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Cisco 1721 router problem

How can i exit from the rommon mode on cisco 1721 router

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  • raveesh Apr 14, 2008

    Dear team,



    i changed the register value as per your instruction ,but still the router in rommon mode ,i hope the problem with ios ,if the router dont have valid ios image how can load a valid ios image in to flash memory ?



    thanks and regards

    raveesh.p

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  • 221 Answers

Does the router boot to rommon mode everytime you turn it on?

There are two reasons why the router could be booting to rommon mode

1. There isn't a valid ios image loaded in flash memory
2. The configuration register is set to a number that ends with '0'

Change the configuration register setting to a number that ends in '2'. (i.e. 0x2402)

You do this with the command: confreg 0x2402 <hit enter key> (in rommon mode)

Reboot the router and it will first search for boot system commands in the startup config, if none found it will boot to the first valid ios image in flash memory.

If there isn't a valid ios image in flash memory, the router will continue to boot to rommon.

Posted on Apr 13, 2008

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Confreg command


Try just typing confreg from rommon mode and going through the dialog.

Or from the CLI in configuration mode:

Router(config)#line con 0
Router(config-line)#speed 115200

Dec 02, 2013 | Cisco 2801 Router

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Guide to Reset Password on a Cisco Router


How do I reset the password on my Cisco router?<br />I bought a Cisco 1700 router from an auction, but there is a password. How can I reset the router to original factory specifications? <br /><br />Sky sagem wireless router reset password? I just got this sky wireless router second hand and it has a password set on it. i tried to press the reset button at the back but it does not do any thing, it still comes as a password is set.<br /><br />How to reset password on dlink wireless router? I have a dlink wireless router model number DIR 825 . It works good but I am trying to access internet on my ipod and the password i have set is incorrect , this also happened when i tried to access internet on my laptop. When i first set up my ps3 i dont recall having to put a password in but this was when i first got the router. How do i reset the router password or find out what the password is AND if i reset the password or reset my router will my ps3 have to be reconnected or will it stay?<br /><br />How to reset password on a router? I recently acquired a linksys router (used) and need to know how to reset the password so that I can use it. Also, is there any way to modify a router to be useful as a cell/wifi blocker, or as a signal booster?<br />... <br /> ----From Yahoo Answers<br /><br /><br />To reset password on a Cisco/D-link/Linksys/Netgear router is a very common problem among people who want a secure network environment for surfing on the internet. If you are confused with the complicated procedure to reset or change the password on a router, or if you are trying to configure a Cisco router, but a password is blocking you from enable mode, don't worry, just do the steps as follows, password reset on a router is no longer upset to everyone.<br /><br />First, be informed that what you need:<br />.<a href="http://www.router-switch.com/Price-cisco-routers_c1">Cisco Router</a><br />.Computer<br />.Internet Connection<br />.Blue Serial Cable<br /><br />Guide for You to Reset Password on a Cisco Router:<br />1. Download a program called Putty from the first resource site below. PuTTy is a terminal emulator application which can act as a client for the SSH, Telnet, rlogin, and raw TCP computing protocols (PuTTy on Wikipedia).http://en.wikipedia.org/wiki/PuTTY<br /><br />2. Connect one end of the blue serial cable to the Cisco Router and the other to your computer. Open up the Putty program on your computer and select the radio button next to "serial" on the right-hand side of the start window. Click on the "Open" button in the bottom right-hand corner of the Putty start window to open the terminal.<br /><br />3. Power the Cisco Router on. As soon as the router begins loading in the green and black Putty terminal window, press the "Ctrl" and "Break" keys simultaneously until its going into rommon mode.<br /><br /><br />4. Once in rommon mode, you have to change the configuration register number to make the router boot from a blank configuration file. For the 2800 series Cisco Routers, the command "confreq 0x2142", changing the register number to 2142, worked. Search on cisco.com for information on your particular <a href="http://www.router-switch.com/Price-cisco-routers_c1">Cisco Router Series</a>.<br /><br />5. Type the restart command in rommon mode, which is "reset". This will boot the router up again. When it is finished, you should be able to type "en" to get into enable mode without a password.<br /><br />6. Once you change the running-config in RAM and save it to the startup-config in NVRAM, remember to change the configuration register number back to its default (usually 0x2102). This is important if you change anything on the running-config. <br /><br />Easy five steps help you finish resetting password on a Cisco router. Easy instruction, easy to follow. <br /><br />

on Jul 19, 2011 | Computers & Internet

1 Answer

Cisco IAD 2432-24FXS stuck in Rommon mode.


Is there a valid IOS image on the flash on the IAD? If it will only boot to ROMMON, also try issuing the "boot" command from the console prompt. If it then boots, you need to go into the configuration and set the boot election to auto-boot.

Sell Used Cisco Equipment

Oct 30, 2012 | Cisco Iad2432-24fxs 1yearwarranty...

1 Answer

1841 router in rommon mode cannot install flash


Basically you will need to use TFTP to get the IOS back on. HERE is an article from Cisco that explains how to do it. I have done this before and even though it takes a while to reload the IOS (because in my case I had to use a serial connection at 9600 baud) it does work.

Aug 25, 2012 | Cisco (1841) Router (cisco1841)

1 Answer

I m in rommon booting problem.my router version 1750.how can i exit from rommon?help me.


you need to change the config register back to 0x2102.
type "?" and find the command to change startup settings, go through the list (I'm working from memory here, sorry) and make sure it is NOT ignoring startup settings. There may be a way to edit the config register value directly, can't recall.

Aug 11, 2009 | Cisco 1750-4V Router

1 Answer

I have a problem with a cisco catalyst 2948G-L3. A have erase of mistake the bootflash. I have tried in some way to download a new IOS, i have the IOS bu i cannot download it in the flash because the...


Two ways to do that are xmodem (slow) or Tftp from rommon mode. (fast)
Place the IOS image in your tftp server directory and start tftp server.
Then enter the following in the switch exactly as below as all are case sensative:
rommon 1> IP_ADDRESS=xxx.xxx.xxx.xxx
rommon 2> IP_SUBNET_MASK=xxx.xxx.xxx.xxx
rommon 3> DEFAULT_GATEWAY=xxx.xxx.xxx.xxx
rommon 4> TFTP_SERVER=xxx.xxx.xxx.xxx
rommon 5> TFTP_FILE=full file name of ios as it reads
rommon 6> TFTP_CHECKSUM=0
this one is in lower case
rommon 7> tftpdnld

If you dont have a tftp server below is a link to a free one
http://www.solarwinds.net/Tools/Free_tools/TFTP_Server/

You will need the .bin IOS image for this and not the .tar file. The .tar file contains router cluster management files that you must issue the archive tar command to load all of the files. Can do that if needed after router is back online.

P.S.: If this information was helpful, please rate this solution.

Feb 24, 2009 | Cisco Catalyst 2948G-L3 Networking Switch

1 Answer

BUT IT IS NOY COMING THE PREVILAGE MODE(ROUER>)


normally if you forget the password with cisco, boot the router in rommon mode and change the registry to 0x2142 and reboot the router and change the password and change back the registry to 0x2102.

did you tried this all ...can u explain more about the same

Feb 09, 2009 | Cisco 2610XM Router

1 Answer

Bootup Router and then nothing


Hi,
Your router is in the wrong mode. You need to change this by changing the conf-register to 0x2102

at the rommon prompt type in

config-reg 0x2102

reboot

If there are any errors you can get the correct syntax by typing ? at the rommon prompt the line number will go up on every line.

The way to get into rommon mode is by pressing the break key from Hyperterminal as the router is rebooting. So make sure you don't do this by accident. If you do just reboot by power cycling.

Your Startup Config should be unchanged, but you need to be very careful what you do in rommon mode it is easy to blat stuff.

Any changes you make once you get into the command (enable) mode should be saved by
copy running-config startup-config

Any problems just let me know.

good feed back would be much appreciated.

Carrie

Dec 05, 2008 | Computers & Internet

1 Answer

Cisco router 857


hey you are saying that you want to configure the router,, but rommon mode is for breaking the password....do u forget the password of the router......can you explain why u need to log in through rommon mode

Nov 30, 2008 | Cisco 857W (882658019555) Router

2 Answers

Boot Loop


you may have to reload the OS of the router.
i dont suppose you can kick it into romon mode can you? (usually done by hitting the pause break button on boot.)

if you can you should be able to use Xmodem to reload the OS (as long as you have a copy of it located on your computer)

Mar 11, 2008 | Cisco 1603-R Router

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