IOSXE

IOS XE is a family of Cisco network operating systems built as a Linux-based, modular successor to the traditional Cisco IOS. It is designed to run on a wide range of Cisco devices, including campus switches and edge routers, to provide a unified software platform with improved scalability, reliability, and programmability.

The architecture of IOS XE centers on a Linux kernel with multiple processes that handle control plane tasks and device management. This modular design allows features to be added or updated more flexibly and supports enhanced process isolation, easier software maintenance, and better support for automation and telemetry. IOS XE supports standard networking protocols and features such as IPv4 and IPv6 routing, OSPF, EIGRP, BGP, VRF, QoS, MPLS, and VPN services, along with security features and policy-driven networking.

Programmability and automation are core aspects of IOS XE. It offers APIs and interfaces such as NETCONF and RESTCONF, scripting support (including Python), and integration with Cisco management platforms for centralized policy and telemetry. These capabilities enable automated provisioning, monitoring, and configuration, contributing to modern network operations.

IOS XE is widely deployed across various Cisco platforms, particularly in Catalyst switches used in campus and branch deployments and in several router families for WAN edge and aggregation roles. Its ongoing development emphasizes programmability, security, and scalable performance to support evolving enterprise and service-provider networking needs.