I need to view POST details on Cisco 1841 Routers and Cisco 2950 switches.

I have tried show post and show diagnostics post. However, both these commands are not available.

What is the command that needs to be used?

Thank you for your time!

  • 2
    What specific trouble are you trying to diagnose with this information? I'm not easily finding a way to retroactively view the detailed POST info on the 1800 routers. I'm going to try a 2950 shortly, but I have no great hope for that either. If you can tell us the specific issue you're trying to diagnose, we may be able to offer other helpful solutions/suggestions. Commented Apr 14, 2014 at 12:45
  • @BrettLykins Thanks for looking into this. I am not trying to diagnose any particular issue. We were asked to view the POST details for these devices as a part of a university assignment. However, we are not able to find any commands for this. Thank you for your time!
    – thilina R
    Commented Apr 14, 2014 at 15:24

2 Answers 2


show post should work on the Catalyst 2950, maybe you need to upgrade to a newer version of IOS? Even if it works, it won't display more than "Pass" or "Fail".

For the 1841, I don't think there is a command to show post information.

For Cisco IOS, the equivalent command is show diagnostic which was introduced in 12.1(11b)E for the Catalyst 6000 series and show diagnostics(with an s) which was introduced in for the Catalyst 4000 Series. Both commands display Power-On Self Test (POST) results. For Cisco IOS on the 2900/3500XL, 2950/2955, 3550, 2970 and 3750 series switches, the equivalent command is show post which displays the results of the switch POST.

Note: For Catalyst 3750, 3550, 2970 , 2950/2955, and 2900/3500XL Series switches use the show post command, which indicates a simple pass or fail for the hw status. Use the LEDs on these switches to help you understand the POST results.

  • I was trying this in Packet Tracer. Maybe thats what caused it not to work. However, this is really helpful. Thanks!
    – thilina R
    Commented May 7, 2014 at 7:24

"show diagnostic post" should work on the switch, not sure about 1841.

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