When comparing VXLAN control planes, EVPN (Ethernet VPN) offers significant advantages over a multicast-based approach. EVPN uses BGP to distribute MAC address and VTEP reachability information, which is highly scalable, enables fast convergence upon network changes, and supports advanced features like MAC mobility. In contrast, a multicast control plane relies on data-plane flood-and-learn, which requires manual mapping of VNIs to multicast groups and is less agile and scalable. While both methods ultimately facilitate MAC learning (EVPN via control-plane and multicast via data-plane flooding), EVPN's approach is far more efficient for modern data centers.

A. EVPN is inefficient and does not scale well.

This is false. EVPN was specifically designed to overcome the scaling and efficiency limitations of older technologies like VPLS and multicast-based VXLAN.

E. Multicast does not require as many resources.

This is misleading. While it avoids a BGP control plane, it requires PIM state and multicast forwarding entries on all VTEPs, and the associated flooding can consume significant bandwidth.

1. Juniper Networks Documentation, EVPN User Guide, "EVPN-VXLAN Overview". "EVPN provides a scalable, efficient, and robust solution for Layer 2 and Layer 3 connectivity in a data center... Compared to using a multicast model for BUM traffic forwarding, EVPN is more efficient."

2. Juniper Networks Documentation, Understanding EVPN with VXLAN Data Plane Encapsulation. "In a multicast-based VXLAN deployment, you must manually configure the VNI-to-multicast-group mapping on each VTEP. This approach is not agile... EVPN solves these issues by providing a control plane that advertises MAC addresses."

3. Juniper Networks White Paper, Data Center Fabric with EVPN and VXLAN. "EVPN provides a control plane for VXLAN that allows VTEPs to learn about remote MAC addresses and VTEPs before they need to forward traffic... This control plane approach is much more scalable than the data plane flood-and-learn approach used with multicast."