]
       address-family ipv4 unicast
       route-target import 39000:39000
       route-target export 39000:39000
       route-target both auto evpn
[define VRF Route Target and import/export policies in address-family ipv4 unicast]

Example of a 2nd tenant in a VRF

vrf context evpn-tenant-2
   vni 39010
   rd auto
   address-family ipv4 unicast
       route-target import 39010:39010
       route-target export 39010:39010
       route-target both auto evpn

Layer-3 VNI Per Tenant for EVPN Routing – How to Configure Layer-3 VNI per EVPN Tenant VRF Routing Instance

vlan 3900
name l3-vni-vlan-for-tenant-1
   vn-segment 39000
[Create the VLAN for the Layer-3 VNI. One Layer-3 VNI per tenant VRF routing instance]
interface Vlan3900
description l3-vni-for-tenant-1-routing
no shutdown
   vrf member evpn-tenant-1
[Create the SVI interface for the Layer-3 VNI Put this SVI interface into the tenant VRF context]
vrf context evpn-tenant-1
   vni 39000
rd auto
address-family ipv4 unicast
route-target import 39000:39000
route-target export 39000:39000
route-target both auto evpn
[Associate the Layer-3 VNI with the tenant VRF routing instance]

EVPN Layer-3 VNI Per Tenant for Routing Instance – Create SVI interface for Layer-2 VNIs for VXLAN routing

interface Vlan200
no shutdown
[Create SVI interface for a Layer-2 VNI. Associate it with the tenant VRF]
   vrf member evpn-tenant-1
   ip address 20.1.1.1/8
[All VTEPs for this VLAN/VNI should have the same SVI interface IP address as the distributed IP gateway]
   fabric forwarding mode anycast-gateway
[Enable distributed anycast gateway for this VLAN/VNI]

EVPN Distributed Gateway

fabric forwarding anycast-gateway-mac 0002.0002.0002
[Configure distributed gateway virtual MAC address One virtual MAC per VTEP All VTEPs should have the same virtual MAC address]
interface Vlan210
no shutdown
vrf member evpn-tenant-2
   ip address 21.1.1.1/8
[Configure virtual IP address All VTEPs for this VLAN should have the same virtual IP address]
   fabric forwarding mode anycast-gateway
[Enable distributed gateway for this VLAN]

VXLAN Tunnel Interface Configuration – Configure VXLAN tunnel interface nve1

interface nve1
no shutdown
   source-interface loopback0
[specify loopback0 as the source interface]
   host-reachability protocol bgp
[Define BGP as the mechanism for host reachability advertisement]
   member vni 20000
[Associate tenant VNIs to the tunnel interface nve1
Define the mcast group on a per-VNI basis
Enable arp suppression on a per-VNI basis]
      suppress-arp
      mcast-group 239.1.1.1
   member vni 21000
      suppress-arp
      mcast-group 239.1.1.2
member vni 39000 associate-vrf
member vni 39010 associate-vrf
[Add Layer-3 VNIs, one per tenant VRF]

interface loopback 0
ip address 10.1.1.11/32

MP-BGP Configuration on VTEP

router bgp 100
router-id 10.1.1.11
log-neighbor-changes
   address-family ipv4 unicast
[Address-family ipv4 unicast for prefix-based routing]
   address-family l2vpn evpn
[Address-family l2vpn evpn for evpn host routes]
   neighbor 10.1.1.1 remote-as 100
[Define MP-BGP neighbors. Under each neighbor define address-family ipv4 unicast and l2vpn evpn]
update-source loopback0
address-family ipv4 unicast
      address-family l2vpn evpn
[Send extended community in l2vpn evpn address-family to distribute EVPN route attributes]
         send-community extended
   neighbor 10.1.1.2 remote-as 100
update-source loopback0
address-family ipv4 unicast
      address-family l2vpn evpn
         send-community extended

vrf evpn-tenant-1
[Under address-family ipv4 unicast of each tenant VRF instance, enable advertising EVPN routes]
   address-family ipv4 unicast
      advertise l2vpn evpn
vrf evpn-tenant-2
   address-family ipv4 unicast
      advertise l2vpn evpn

MP-BGP Configuration on iBGP Route Reflector

router bgp 100
router-id 10.1.1.1
log-neighbor-changes
   address-family ipv4 unicast
[Address-family ipv4 unicast for prefix-based routing]
   address-family l2vpn evpn
      retain route-target all
[Address-family l2vpn evpn for EVPN vxlan host routes Retain route-targets attributes]
template peer vtep-peer
[iBGP RR client peer template]
remote-as 100
update-source loopback0
      address-family ipv4 unicast

[Send both standard and extended community in address-family ipv4 unicast]
   send-community both
      route-reflector-client
   address-family l2vpn evpn
[Send both standard and extended community in address-family l2vpn evpn]
      send-community both
      route-reflector-client
neighbor 10.1.1.11
inherit peer vtep-peer
neighbor 10.1.1.12
inherit peer vtep-peer
neighbor 10.1.1.13
inherit peer vtep-peer
neighbor 10.1.1.14
inherit peer vtep-peer

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