When a router/switch stuck in ROMMON mode, the first thing you need to check is the configuration register value. You might have experienced this before, or in case you find this problem in the future, lucky you got in this post. This is not a serious problem, I only forgot to change back the configuration register value. It's not showing the normal switch > prompt but only the rommon 1 > prompt. Then the problem came, one of the switches stuck in the ROMMON mode.
So I upgraded the image to IOS, I had to change several switches since they were using quite a lot of those switches. Meaning when you want to configure something the command usually use "set" as the first command. CatOS is another flavor of Cisco Operating System which uses a set based commands. The thing is it was using CatOS instead of IOS, the client only want to use IOS.
One time in a project, I worked on Cisco Catalyst 6500 series, it's one of the biggest switches you can find in the market, not to mention very expensive too.
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