Recover Switch from a Continous Reboot
The switch might end up in a continuous reboot sequence if the boot variable is not set to the correct system
image file and proper destination device.
You can recover the switch with the following steps:
1. You should already have a console connection to the Supervisor to see the previous output and perform
the recovery. On a standard Windows operating system platform, configure a HyperTerminal connection
directly to COM1 with these settings:
• 9600 bps
• Eight data bits
• No parity
• One stop bit
• Flow control = none
Use a rolled male RJ-45 cable to connect from COM1 on the PC to the console port on the Supervisor
module. Use a DB-9 connector on the PC.
2. The reboot continues until autoboot is prevented when you press Control-C and go into ROMmon mode.
This is shown in this example:
**********************************************************
* *
* Welcome to ROM Monitor for WS-X4014 System. *
* Copyright (c) 2002 by Cisco Systems, Inc. *
* All rights reserved. *
* *
**********************************************************
ROM Monitor Program Version 12.1(11br)EW
Board type 1, Board revision 5
Swamp FPGA revision 14, Dagobah FPGA revision 48
MAC Address : 00-01-96-d9-f6-fe
Ip Address : Not set.
Netmask : Not set.
Gateway : Not set.
TftpServer : Not set.
Main Memory : 256 Mbytes
***** The system will autoboot in 5 seconds *****
Type control-C to prevent autobooting.
!--- Press Control-C.
Autoboot cancelled......... please wait!!!
rommon 1 > [interrupt]
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
421
Recover from Corrupt or Missing File Image or in ROMmon Mode
Recover Switch from a Continous Reboot
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