Prior to EVPN, VXLAN overlaynetworks operated using the flood and learn model. In this model, end host information learning and VTEP discovery are both data plane based, with no control protocol to distribute end host reachability information among VTEPs.
To overcome the limitations of the flood-and-learn VXLAN as defined in RFC 7348, organizations can useMultiprotocol Border Gateway Protocol (MP-BGP) Ethernet Virtual Private Network (EVPN) as the control plane for VXLAN.
VXLAN L2 Gateway
• VTEP capable of switching VLAN->VXLAN, VXLAN->VLAN packets with in same VNI.
VXLAN L3 Gateway
• VTEP capable of routing packets across different VNIs.
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