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What is the key difference between IOS, IOS-XE and IOS XR for cisco devices ?

What is the key difference between IOS, IOS-XE and IOS XR for cisco devices ?

ninja
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Answers

The key differences between IOS, IOS-XE, and IOS XR

  • IOS (Classic):
    Monolithic kernel architecture.
    Shared memory space.
    Traditional Cisco operating system.
    Widely used in older Cisco devices.
  • IOS-XE:
    Combines a monolithic application with a Linux kernel.
    Shares code with IOS but offers advanced features.
    Allows running additional applications alongside IOS.
    Commonly found in newer Cisco devices.
  • IOS XR:
    Based on the QNX operating system.
    Segments ancillary processes into separate memory spaces.
    Ensures stability by isolating processes.
    Used in high-end routers and carrier-grade equipment.

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