Complete 300-620 Cisco Materials

o protect the ACI fabric from spanning-tree loops, the feature that must be enabled on the ACI leaf ports is BPDU Guard 

 To allow multiple external networks to communicate with internal ACI subnets and assign the prefix to the class ID of the external Endpoint Group, the engineer should configure subnets with the External Subnets for External EPG flag enabled1. This configuration allows the specified subnets to be associated with an external EPG, which facilitates communication between internal tenants and external routed networks via L3Outs1.

To prevent frequent MAC and IP address moves between different leaf switch ports, enabling rogue endpoint control is the recommended action. This feature helps in identifying and mitigating the movement of endpoints that could potentially cause loops or other issues within the network.

In Cisco ACI, when a service graph is deployed under one tenant (e.g., Operations) and needs to be referenced by another tenant (e.g., Management), the Layer 4-Layer 7 (L4-L7) device export action is used. This allows the firewall or other L4-L7 devices defined in the service graph to be shared across tenants. By exporting the L4-L7 device, the configuration enables the Management tenant to reference and use the firewall deployed in the Operations tenant.