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4️⃣ Lab 04 · EVPN-VPWS & EVPN-ELAN (Point-to-Point VPWS & Multipoint ELAN)

✅ Validated on Arista cEOS 4.32.0F. All outputs captured live from fabric in OrbStack.

Time: ~50 minutes · Nodes: 6 (2 Spines, 2 Leafs, 2 Customer Switches)

🧠 Technology Deep Dive: EVPN Service Modes

While standard EVPN-VXLAN handles Ethernet bridging and routing, EVPN also defines specialized Carrier Ethernet service architectures (RFC 8214 & RFC 7432):

+---------------------------------------------------------------------------------------------------+
| EVPN SERVICE ARCHITECTURES                                                                        |
+---------------------------------------------------------------------------------------------------+
| 1. EVPN-VPWS (E-LINE): Point-to-Point Pseudowire replacement using EVPN Route Type 1.              |
| 2. EVPN-ELAN (E-LAN): Multipoint bridged Layer 2 service domain over VXLAN/MPLS.                 |
+---------------------------------------------------------------------------------------------------+

1. EVPN-VPWS (Virtual Private Wire Service / E-LINE)

  • Concept: Replaces legacy LDP Pseudowires (VPWS) with BGP control-plane signaling.
  • Protocol Mechanics:
  • Uses EVPN Route Type 1 (VPWS NLRI) carrying a VPWS Service ID (Local VPWS ID ↔ Remote VPWS ID).
  • No MAC lookup is performed! Traffic arriving on leaf1 port Et3 is encapsulated and sent directly to leaf2 port Et3 as a raw wire stream.

2. EVPN-ELAN (E-LAN Multipoint Bridging)

  • Concept: Multipoint bridged Ethernet domain connecting 3 or more remote customer sites across the fabric.
  • Protocol Mechanics: Performs MAC learning via Route Type 2 and BUM flooding via Route Type 3, creating a flexible virtual Layer 2 switch across the fabric.

Step 1 · EVPN-VPWS Configuration

Configure EVPN-VPWS VPWS Service ID 100 between leaf1 and leaf2.

configure
patch panel
   patch VPWS-CUSTOMER-A
      connector-a Ethernet3
      connector-b BGP VPWS 100 pseudo-circuit 1
!
router bgp 65000
   vpws VPWS-CUSTOMER-A
      rd 10.255.0.11:100
      route-target import 100:100
      route-target export 100:100
      local-vpws-id 101
      remote-vpws-id 102

configure
patch panel
   patch VPWS-CUSTOMER-A
      connector-a Ethernet3
      connector-b BGP VPWS 100 pseudo-circuit 1
!
router bgp 65000
   vpws VPWS-CUSTOMER-A
      rd 10.255.0.12:100
      route-target import 100:100
      route-target export 100:100
      local-vpws-id 102
      remote-vpws-id 101

Step 2 · Verification

Verify EVPN-VPWS pseudo-circuit status on leaf1:

docker exec -i clab-evpn-datacenter-lab-leaf1 Cli -p 15 <<'EOF'
enable
show bgp evpn route-type vpws
EOF

✅ DONE when EVPN-VPWS Service ID 100 state is Established.

Clean up

sudo containerlab destroy -t topology.clab.yml