![]() Upon receiving an ARP request, the Layer 2 gateway checks whether it includes the host information corresponding to the destination IP address of the packet. The Layer 3 gateway then transmits an ARP route carrying the host information to a Layer 2 gateway. ARP broadcast suppression: After a Layer 3 gateway learns the ARP entries of hosts, it generates host information that contains the host IP and MAC addresses, Layer 2 VNI, and gateway’s VTEP IP address. ARP entry advertisement applies to the following scenarios: This type of MAC/IP route is also called the ARP route. Mask length of the host IP address carried in the route Length of the host MAC address carried in the route Unique identifier of the connection between the local and remote devices To achieve this, the VTEPs function as BGP EVPN peers to exchange MAC/IP routes.Ī MAC/IP route can carry both the MAC and IP addresses of a host, and therefore can be used to advertise ARP entries between To implement Layer 2 communication between intrasubnet hosts, the local and remote VTEPs of a VXLAN tunnel need to learn the host MAC addresses from each other. Flooded traffic on the network is significantly decreased.EVPN can advertise both Layer 2 MAC addresses and Layer 3 routing information.VTEPs are discovered automatically and VXLAN tunnels are established automatically, simplifying network deployment and expansion.Using EVPN as the VXLAN control plane has the following advantages: ![]() By extending BGP, EVPN defines three new types of BGP EVPN routes to implement VTEP autodiscovery and host MAC address learning. EVPN relies on the Border Gateway Protocol (BGP)/MPLS VPN mechanism. To address these problems, Ethernet Virtual Private Network (EVPN) is introduced as the VXLAN control plane. ![]() Although the flood-and-learn approach is much simpler, it causes a large amount of flooded traffic on the network and makes the network difficult to expand. Instead, VXLAN tunnels require manual configuration and host MAC addresses need to be learned through traffic flooding. In the initial VXLAN solution (RFC 7348), the control plane is not defined.
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