How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer? – Rommon mode could use if Cisco Router IOS software is corrupted or missing. Rommon mode can be expressed as a disaster recovery area.
How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

Different methods can be used for Cisco Router IOS restores. However, if the Cisco Router IOS software is corrupted or missing, the Router is opened in Rommon mode. By entering TFTP server information in Rommon mode, new or robust IOS software can be recovered from a TFTP server connected via cross cable.

Before moving to Cisco Router IOS recovery steps using the Cisco Packet Tracer program, what is Rommon Mode in Cisco Router? Let’s talk briefly.

What is Rommon Mode in Cisco Router?

Rommon Mode is a Bootstrap program. Bootstrap starts the router hardware and then boots the Cisco IOS software. Rommon Mode is activated each time the Router is restarted or turned on and off.

If the Cisco Router is in Rommon Mode, it means that there is a problem with the Cisco IOS software. Therefore, at the command prompt of the Rommon Mode CLI, you should restore robust or new IOS software again.

On a Cisco Router running under normal conditions, users can not see Rommon Mode. When the Cisco IOS software is corrupted, it is automatically started in Router Mode. Or the user can start Manual.

The auxiliary software that performs all these operations is called Rommon Mode. It can be likened to the POST system that runs during the startup of a computer.

Rommon Mode is also called Rommon Monitor Mode, Boot Software, Boot Image, and Boot Helper.

How to Go to Rommon Mode in Cisco Router?

We can move on to the steps to go to Rommon Mode in Cisco Router. With Cisco Router Rommon Mode, we will restore the IOS software we have dumped from the TFTP Server again.

   Step 1

Open the Cisco Packet Tracer program and create a network topology as shown in the following image.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 2

Configure the TFTP Server TCP/IP settings.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 3

From the TFTP Server / Services window, go to the TFTP tab and delete all the files in it to avoid confusion.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 4

Open the Cisco Router CLI tab and configure the GigabitEthernet 0/0 interface.

[code] Router> en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#hostname R1
R1(config)#
R1(config)#interface gigabitethernet 0/0
R1(config-if)#ip address 192.168.10.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up
R1(config-if)#exit
R1(config)#
[/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 5

Before uploading the Cisco Router IOS software to the TFTP server, browse to the file on the Router with the show flash: command.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 6

To upload the Cisco Router IOS software to the TFTP server, perform the following commands. Make sure that you have exactly typed the name of the IOS software on the Router in the Source Filename field.

[code] R1# copy tftp: flash
Source filename []? c1900-universalk9-mz.SPA.151-4.M4.bin
Address or name of remote host []? 192.168.10.100
Destination filename [c1900-universalk9-mz.SPA.151-4.M4.bin]?

Writing c1900-universalk9-mz.SPA.151-4.M4.bin…
[/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 7

IOS software has been uploaded to the TFTP server.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 8

When we check the TFTP server in the Packet Tracer workspace, you can see that the Router IOS software has been successfully uploaded.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 9

After this step, we will follow the steps for using Cisco Router Rommon Mode. To delete the IOS software from the router, execute the following commands.

[code] R1# delete flash:
Delete filename []? c1900-universalk9-mz.SPA.151-4.M4.bin
Delete flash:/c1900-universalk9-mz.SPA.151-4.M4.bin? [confirm] [/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 10

After clearing the Cisco Router IOS software, enable it in Boot Helper Mode using the config-register 0x2100 command. Then reboot the Cisco Router with the Reload command.

[code] R1(config)# config-register 0x2100
[/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 11

As shown in the image below, the Cisco Router is turned on in Comm Mode.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 12

This step is crucial for Cisco Router IOS recovery. In Rommon mode, apply the following commands respectively.

[code] rommon 1 > IP_ADDRESS=192.168.10.1
rommon 2 > IP_SUBNET_MASK=255.255.255.0
rommon 3 > DEFAULT_GATEWAY=192.168.10.1
rommon 4 > TFTP_SERVER=192.168.10.100
rommon 5 > TFTP_FILE=c1900-universalk9-mz.SPA.151-4.M4.bin
[/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 13

Once you have configured the TFTP server to recover the IOS, use the tftpdnld command to upload the backup IOS software back to the router.

[code] rommon 6 > tftpdnld

IP_ADDRESS: 192.168.10.1
IP_SUBNET_MASK: 255.255.255.0
DEFAULT_GATEWAY: 192.168.10.1
TFTP_SERVER: 192.168.10.100
TFTP_FILE: c1900-universalk9-mz.SPA.151-4.M4.bin
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]:
[/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 14

Press Y (Yes) to continue.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 15

Cisco Router IOS recovery has completed successfully. Now let’s configure our Router to open from Flash.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 16

Use the confreg-register 0x2102 command to start the Router IOS software from Flash, and the reset command to restart the Router.

[code] rommon 2 > confreg 0x2102
rommon 3 > reset
[/code]

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 17

Cisco Router restarts…

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

   Step 18

Bootstrap successfully installed IOS software! You can check the files with the show flash: command on the router.

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer?

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer? ⇒ Video

You can watch how to recover Cisco Router IOS using Rommon Mode in Cisco Packet Tracer and you can also subscribe to our YouTube channel…

  Final Word

How to Recover Cisco Router IOS Using Rommon Mode in Cisco Packet Tracer? – In this article, we have seen that we will easily restore IOS problems that occur in Routers. In real scenarios, you may need a TFTP server like SolarWinds.

If this article is helpful, send me feedback by commenting! Thanks in advance, take care of yourself!

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