In Cisco ACI, when a packet is routed between two endpoints on different leaf switches, the VXLAN VNID that is applied to the packet corresponds to the Bridge Domain (BD). The BD VNID is used to encapsulate the packet for Layer 2 transport across the fabric. This VNID ensures that the packet is delivered to the correct bridge domain, maintaining the segmentation and policy enforcement required by the ACI fabric.
References :=
Cisco ACI Fabric Forwarding White Paper
Cisco ACI Basic Configuration Guide
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