Upgrading Multiple Cisco IOS Routers

This chapter offers an exploration of upgrading multiple Cisco IOS routers and delves into Python Network Automation through the lens of real-world scenarios. It begins with an examination of object-oriented programming (OOP) applied in networking, followed by proactive patch management strategies and discussions on Zero Trust approaches to strengthen network security. This chapter guides readers through a hands-on experience in creating virtual routers for IOS upgrade tasks in subsequent chapters, utilizing Cisco Catalyst 8000v IOS XE software. It covers the software's download, installation on VMware Workstation, and a detailed discussion of the intricate process of upgrading IOS (XE/XR) on Cisco devices. Additionally, it outlines the tasks integral to a Cisco IOS upgrade process. This chapter culminates with a comprehensive summary that encapsulates the key learnings and insights from the entire chapter.