What is Cisco IOS-XR?

Cisco IOS XR is a modular, distributed, and highly available operating system primarily used in Cisco's high-end network routers, particularly in service provider environments. It's designed for demanding applications such as core routing, service aggregation, and data center interconnect. IOS XR emphasizes scalability, fault tolerance, and operational efficiency through features like modular software components, process restart capabilities, and a robust command-line interface (CLI) and programmatic interfaces.