Cisco IOS
- Most common and legacy Operating System
- Written using C programming language
- Does not support symmetric multiprocessing
- Use of shared memory space
- Cisco IOS-XE is an extension of Cisco IOS
Cisco IOS-XR
- Found on Cisco service provider routers
- 64 bit architecture
- Symmetric multiprocessing
- Seperate memory spaces
- Modular services
- Built of Linux kernel
- Somewhat similar to Cisco IOS
Cisco NX-OS
- Found on Cisco Nexus switches located in data centers
- Feature based licensing model
- All Ethernet interfaces are called Ethernet. The FastEthernet, GigabitEthernet, TenGigabitEthernet interface naming conventions no longer exist
- Default login administrator user is admin. It is no longer possible to login with just a password
- Supports Checkpoint & Rollback feature (configuration and violation check)
- EtherChannel(IOS) naming convention has been replaced by Port-Channel
- Seperate memory spaces
- Symmetric multiprocessing
- Built of Linux kernel
- Multiple High Availability features
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