Cisco ASA ROMON Issue.


Sh@@n's Blog

Boot Cisco ASA From TFTP (Upgrade from ROMMON)

KB ID 0000792 Dtd 22/03/13

Problem

If your firewall wont boot, either because the OS is corrupt, or you have a faulty flash memory. You can get up and running by booting the device from a TFTP server instead.

Solution

Before you start make sure you have your TFTP server running and the operating system in its root folder.

Install and Use a TFTP Server

1. Power on the firewall, during the boot phase press ESC to boot to ROMMOM mode.

2. The following commands will set the firewall’s IP address, default gateway, and the IPaddress of the device running the TFTP server. (Note: unless you are on a different network segment gateway and server address should be set the same).

Use ? for…

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