An engineer is extending EPG connectivity to an external network. That external network contains the Layer 3 gateway and other end hosts. Which ACI bridge-domain configuration should be used?
A Forwarding: Custom L2 Unknown Unicast: Hardware Proxy L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Enabled B Forwarding: Custom L2 Unknown Unicast: Flood L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Enabled C Forwarding: Custom L2 Unknown Unicast: Hardware Proxy L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Disabled D Forwarding: Custom L2 Unknown Unicast: Flood L3 Unknown Multicast Flooding: Flood Multi Destination Flooding: Flood in BD ARP Flooding: Disabled Show Answer Answer Explanation When the default Layer 3 gateway and hosts reside outside the ACI fabric, the bridge domain must flood Layer 2 unknown unicasts and ARP requests so that unresolved destination MAC addresses and ARP broadcasts can reach the external network. Hardware-proxy mode can drop an unknown unicast when the destination endpoint is not learned in the ACI bridge domain. Cisco documents that Layer 2 unknown unicast flooding floods such traffic within the bridge domain and that enabling ARP flooding floods ARP requests to all bridge-domain interfaces.
Learn more
Community Discussion