Cisco Catalyst 9400 System Management Configuration Manual page 441

Recover from Corrupt or Missing File Image or in ROMmon Mode
Note The reason the switch reboots continuously is because the system image file name specified does not exist,
but there is a valid file in the bootflash. Also, the system image file name specified is case sensitive. If it is
not specified correctly, it causes a continuous reboot.
4. Since you have the required system image file present in the bootflash:, you can issue the boot
bootflash:<filename> command to boot the switch. The system is booted with that specified image. If
the switch fails to load due to the specified system image being corrupt, or the valid system file is not
present, see the Recover from a Corrupt or Missing Image section of this document.
5. Issue the enable command to enter into EXEC mode, as this example shows:
Switch>enable
Password:
Switch#
6. The system is back up. Issue the dir bootflash: command to note the file in the bootflash:.
7. Issue the show bootvar command to check the current boot variable.
Switch#show bootvar
BOOT variable = bootflash:packages.conf;
Configuration Register is 0x1822
MANUAL_BOOT variable = yes
BAUD variable = 115200
ENABLE_BREAK variable =
CONFIG_FILE variable =
8. Remove the existing incorrect boot variable and add the correct one. Issue the configure terminal
command in order to do this.
Switch#configure terminal
Enter configuration commands, one per line.
Switch(config)#no boot system flash bootflash:packages.conf
Switch(config)#boot system flash bootflash:cat9400packages.conf
Switch(config)#end
00:01:31: %SYS-5-CONFIG_I: Configured from console by console
9. Save the configuration from running to startup, by issuing the write memory command.
Switch#write memory
Building configuration...
Compressed configuration from 4359 bytes to 1730 bytes[OK]
Switch#
Check the boot variable again to make sure it is set properly so that the switch boots up the correct
10.
system file on the next reboot. Issue the show bootvar command in order to do this.
Switch#show bootvar
BOOT variable = bootflash:cat9400packages.conf
Configuration Register is 0x1822
MANUAL_BOOT variable = yes
BAUD variable = 115200
ENABLE_BREAK variable =
CONFIG_FILE variable =
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
Recover Switch from a Continous Reboot
End with CNTL/Z.
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