nt aspects of next-generation products and services. While this topic is explored in detail in Chapter 6, this section will discuss some of the key problem statements related to the enterprise network, from the standpoint of exist- ing management models, and provide insight into new solutions. Enterprise Networks 10.4.1 CALL HOME FUNCTION One of the biggest pain points for enterprise IT administrators today is the planning and logistics involved with the roll out of new network appliances or the replacement of older appliances. Today, not only is this process largely manual and complex but also takes many weeks and sometimes months to execute. As the industry started focusing on network simplification, a variety of solutions emerged to solve these issues. These solutions are often referred to as a Call Home service (also referred to as Phone Home Service, Zero Touch Provisioning, and Plug-n-Play). Each of these solutions is mainly focused on avoiding truck-rolls needed for appliance installation. While there are multiple solutions in the market, each solution often uses a proprietary approach. We do have Internet Engineering Task Force (IETF) drafts* that provide a secure and standard-based approach to connect with a newly deployed device, and configure it with the appropriate feature-set required for the service. 10.4.2 Data MODELING FOR NETWORK DESIGN Today, the network design process is centered on a set of documents-the network requirements and design documents that contain a variety of information such as high-level network architecture diagrams, low-level detailed designs, and specification of what features are enabled and sometimes, examples of how those features can be enabled. One of the common issues encountered is identify- ing the best way to configure the network and maintaining the configuration over a long time period. This is especially challenging in multivendor environments and sometimes with different products from the same vendor, mainly because of different configuration interfaces to configu