Saturday, December 14, 2019

Networking-Cisco IOS vs Cisco IOS XE

  • Cisco IOS is monolithic operating system running directly on hardware.
  • Cisco IOS XE is a combination of a Linux kernel and a monolithic application IOSd that runs on the top of this kernel.
  • Cisco IOS XR is based on QNX - since version 5.0 is also based on Linux. 
  • IOSd application has been separated into many applications. While IOS XE(IOSd) and Cisco IOS share a lot of the same code. But cisco IOS XR is completely different code base. 
  • Cisco IOS XE has IOSd running as a application on top of Linux, also it able to run different applications on the hardware. Best example for this is running wireshark on a switch. Also Cisco IOS XE is open service containers. 
Hill Station view:

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