Endpoint Dataplane Learning
--> By Default, In Cisco ACI learns the Endpoint IP and MAC address by observing the data traffic going through the Leaf Switch.
--> We can disable this behavior by changing the setting in Bridge Domain Configuration.
--> If you disable the Endpoint Dataplane Learning Feature under Bridge Domain, It also disables the "Limit IP Learning To Subnet" Option.
--> By default, the Endpoint Dataplane Learning feature is disabled on the service node where the L4-L7 Device is connected and the service graph is implemented.
--> If you are using APIC version 3.0 or earlier then you have to manually disable this option by going under the bridge domain.
--> If you enable this feature under Bridge Domain where Service Graph PBR is configured, It gonna create unwanted traffic blackholes.--> We can disable "Dataplane Learning" Per Bridge Domain/Subnet/EPG/VRF.
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739989.html#EndpointDataplaneLearning
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