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To enable communication between the external subnet and internal EPG1, and to allow L3Out traffic to leak into the VRF named “VF1”, the following configuration set should be used:

External Subnets for External EPG: This configuration defines the subnets that are external to the ACI fabric but need to be reachable from within the fabric. It is necessary to specify which subnets are to be considered part of the L3Out1.

Shared Route Control Subnet: This setting allows the subnets to be shared across different VRFs, enabling communication between EPGs that are in different tenants but within the same VRF1.

Shared Security Import Subnet: This configuration ensures that the security policies (contracts) associated with the shared subnets are also imported, allowing for the necessary traffic to flow between the internal and external endpoints1.

By applying this configuration set, the external subnet and internal EPG1 will be able to communicate, and the L3Out traffic will be properly leaked into the designated VRF, meeting the specified goals.

References :=

ACI Inter VRF/Tenant Route Leaking Configuration Example1

When deploying a new Cisco ACI Multi-Pod setup, it’s crucial to ensure that the Tunnel Endpoint (TEP) pool of the new pod is routable across the Inter-Pod Network (IPN). This allows the TEP addresses to be reachable across the pods, facilitating communication between them. Additionally, increasing the Maximum Transmission Unit (MTU) for all IPN routers is necessary to support the larger frame size required by VXLAN encapsulation, which is typically above the standard Ethernet MTU of 1500 bytes.

References :=

Cisco ACI Multi-Pod Configuration Guide

Cisco ACI Best Practices Guide