Unknown unicast packet
flooding (UUFB) limits unknown unicast flooding in the forwarding path to
prevent the security risk of unwanted traffic reaching the Virtual Machines
(VMs). UUFB prevents packets received on both vEthernet and Ethernet interfaces
destined to unknown unicast addresses from flooding the VLAN. When UUFB is
applied, Virtual Ethernet Modules (VEMs) drop unknown unicast packets received
on uplink ports, while unknown unicast packets received on vEthernet interfaces
are sent out only on uplink ports.
After you disable unknown unicast packets globally, you can allow
unicast flooding on either a single interface or all interfaces in a port
You can also configure
an interface or a port profile to never allow unknown unicasts to be blocked.