Question about Cisco (1841) Router (cisco1841)

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Problem in IOS loading in 1841 router

Hi,
Any one help me regarding to solve ios loading in 1841 router.
when I'm restoring it through tftpdnld it shows an error as
get_macaddress(): search T_IDPROM_MACADDR(0xc3) : failed

pls help me..

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  • Anonymous Apr 14, 2009

    solomonA ...I NEED TO KNOW HOW TO INSTALL IOS IN CISCO 1841 FLASH BCZ IT SAY can not load flash......

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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)

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on Jul 07, 2011 | Computers & Internet

1 Answer

Rommon 2 ipaddress


With the set command.

Example:
rommon > set
PS1=rommon ! >
IP_ADDRESS=172.18.16.76
IP_SUBNET_MASK=255.255.255.192 DEFAULT_GATEWAY=172.18.16.65
TFTP_SERVER=172.18.16.2
TFTP_FILE=c2600-i-mz.bin

Alternatively you can XMODEM an image on there. However, that takes a long time, even if you increase your baud rate.

Also, on 2800 series routers you can put the image on a USB flash drive. However, the drive must be formatted as FAT and the partition size cannot be larger than 256 MB. This might work for an 1841.

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

1 Answer

Garbage in Cisco 1841


There are two things that can cause this:
  1. Incorrect serial settings. The default settings are 9600 baud, stop bits of 1, and parity 0. However, it is possible that these settings were changed. Likely, the baud setting may be higher as someone may have tried to XMODEM an IOS image onto the device and wanted faster speeds.
  2. Bad connection, cable
I hope this answers your question.

Jan 06, 2012 | Cisco (1841) Router (cisco1841)

1 Answer

1840 cisco router is not booting only cursor blinking not going ahead


HI,
It May be the problem with the IOS in the router Flash
  • Try hard reboot of the router If it is not soled proceed next.
  • while the router reboot press Pause button continuously, it will enter into the ROMMON mode.
  • using the Xmodem option upload the correct IOS, for refer Please refer the link
  • Please check the configuration Loading by confreg or config-register command and change into confreg 0x2142 to load from the Flash and reboot the router.

Jan 20, 2011 | Cisco (1841) Router (cisco1841)

1 Answer

Scramble on my cisco 1841


It sounds like the IOS is corrupt, and you will need to copy the IOS back to the router again. It could also be the flash memory that has gone faulty.

If you can get to any prompt on the router and you have a copy of the IOS, you can re-flash the IOS and see if that helps. If you can not telnet to the device you will need to connect via the console port, and ZModem or similar the image to the router.

May 02, 2010 | Cisco (1841) Router (cisco1841)

1 Answer

Cisco 1841 reads, Compact flash not found.


Perhap, your Compactflash is not be formated before you insert it into the slot of the Router.

Feb 11, 2010 | Cisco (1841) Router (cisco1841)

1 Answer

What is benefit of upload new ios?


THis would depend on the version of IOS you are moving to. Most of the time an IOS upgrade provides additional functionality and the ability to see more memory and that sort of thing

Feb 01, 2010 | Cisco (1841) Router (cisco1841)

1 Answer

Hi all. Now i'm lose IOS of cisco 2691. help me! and give me how to load IOS to Cisco 2691 by tftp. thanks alot


Recovering Cisco IOS Software imagesIf your Cisco router experiences difficulties and no longer contains avalid Cisco IOS software image in flash memory, you can download a newCisco IOS image using one of the following ROM monitor commands:
blank.gifxmodem—(AllCisco 2600 series routers) Use this command to copy a Cisco IOS imagefrom the console, if the computer attached to your console has aterminal emulator with Xmodem capability. See the "Copying an Image from the Console Using the xmodem Command" procedure.
note.gif Note blank.gifDownloadinga Cisco IOS image from a console is very slow. This procedure should beused only in an emergency and is not recommended for normal Cisco IOSimage upgrades.

For the fastest possible download from a console, set the console speed to 115200 bps by using the confreg ROM monitor command. See the "Configuration Register Commands" procedure.
blank.giftftpdnld—(ExceptCisco 2691) Use this command to copy a Cisco IOS image from a TFTPserver that is accessible through the FastEthernet 0/0, Ethernet 0/0,or Token Ring 0/0 port. See the "Copying an Image from a TFTP Server Using the tftpdnld Command" procedure.
note.gif Note blank.gifThetftpdnld command is not available on the Cisco 2691 router. Therecommended method for installing a Cisco IOS image on a Cisco 2691router is from a CompactFlash memory card loaded in the externalCompactFlash memory card slot. See the "Entering Boot Commands" procedure.

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

Mar 12, 2009 | Cisco 2691 Series IOS

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

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