After a city enables Layer-2 stretch DCI, ARP floods are observed crossing the WAN. What BUM impact should operators expect from L2 stretch?
Select an answer to reveal the explanation.
Short Explanation
Once L2 stretch is on, BUM and ARP can hitch a ride across the WAN unless EVPN controls rein them in. Expect that behavior; design for it.
Full Explanation
Layer-2 stretch DCI can forward broadcast, unknown unicast, and multicast—including ARP—across the interconnect unless EVPN proxy-ARP, ingress replication controls, or related mechanisms limit it. Operators should expect BUM impact on constrained WAN links and design mitigations accordingly. Assuming ARP never crosses is incorrect for unmanaged L2 stretch.