![]() ![]() In my case, it's a 1841 router, as you can tell from the image file name. Everything you see above is needed to be able to download the image. ![]() It's mandatory to specify a gateway value. ![]() During the troubleshooting process, at this stage usually your laptop is within the same subnet with the intended network device, so most people would think a default gateway is not needed. Use the environmental variables seen above and give them reasonable values. So fire it up, have your IOS image handy, and start typing: But I assume you already have one, most network admins have their favourite tftp server configured on their laptops exactly for cases like this. That's right, you'll need a tftp server too. By moving on, I mean downloading an IOS image from your tftp server. ![]() In this very case, you need to give a value to several environmental variables, to be able to move on. Environmental variables are present on windows too, but most people just never notice them. The solution is called environmental variables, and most linux / unix geeks are familiar with them. Being stuck in rommon in case of a production device is definitely a showstopper (I learned this phrase back in 2007 when I was working with an airline, it comes from Queen's famous song about how the show must go on). Second: none of the normal functions of the network device are working. One is very obvious: the prompt will say: rommon (and a number). You will immediately be able to tell if you're stuck in rommon, because of two things. This is a pre-booted state in which you have a limited number of options and only a subset of the normal commands to use. When there is no IOS to load, the network device will stay in rommon. Some network admins never have to deal with it, but most have to. It's Cisco's OS for switches, routers, load balancers and many more. Where to go from here? Afraid no more, lone netwok warrior, here is the solution.įirst and foremost, IOS has nothing to do with Apple, it's short for Internetworking Operating System. But what if there is no IOS, just a blank flash memory? This could happen if things have gone bad (someone erased something), or you just ordered a new, empty flash and powered down the router. Most people just order stuff from Cisco, opens the box, installs the fresh & new kit into the rack, poweres on and watches the IOS to load. ![]()
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