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Enabling ARP flooding is necessary when VMs are migrated from a pre-existing network to Cisco ACI and their gateways remain in the legacy setup. This allows the ACI fabric to learn about silent hosts that do not initiate communication, ensuring that the migrated VMs can communicate with all hosts in the network, including those that are silent.

In Cisco ACI, Virtual Routing and Forwarding (VRF) instances are used to create separate routing tables for network traffic management. An unenforced VRF does not apply policies or contracts for communication between endpoints, allowing free communication without the need for explicit permissions. By implementing an unenforced VRF in the common tenant and mapping all required Bridge Domains (BDs) to it, each department’s BDs can communicate with one another without configuring contracts or VRF route leaking, thus meeting the company’s requirement for redesigning their networking architecture. References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

To enable SSH communication between Web_EPG (Web Endpoint Group) and App_EPG (Application Endpoint Group), it’s necessary to apply a configuration that allows bidirectional communication while not restricting ports based on their directionality. By enabling “Apply Both Directions” and disabling “Reverse Filter Ports,” this ensures that the filter allows SSH packets to flow from Web_EPG to App_EPG and vice versa without any restrictions based on the port’s direction, which is essential for establishing an SSH session. References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )