Ops asks which EVPN architecture most often avoids hairpinning east-west inter-subnet traffic up to the spine. What should the engineer answer?
Select an answer to reveal the explanation.
Short Explanation
Hairpinning is the long trip uptown just to turn around — CRB often does that for inter-subnet east-west. ERB lets the leaf route locally so hosts next door do not need the spine detour. Killing L3 VNIs or cloning VNIs does not fix the path.
Full Explanation
In many CRB deployments, inter-subnet east-west traffic is routed at a central IRB on the spine/border, which can hairpin through the fabric core. ERB places routing on the leaf so same-leaf or local inter-subnet forwarding can complete without that central detour. Removing L3 VNIs or forcing identical VNIs does not provide the distributed routing benefit.