Cisco ROMmon Recovery Procedure

Cisco ROMmon Recovery Procedure:

Today i will discuss cisco rommon recovery procedure step by step. so lets go………..

1. Start the TFTP server (make sure the file path is correct and that you allow both transfer and receive)
2. Connect to the router via Ethernet cable (an Ethernet cable is preferred due to the large size of the file and the maximum speed that data can travel over the console cable) [boxads]

N.B: Before the IOS is loaded it is important to make sure that your router has enough memory to support the IOS. The router will allow an IOS to be loaded even if there is not enough memory, in this case a smaller IOS will have to be loaded.

3. At the rommon prompt enter the following commands (commands are case sensitive, and the use of the directional arrows and tab auto complete function is not allowed):

IP_ADDRESS=IP address of the Ethernet port
IP_SUBNET_MASK=subnet mask of the Ethernet port
DEFAULT_GATEWAY=the default gateway
TFTP_SERVER=the IP of the TFTP server (your local computer)
TFTP_FILE=the file name of the IOS file
tftpdnld

4. The router will then issue a warning message:
Invoke this command for disaster recovery only.
WARNING: all existing data in all partitions on flash will be lost!
Do you wish to continue? y/n: [n]: y

5. Enter y, and the IOS will load
6. Once loaded you must boot up the new IOS by issuing the boot command.

Cisco ROMmon Recovery Example:

[adsense]

rommon 1 > IP_ADDRESS=1.1.1.1
rommon 2 > IP_SUBNET_MASK=255.255.255.0
rommon 3 > DEFAULT_GATEWAY=1.1.1.1
rommon 4 > TFTP_SERVER=1.1.1.2
rommon 5 > TFTP_FILE=asr901-universalk9-mz.153-3.S.bin
rommon 6 > tftpdnld

IP_ADDRESS=1.1.1.1
IP_SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=1.1.1.1
TFTP_SERVER=1.1.1.2
TFTP_FILE=asr901-universalk9-mz.153-3.S.bin
tftpdnld

Performing tftpdnld over Ethernet.
Interface link state up.
Receiving asr901-universalk9-mz.153-3.S.bin from 1.1.1.2 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
File reception completed.
program load complete, entry point: 0x2000000, size: 0x24ac390
Self decompressing the image : ################################################################################################################################################################################################## [OK]
*** No sreloc section
Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software – Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco IOS Software, 901 Software (ASR901-UNIVERSALK9-M), Version 15.3(1)S1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Thu 27-Feb-14 18:58 by prod_rel_team

N.B: Start the TFTP server before working ROMmon Recovery.

Shahed

Hi! I am Shahed Israr. I try to help GPON Technology users with their queries and provide them with relevant and accurate information to the best of my ability. My main goal is to assist and enhance GPON Technology user and help people find the answers they're looking for quickly and easily.

Follow Me: