Saturday, February 28, 2015

Erase startup configuration in Cisco ASA

If you end up in a situation where you have to erase the startup configuration on ASA then you need to follow one of the below mentioned method.
Option 1: Use the "write erase" command:

ciscoasa# write erase
Erase configuration in flash memory? [confirm]
This will remove the startup configuration and reboot your firewall. 

Option 2: The other option is to use the command "configure factory default <mgmt_IP_&_subnet_mask>:

ciscoasa(config)# configure factory-default  
Based on the management IP address and mask, the DHCP address
pool size is reduced to 253 from the platform limit 256

WARNING: The boot system configuration will be cleared.
The first image found in disk0:/ will be used to boot the
system on the next reload.
Verify there is a valid image on disk0:/ or the system will
not boot.

Begin to apply factory-default configuration:
Clear all configuration
Executing command: interface management0/0
Executing command: nameif management
INFO: Security level for "management" set to 0 by default.
Executing command: ip address
Executing command: security-level 100
Executing command: no shutdown
Executing command: exit
Executing command: http server enable
Executing command: http management
Executing command: dhcpd address management
Executing command: dhcpd enable management
Executing command: logging asdm informational
Factory-default configuration is completed

This clears the configuration and enables the management interface with the IP address we specified. It also enables DHCP server and HTTP server so that we can connect through ASDM.

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