Cisco IOS, IOS-XR, and NX-OS comparison

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

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Top 4 commands you should know on Cisco FTD

From architecture perspective, Cisco ASA and FTD (Firepower Threat Defense) operate in different ways. ASA operate at Layer 3/4, whereas FTD operate at Layer 7. Even the CLI behaves in such different ways. So, will look at most important commands which are to be used on Cisco FTD devices.

01. CLI mode for Advanced troubleshooting

By default, you will see something like this.

But in order to run additional commands, you will have to access the CLI. In order to access the CLI, you can simply execute the command system support diagnostic-cli

02. Firepower eXtensible Operating System (FXOS) CLI

On Firepower 2100, 4100, and 9300 series devices, FXOS is the operating system that controls the overall chassis. Depending on the model, you use FXOS for configuration and troubleshooting. From FXOS, you can enter the Firepower Threat Defense CLI using the connect ftd command.

you may either use connect ftd or connect fxos

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