In EVPN-VXLAN, which overlay is described by the term Distributed Overlay?

In EVPN-VXLAN, which overlay is described by the term Distributed Overlay?

• A. EVPN-VXLAN
• B. UBT
• C. GRE
• D. LLDP

Answer: (A)

In EVPN-VXLAN, a distributed overlay means the control and data plane responsibilities are spread across all PE devices in the fabric. Each PE participates in the EVPN control plane (using MP-BGP) to exchange MAC and IP reachability with other PEs, learns where to forward each destination, and uses VXLAN tunnels directly to the destination VTEPs. There isn’t a single central controller handling the entire overlay; forwarding decisions are made locally on each PE based on the distributed routing information. That’s why EVPN-VXLAN itself is described as the distributed overlay. The other options don’t fit this concept: GRE is just another tunneling protocol, LLDP is a neighbor-discovery protocol, and UBT does not describe the distributed overlay model in EVPN-VXLAN.

In EVPN-VXLAN, a distributed overlay means the control and data plane responsibilities are spread across all PE devices in the fabric. Each PE participates in the EVPN control plane (using MP-BGP) to exchange MAC and IP reachability with other PEs, learns where to forward each destination, and uses VXLAN tunnels directly to the destination VTEPs. There isn’t a single central controller handling the entire overlay; forwarding decisions are made locally on each PE based on the distributed routing information. That’s why EVPN-VXLAN itself is described as the distributed overlay.

The other options don’t fit this concept: GRE is just another tunneling protocol, LLDP is a neighbor-discovery protocol, and UBT does not describe the distributed overlay model in EVPN-VXLAN.