In a Cisco ACI Multi-Pod deployment, the Inter-Pod Network (IPN) provides Layer 2 and Layer 3 connectivity across pods and physical locations. The IPN is a routed network that connects the spine switches of different pods, enabling communication between them. It facilitates the exchange of endpoint information and ensures seamless connectivity across the fabric, even when pods are geographically dispersed.
It is the use of the VXLAN overlay technology in the data-plane that provides seamless Layer 2 and Layer 3 connectivity services between endpoints, independently from the physical location (Pod) where they are connected.
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-737855.html
Nonetheless, the IPN must simply provide basic Layer 3 connectivity services, allowing for the establishment across Pods of spine-to-spine and leaf-to-leaf VXLAN tunnels. It is the use of the VXLAN overlay technology in the data-plane that provides seamless Layer 2 and Layer 3 connectivity services between endpoints, independently from the physical location (Pod) where they are connected.
It's A
At the same time, seamless Layer 2 and Layer 3 connectivity services can be provided between endpoints independently from the physical location where they are connected and without requiring any specific functionality from the network interconnecting the various Pods.
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