Recover From Corrupt Or Missing File Image Or In Rommon Mode; Introduction - Cisco Catalyst 9400 System Management Configuration Manual

Recover from Corrupt or Missing File Image or
in ROMmon Mode
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Introduction

This section explains how to recover a Catalyst 9400 Series Supervisor from a missing or corrupted system
image, or an incorrect boot variable. The Supervisor module image can sometimes be corrupted during a
Trivial File Transfer Protocol (TFTP) download, or when manually deleted by the user. The switch provides
a number of ways to recover should any of these events occur on the Supervisor Engine.
When the Supervisor-equipped switch boots up or resets, there are these two possibilities:
1. The switch starts up normally and displays the Hostname> prompt or the default Switch> prompt.
2. The switch cannot find the image, the image is corrupt, no image is present in the bootflash device, or the
boot variable is set incorrectly and therefore winds up in ROM monitor (ROMmon) mode. It displays the
rommon> prompt. In ROMmon mode, the switch must be able to locate a valid system image from either
the bootflash device. These Supervisor Engine also provides an Ethernet Management port (10/100 Base
T), which is available only from ROMmon mode and can be configured to download a new valid image
through TFTP from a TFTP process. There is no option for Xmodem or Ymodem which allows you to
copy an image through the console port.
Normal Operation
When the switch operates normally, it is at the hostname> prompt or the default Switch> prompt. You can
issue the dir bootflash: command to view the contents of the Supervisor Flash device, as this example shows.
Issue the verify command to determine if the image has a valid checksum, as this example shows:
Switch#dir bootflash:
Directory of bootflash:/
61341696 bytes total (54824664 bytes free)
Introduction, on page 419
Recover Switch from a Corrupt or Missing Image in ROMmon Mode, on page 420
Recover Switch from a Continous Reboot, on page 421
Recover from a Corrupt or Missing Image, on page 424
Feature Information for Recovering a Switch, on page 431
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