Hi Tarun,
In some cases, due to the corrupted image, misconfigured config-register value, missed bootvariable configuration the switch might fall into rommon.
Some useful Rommon commands:
=========================
Rommon>set===> the output of this command will show you the present bootvariable, configuration register value.
rommon 1
>set
PS1=rommon ! >
CONFIG_FILE=
?=0
BOOTLDR=bootflash:c6msfc-boot-mz.121-4.E1
SLOTCACHE=cards;
BOOT=sup-bootflash:c6sup11-jsv-mz.121-6.E,1;
Rommon>BOOT= ---> clears the boot variable in rommon
Rommon> BOOT =: --> sets the boot variable in rommon
Rommon> sync --> equals to wr mem in rommon.
Rommon>confreg 0x2102 --> sets the config register value to 2102 in rommon.
Rommon>reset --> reloads the device.
In some cases the boot variable may not be synced in Rommon. In such cases we need to manually set the bootvariable.
Rommon> dev ---> shows the list of memory devices present.
Rommon>dir bootflash:, dir disk0:, dir disk1: --> if the image is not present in the output , then it means there is no image in the memory device and xmodem process to be followed inorder to copy the image to the switch's bootflash or disk0 or disk 1
>dir bootflash:
File size Checksum File name
!--- Notice that there is no boot loader file
!--- present in the RP boot Flash.
Booting manually:
============
rommon 3 >boot slot0:c6sup11-jsv-mz.121-6.E
Xmodem proceedure:
================
rommon 1 >xmodem -y -s38400
!--- The -y option selects the Ymodem protocol.
!--- The -s38400 option sets the speed*.*
Do not start sending the image yet...
Invoke this application for disaster recovery.
Do you wish to continue? y/n [n]: y
Note, if the console port is attached to a modem, both the
console port and the modem must be operating at the same baud
rate. Use console speed 38400 bps for download [confirm]
!--- Press Enter.
Download will be performed at 38400. Make sure your terminal
emulator is set to this speed before sending file.
Ready to receive file ...
!--- As soon as you see the message "Ready to receive file",
!--- perform these steps on the HyperTerminal in order to send the file:
!--- 1) Click Disconnect.
!--- 2) Click Properties > Configure *.*
!--- 3) Choose 38400 from the drop-down menu in order to set the bps,
!--- and click OK in order to confirm.
!--- 4) Click Connect in order to reconnect at 38,400 bps.
!--- 5) Choose Transfer > Send File.
!--- This brings up a Send File window.
!--- 6) Click Browse in order to select the file.
!--- 7) Verify the protocol to be Ymodem.
!--- If it is something other than Ymodem, select Ymodem from
!--- the drop-down menu.
!--- 8) Click Send.
!--- This starts the transfer of the file.
Returning console speed to 9600.
Please reset your terminal emulator to this speed...
!--- When the transfer is complete, you see "Returning console speed to
!--- 9600" and then "Please reset your terminal emulator to this speed..."
!--- 1) Click Disconnect in HyperTerminal.
!--- 2) Click Properties > Configure.
!--- 3) Choose 9600 from the drop-down menu,
!--- and click OK in order to confirm.
!--- 4) Click Connect in order to reconnect at 9600 bps.
!--- On the basis of the amount of time necessary in order
!--- to complete these steps and reconnect at 9600 bps,
!--- you either see the bootup or simply the Router(boot)> prompt.
Useful link:
=============
http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_
note09186a008015bfa1.shtml#xmodem
Hope this helps.
Cheers
Somu
Rate helpful posts
