Configuring an EVPN Layer 3 VNI

Follow these steps to configure an EVPN Layer 3 VNI.

1. Configure the TCAM profile to support L3GW. Complete the steps in Configure the TCAM Profile for Layer 3 Gateway.
2. Create VLANs to be extended on the tunnel.
   

   vlan 1-4
   

3. Configure an EVPN instance.
   

   evpn r1
    route-target both auto
    rd auto
    vlan add 2-4
   

4. Configure BGP.
   

   router bgp
     local-as 100
       neighbor 98.0.0.1 remote-as 100
     address-family ipv4 unicast
     !
     address-family ipv6 unicast
     !
     address-family l2vpn evpn
       graceful-restart
       neighbor 98.0.0.1 encapsulation vxlan
       neighbor 98.0.0.1 activate

5. Configure a loopback interface.
   

   interface Loopback 1
    no shutdown
    ip ospf area 0
    ip address 1.2.3.4/32
   

6. Configure a tunnel interface.
   

   interface Ethernet 0/4
    ip ospf area 0
    ip proxy-arp
    ip address 98.0.0.2/24
    no shutdown
   

7. Configure the overlay gateway.
   

   overlay-gateway g1
   type layer2-extension
   ip interface Loopback 1
     map vni auto
   activate
   

8. Configure a VRF.
   

   vrf red
   rd 5:50
   evpn irb ve 100 <peer-gateway> <--Identifies the L3-VNI
   address-family ipv4 unicast
     route-target export 5:100 evpn
     route-target import 5:100 evpn
   !
   address-family ipv6 unicast
     route-target export 5:100 evpn
     route-target import 5:100 evpn
   

9. Configure the L3-VNI Integrated Routing and Bridging (IRB) instance. (An IP address is not required.)
   

   vlan 100  <-- The L3-VNI is a VLAN as a result of auto map mode
   router-interface Ve 100

10. Alternatively, configure the L3-VNI IRB by using a BD. (The L3-VNI is 4K+BD-ID as a result of auto mapping.)
    

    bridge-domain 500 p2mp
     router-interface ve 100
    !
    interface Ve 100
    vrf forwarding red
    no shutdown