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Hardware, software and feature compatibility and memory requirements


Core Issue

Whenever you install a new card, module or Cisco IOS  Software image, it is important to verify that the router has enough memory and that the hardware and software are compatible with the features you want to use.


To check for hardware and software compatibility and memory requirements, perform these steps:

  1. To choose software for your network device, refer to Software Advisor.

    Choose from one of these options:

  2. To check the minimum amount of memory (RAM and Flash) required by the Cisco IOS Software and download the Cisco IOS Software image, refer to the Cisco IOS Upgrade Planner.
  3. To determine the amount of memory (RAM and Flash) installed on your router, refer to the Memory Requirements section of How to Choose a Cisco IOS Software Release.

    Choose from one of these options:

    • If you want to keep the same features as the version currently running on your router, but do not know which feature set you are using, issue the show version command and paste it in the Output Interpreter tool.
    • To display potential issues and fixes, refer to the Output Interpreter tool. You must have JavaScript enabled to use Output Interpreter. It is important to check for feature support, especially if you plan to use recent software features.
    • If you need to upgrade the Cisco IOS Software image to a new version or feature set, refer to How to Choose a Cisco IOS Software Release.
  4. If you determine that a software upgrade is required, refer to these documents: