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Routing & Switching · Intermediate

Flood and Learn

The original VXLAN data-plane learning model in which BUM traffic is flooded through multicast and remote MACs are learned from received packets.

Definition

Without a control plane, each VTEP learns MAC-to-VTEP mappings by observing decapsulated traffic. It requires multicast in the underlay and does not scale well. BGP EVPN replaced it with control-plane learning.

Example

member vni 10010 mcast-group 239.1.1.10 without BGP EVPN

Exam tip

Flood and learn = data-plane learning; EVPN = control-plane learning.

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