Dynamic Learning

Dynamic learning of remote MACs involves:
VXLAN supports standard and explicit-remotes flooding modes:

Additionally the MAC-to-remote IP binding is added to the filtering database associated with the VNI‘s overlay network. The received encapsulated frame can either be addressed to the VTEP directly (in the case of known unicast) or to a multicast group that the VTEP joined.

Gateways will need to age remote VTEPs as done with MAC-to-IP bindings to ensure that the number of remote VTEPs does not remain monotonically non-decreasing over time.

A VM‘s MAC-to-IP binding may change if it has been migrated using Vmotion. As with FDB learning, VTEPs need to dynamically detect these moves based on received traffic and update their filtering databases.