Cisco Router and IOS How To's Archives - CellStream, Inc.
Cisco IOS XRv Router Installation and Configuration Guide - Mapping the Cisco IOS XRv Router Network Interfaces to the VM Network Interfaces [Cisco IOS XRv Software] - Cisco Systems
Cisco 800 Series Routers - Cisco
Cisco IOS Explained with Features and Functions
Copy IOS Image To Cisco Router From ROMmon Mode
Cisco Routers: Cisco IOS Modes - YouTube
Hardware Architecture of the Cisco 7500 Router - Inside Cisco IOS Software Architecture (CCIE Professional Development) [Book]