Cisco Catalyst 9400 System Management Configuration Manual page 443

Recover from Corrupt or Missing File Image or in ROMmon Mode
rommon 1 >dir bootflash:
File size Checksum File name
--------------------------------------------------
Total space = 61341696 bytes, Available = 61341696 bytes
Issue the set command to display the current environment variables.
rommon 3 >set
PS1=rommon ! >
RommonBuild=5
ConfigReg=0x2102
BOOT=bootflash:packages.conf
SkipDiags=0
BSI=0
RET_2_RTS=13:36:46 UTC Tue Aug 15 2000
RET_2_RUTC=966346606
BootStatus=Failure
BootedFileName=bootflash:packages.conf
RommonVer=12.1(11br)EW
4. Issue the unset BOOT command to clear the current invalid boot variable, which defines the file to
load.
rommon 6 >unset BOOT
5. Connect the management port on the Supervisor to the network to access a TFTP server. The Fast
Ethernet port (10/100 MGT) on the Supervisor Engine is inoperative in normal operation in current
software release. An Ethernet cable plugged into the 10/100 MGT is active only in ROMmon mode
As this example shows, if you plan to connect the 10/100 MGT port to the PC/Router directly, use a
straight cable. If you connect to another switch, use a crossover cable.
rommon 7 >
!--- Connect the appropriate cable to connect to the network.
Established physical link 100MB Full Duplex
Network layer connectivity may take a few seconds
The Management port auto-negotiates speed and duplex with the connected device. Currently, you can
not hardcode speed and duplex settings. Since this port is available only in ROMmon mode and for
TFTP only, it is not a major concern if the speed and duplex are mismatched due to any potential
auto-negotiating problem. The TFTP application has an internal packet loss mechanism to prevent any
corruption of the system image being downloaded.
6. Enter the set commands to configure an IP address for the 10/100 MGT port, as this example shows.
If the subnet mask is not specified, the IP address would take the default classful mask.
rommon 7> set IP_ADDRESS=192.168.247.10
rommon 8> set IP_SUBNET_MASK=255.255.255.0
7. Enter the set DEFAULT_GATEWAY command to configure the default gateway for the switch to
use to get to the TFTP server, as this example shows. The default gateway should be a routing device
in the same subnet as the IP address configured in Step 6.
rommon 8> set DEFAULT_GATEWAY=192.168.0.1
8. Enter the set command to verify the configurations which have been made.
switch: set
BAUD=9600
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
Recover from a Corrupt or Missing Image
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