Explore how Deutsche Telekom tackled the challenge of implementing Kubernetes at scale in a complex on-premises environment through this conference talk. Dive into the intricacies of creating a network fabric for bare-metal Kubernetes cloud that supports internal Cluster-as-a-Service offerings. Learn about the obstacles faced when dealing with legacy networks and historically grown, segmented networks with overlapping VRFs in a telco context. Discover innovative solutions, including IP fabrics, traffic flow optimization, and host integration into the fabric. Gain insights into making the network stack telco-ready for demanding applications like 5G core. Understand the implementation of VXLAN, network connectivity from the host, and the role of network operators and iNetplanner. Explore caveats and conclusions drawn from this groundbreaking project that reimagines network architecture for large-scale Kubernetes deployments in telecommunications environments.