Ops brings up EVPN BGP between municipal DCI borders and sees Type-5 prefixes exchanging, yet VXLAN-encapsulated tenant packets never arrive. Underlay ping between border VTEP addresses fails. What is the core issue?
Select an answer to reveal the explanation.
Short Explanation
Control plane up, data plane dead—classic. EVPN can gossip routes all day, but VXLAN still needs an IP path between VTEPs. If underlay ping fails, the tunnel trucks have no road.
Full Explanation
EVPN control-plane success does not imply VXLAN data-plane success. DCI VTEPs require underlay IP reachability so UDP 4789 packets can traverse the interconnect. Type-5 exchange alone cannot prove encapsulation path health; underlay reachability is not optional; abandoning EVPN for flood-and-learn is not the fix.