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 In Cisco ACI, contracts define the policies for communication between EPGs (Endpoint Groups). For a client in WebClient EPG to establish an HTTP connection toward a server in WebServer EPG, the contract must allow the initiation of communication from WebClientto WebServer. Since HTTP uses port 80, the destination port (DST Port) should be set to 80 as per standard HTTP communications. The option “Apply Both Direction DISABLED” means that only the initiator of the connection (in this case, WebClient EPG) can send traffic unless specified otherwise by another contract or filter. The “Reverse Port Filter ENABLED” allows return traffic from WebServer EPG back to WebClient EPG on dynamically allocated source ports used by WebClient when initiating the connection. This combination ensures that clients can initiate an HTTP request and receive responses from servers. References: = Implementing Cisco Application Centric Infrastructure Official Cert Guide

 In a Cisco ACI Multi-Site setup, the source leaf is responsible for flooding BUM (Broadcast, Unicast, and Multicast) traffic to the specific multicast group or GIPo (Group IP Overlay). This process involves the ingress replication function on the spine nodes of the source site to replicate BUM traffic to all remote sites where the bridge domain is stretched12.

References := Cisco ACI Multi-Site Architecture White Paper, ACI Multi-Site Data Plane Communication - DCLessons

For fabric discovery to be successful for the nodes in Pod 2, the engineer should configure POD 2 Data Plane TEP under the Pod Connection Profile. This action establishes the necessary data plane tunnel endpoint for communication between the pods. References := Troubleshoot ACI Fabric Discovery - Multi-Pod Discovery - Cisco, Which action should be taken for fabric discovery to be successful for…

 To meet the requirements specified, two actions must be taken: B. Create a standard contract between EPG 51 and EPG 10 to explicitly allow communication between these two EPGs. A contract in Cisco ACI defines the communication policy between EPGs, and by creating a standard contract, specific communication can be permitted. E. Enable the Preferred Group option on EPGs 1 to 50 to allow communication within this group of EPGs. The Preferred Group feature in ACI allows all EPGs within the group to communicate with each other without the need for explicit contracts, while still enforcing contracts for communication with EPGs outside the group. References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

 For a Cisco ACI leaf switch to correctly learn the remote endpoint MAC, the VXLAN packet received from the Cisco ACI spine must include bridge domain information. The bridge domain contains the Layer 2 forwarding context, which allows the leaf switch to learn and associate the MAC address with the correct bridge domain3.

References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )

To create an exit point from all the tenants using the common tenant after removing RT-2 and RT-3 devices, the following two configuration tasks must be completed:

Update L3Out ExtEPG Subnet: The L3Out ExtEPG subnet in the common tenant should be updated with the flag “Shared Route Control Subnet” and “Aggregate Shared Routes” (Option C). This configuration allows for the sharing of routes between different tenants through a common exit point.

Mark Subnets and Attach Contract: All subnets should be marked with the flag “Shared between VRFs,” and contract Ctr-3 should be attached as a provider to all the EPGs (Option D). This ensures that all EPGs can provide services under contract Ctr-3 across different VRFs, facilitating inter-tenant communication via shared routes. References := (Implementing Cisco Application Centric Infrastructure Official Cert Guide)

Cisco ACI handles MSTP TCN frames by flushing local endpoints in the affected EPG to prevent stale entries. For MST BPDUs to traverse the ACI fabric, a dedicated EPG for the native VLAN with static bindings is required for MSTP-enabled external switches. 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 )

In a network-centric design within Cisco ACI, there is open communication between EPGs, and a bridge domain typically has one subnet and one EPG. This design is often used for initial migrations and is based on traditional networking concepts.

References := Network Centric to ACI Centric Migration - Cisco

The integration of service nodes in transparent mode with a Cisco ACI Multi-Pod setup is achieved by using an active-standby firewall mode stretched across pods. This configuration ensures that the standby node takes over if the active node fails, providing high availability and seamless operation. References := Cisco ACI Multi-Pod and Service Node Integration White Paper