Cisco 300-630 - Implementing Cisco Application Centric Infrastructure - Advanced (DCACIA)

 In a Cisco ACI Multi-Site setup, the ISN (Inter-Site Network) connects different ACI sites. For efficient multicast traffic routing, BIDIR-PIM (Bidirectional Protocol Independent Multicast) is configured throughout the ISN, which is why option B is correct. Increasing the ISN MTU (Maximum Transmission Unit) to support the maximum MTU sent by endpoints is crucial to prevent packet fragmentation or loss, making option C correct.

Options A, D, and E are not typically required for an ACI Multi-Site setup. Direct connectivity between Spine switches and ISN routers, as mentioned in options A and D, is usually established through leaf switches. Option E, enabling IGMPv3 on ISN routers, is more relevant for managing multicast subscriptions within a single site.

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 )

Graphical user interface Description automatically generated

 To advertise the 172.16.2.0/24 network learned from L3Out OSPF out of the fabric via EBGP, a subnet must be created within the L3Out’s External EPG and marked as “Shared Route Control Subnet.” This setting allows the route to be advertised to external routers through EBGP.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

In a Cisco ACI Multi-Site deployment, proper configuration of the inter-site link is crucial for traffic to pass between different sites. The MTU size is particularly important; if it’s not set correctly, packets may be dropped or fragmented, leading to connectivity issues. By configuring the MTU on the link to be at least 100 bytes larger than that of the ACI fabrics, you allow for encapsulation overhead without packet drops due to exceeding MTU limits. Additionally, configuring the link as a routed subinterface using VLAN-4 is necessary for routing across different broadcast domains, which is essential for inter-site communication in an ACI fabric. References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

In a two-site Multi-Pod deployment with an active/standby firewall pair stretched across pods, traffic is directed to the pod with the active service node. This approach ensures that all traffic goes through the firewall that is currently handling traffic, maintaining security policies consistently across both sites while also providing high availability by automatically failing over to the standby firewall in case of any issues with the active one. References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )

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

To facilitate communication between EPG1 in VRF1 and External EPG in VRF2, the following actions are necessary:

Enable Shared Route Control Subnet: This allows subnets to be shared across different VRFs, which is essential for inter-VRF communication.

Enable External Subnets for External EPG: Activating this makes the subnets within the External EPG routable to external networks.

Enable Import Route Control Subnet: This enables the importation of routes from L3Out into the VRF, permitting connectivity between different VRFs.

These steps ensure that routing and security policies are correctly implemented to permit traffic flow between EPG1 and External EPG across distinct VRFs.

References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

The design approach shown in the exhibit is application-centric. This model focuses on the application requirements and defines network policies based on the needs of the application rather than traditional network constructs. It allows for a more dynamic and flexible network configuration that aligns with the application’s behavior and interactions.

The configuration set that accomplishes the goals of allowing communication between the external subnet and internal EPG1, as well as leaking L30ut traffic into VRF named “VF1”, is option D: Export Route Control Subnet Import Route Control Subnet Aggregate Shared Routes. This configuration ensures that routes are properly exported from one entity and imported into another while aggregating shared routes for efficient routing within the VRF “VF1”. It allows for controlled route leaking which is necessary for communication across different entities within a Cisco ACI environment. References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )