An engineer configured Layer 2 extension from the ACI fabric and changed the Layer 2 unknown unicast policy from Flood to Hardware Proxy. How does this change affect the flooding of the L2 unknown unicast traffic?
A.
It is forwarded to one of the spines to perform as a spine proxy.
B.
It is flooded within the whole fabric.
C.
It is dropped by the leaf when the destination endpoint is not present in the endpoint table.
D.
It is forwarded to one of the APICs to perform as a proxy.
A is correct.
Hardware proxy for Layer 2 unknown unicast traffic is the default option. If the destination MAC is not in the ingress leaf endpoint table, the packet is sent to the spine proxy. This forwarding behavior uses the COOP database on spine switches to forward unknown unicast traffic to the destination leaf without relying on flood-and-learn behavior, as long as the MAC address is known to the COOP database on spine switch.
If MAC address of an endpoint is unknown to spine COOP database (for example, silent host), the spine drops the packet.
A is correct. Hardware proxy instructs to the leaf to send the unknown unicast packet to the spine which will check the mac address of the endpoint in its coop table.
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