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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

An application-centric design in Cisco ACI focuses on the application requirements and interactions between different application components. In this design, EPGs (Endpoint Groups) represent different application tiers, such as web, application, and database tiers. This approach allows for a more flexible and scalable network configuration that aligns with the application architecture, enabling policies to be applied based on the application’s needs rather than the network topology. References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

In an ACI setup, to advertise a default static route from L3Out-1 to another L3Out using OSPF, the Aggregate Export Subnet feature must be enabled. This allows for the summarization and advertisement of routes, including the default route, to external networks via OSPF.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

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 )

The Forwarding Tag (FTAG) in Cisco ACI is used to load balance multi-destination traffic. FTAG trees facilitate efficient forwarding of multicast traffic within the fabric, ensuring optimal distribution and load balancing across multiple paths. All multi-destination traffic isencapsulated within VXLAN, and FTAG trees play a crucial role in achieving efficient traffic flow345.

References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

In a Cisco ACI multisite setup, symmetric ingress and egress traffic flows for stretched bridge domains are essential for consistent network behavior. Configuring host route advertisement on the bridge domains allows each site to advertise its local endpoints’ routes. This ensures that return traffic is directed to the originating site, maintaining symmetric traffic flow. When host routes are advertised from the bridge domains, it allows for more granular control of traffic, ensuring that packets take the same path into and out of the network, which is particularly important in stretched scenarios whereapplications might span multiple sites. References := ( Implementing Cisco Application Centric Infrastructure Official Cert Guide )

To redirect HTTP traffic between an EPG client and EPG server through a Cisco ASA firewall in a Cisco ACI environment, a contract filter must be configured to allow both ARP and HTTP. ARP is essential for IP to MAC address resolution, which is necessary for layer 2 communications within the same subnet or across subnets when routing is involved. The HTTP filter ensures that only HTTP traffic is redirected to the firewall for inspection or policy enforcement. References: Implementing Cisco Application Centric Infrastructure Official Cert Guide

Removing pre-existing Fibre Channel over Ethernet (FCoE) configurations from Nexus devices is necessary to ensure compatibility with Cisco ACI mode. FCoE configurations are not supported in ACI mode, and their presence can hinder the migration process2.

For intra-VRF transit routing between two external routers in different OSPF areas, OSPF virtual links are required. They connect non-contiguous areas to the backbone area, ensuring all areas can communicate even if not directly connected.

References := Implementing Cisco Application Centric Infrastructure Official Cert Guide

When a packet is routed between two endpoints on different Cisco ACI leaf switches, the VXLAN VNID applied to the packet is the VRF (Virtual Routing and Forwarding) VNID. This VNID enables forwarding of the packet through tenant virtual routing and forwarding domains within the fabric34.

References := Cisco APIC Layer 3 Networking Configuration Guide, Release 3.x and later