Sunday, April 01, 2007

Cisco Tip: Saving Configuration Changes (CatOS vs IOS)

If you are going to be spending a lot of time working with routers and switches, probably the most important thing you need to know is - HOW TO SAVE WHAT YOU ARE DOING!

Let's take a look at how you save your work on routers (and/or switches running IOS) and switches (CatOS):



If make a change on a router or a switch running IOS, you need to enter the copy run start or write memory command in order for the configuration to be saved to NVRAM.



If you make a change on a switch running CatOS, however, it is immediately written to NVRAM.

This is an important distinction and one about which you should be aware when working with these devices.


At 11/14/2008 12:28:00 PM, Anonymous Anonymous said...

The comments on CatOS are incorrect. After I make a change on our 6500, there is a diffence between the run and start. When I entered reload, it asked me to save. I pulled the power and after reboot my changes were not saved.

At 11/14/2008 03:53:00 PM, Blogger rdauman said...

Thank you for your comment and I am sorry to hear that you had issues. With CatOS, configuration changes are saved automatically to NVRAM. It should be understood that CatOS refers to L2 switches. From what you have described, it seems that your 6500 is a L3 switch, as you are running the "show run" command and not the "show config" command as you would on a L2 CatOS switch. L3 switches and routers don't automatically save their configurations to NVRAM and, thus, you need to perform the "wri mem" command. I hope this helps!


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