This book provides the reader with detail about the SR-OS implementation of BGP and how it can be used to provide infrastructure layer transport as well as being an enabler for services. In parallel these need to be provided with a sufficient level of protocol robustness, a high level of scalability, and the ability to re-converge quickly upon failure.For each feature/function that is covered an overview is provided of what the feature/function is, how it operates (using command line interface and debug outputs to aid that understanding), and how it is configured, along with configuration examples. The book is intended for IP design and engineering communities. It is written as a one-stop reference on how to implement and configure a particular service and/or function. the basic operation of BGP as a path vector protocol is not discussed as it is assumed to be a pre-requisite.