Packet capture on the municipal WAN path between DCI borders shows IP routing and BGP, but no UDP 4789 VXLAN traffic during a tenant flow test that should traverse EVPN-VXLAN DCI. What should troubleshooting focus on?
Select an answer to reveal the explanation.
Short Explanation
If the WAN sniff shows zero VXLAN UDP, the overlay trucks are not on that road—even if BGP looks pretty. Verify VTEPs can reach each other, encapsulation is on, and traffic is really steered into the DCI overlay. Control plane green lights are not a data-plane proof.
Full Explanation
Absence of UDP 4789 on the interconnect during an expected overlay flow indicates a data-plane path problem: VTEP reachability, VXLAN configuration, routing to VTEP endpoints, or policy steering. EVPN advertisements alone do not prove encapsulation on the WAN. Changing underlay to RIPv2 or disabling VNIs does not correctly validate EVPN-VXLAN DCI forwarding.