I need to update the IOS on a Cisco CGS2520 Switch. Not stacked, single switch

I have never done this before and I have a couple questions.

I do not have physical access to the switch.

Looking at the list of downloads for that switch


There are 4 options, which one would I want, how would I know?


It says 15.2.7E2(MD) is the recommended. I am currently running 15.0(2)ED1.

Boot loader is Version 12.2(0.0.8)EY not sure what that is, does that need to be upgraded as well?

I have googled around and found the step to add the image via tftp, and install however:

  1. Will the switch reset? Will I still be able to access it? Currently accessed via SSH through a VPN

  2. If I enter the "reload in 20" command, and everything goes down, will the switch still reload in 20 minutes? Some of the articles I have read say I would need to wr mem and reboot the switch. Is there a failback procedure?

  • 1
    "There are 4 options, which one would I want, how would I know?" That depends on the services you need. You need to compare the features you want with those offered by the different licenses. In fact, you should know all that before deciding to upgrade the software (why you want to upgrade), and be familiar with the bug scrub of the code you want. Upgrading just to upgrade is not really something you want to do.
    – Ron Maupin
    Aug 27, 2021 at 13:23
  • 1
    Removed the off-topic request for resouce recommendations.
    – Ron Maupin
    Aug 27, 2021 at 13:24
  • @RonMaupin Is there a way I can tell what I am currently running from the 4 options? I need to upgrade because the IOS on the switch is showing multiple vulnerabilities, that according to Nessus can only be fixed via and IOS upgrade. Aug 27, 2021 at 13:30
  • 1
    It sounds like you should be working with Cisco TAC. No offense, but it sounds like you are in over your head.
    – Ron Maupin
    Aug 27, 2021 at 13:48
  • 1
    Just call Cisco TAC. They help with bugs and vulnerabilities.
    – Ron Maupin
    Aug 27, 2021 at 14:07


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