A county EVPN-VXLAN fabric must move traffic between two different tenant subnets on different VNIs. Which data-plane path concept applies?
Select an answer to reveal the explanation.
Short Explanation
Different subnets are different neighborhoods—bridging alone won’t get you there. The leaf’s IRB is the on-ramp to an L3 VNI that routes between those overlay networks. Think city street to highway to another street, not one endless hallway.
Full Explanation
Inter-subnet traffic in an EVPN-VXLAN fabric uses integrated routing and bridging. Hosts remain on L2 VNIs for their subnet; IRB interfaces provide the gateway, and an L3 VNI carries routed overlay traffic between VTEPs. Spines usually forward outer underlay packets rather than extending tenant STP. Designing only L2 VNIs without IRB/L3 VNI leaves no correct routed overlay path between the county’s subnets.