In an EVPN-VXLAN multihoming active-active scenario, a Designated Forwarder (DF) is elected per Ethernet Segment (ES) to handle Broadcast, Unknown Unicast, and Multicast (BUM) traffic. The DF is the only device that forwards BUM traffic from the VXLAN core to the multihomed device.

In this case, leaf2 is the DF. When server2 sends a broadcast frame, leaf2 forwards it locally to server1. leaf1 is the non-DF, so it is prohibited from forwarding any BUM traffic received from the core to server1. As an optimization, since leaf1 would drop the frame anyway, leaf2 may not forward the BUM frame to leaf1 at all. Consequently, only leaf2 forwards the frame to server1.

A. The broadcast frame will be forwarded to leaf1 and Ieaf2.

This is incorrect. The frame originates from a server connected to leaf2; it is not forwarded to leaf2. It is also not forwarded to leaf1 due to the non-DF role and potential pruning.

D. Only leaf1 will forward the broadcast frame to server1.

This is incorrect. leaf1 is the non-DF for the Ethernet Segment and is explicitly required to drop BUM traffic for that segment to prevent