ExtremeXOS leverages OSPF to advertise and learn VTEPs dynamically in a VXLAN network. OSPFv2 advertises a triplet of VNI/Endpoint IP Address/Advertising Router ID through OSPFv2 domain using type 11 opaque link state advertisements (LSAs). The OSPFv2 VXLAN LSA link state ID uses opaque type 128. The remaining 24 bits of the field are set to the VXLAN VNI. Each locally configured VNI corresponds to a single opaque LSA advertised by the router. The OSPFv2 VXLAN LSA payload contains one top level TLV which specifies the locally configured IPv4 endpoint address on the advertising router.
The OSPFv2 VXLAN opaque LSA is only advertised if ospf vxlan-extensions is enabled using the enable ospf vxlan-extensions command.
NoteRouters in OSPF network should be capable of transmitting type 11 opaque LSAs defined in RFC5250.