Cisco IPS 7.1 Installation Guide download pdf (Page 242)

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Cisco Intrusion Prevention System Appliance Hardware Installation Guide for IPS 7.1

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Appendix D Upgrading, Downgrading, and Installing System Images

Upgrades, Downgrades, and System Images

• You cannot use the downgrade command to revert to a previous major or minor version, for

example, from Cisco IPS 7.1 to 7.0. You can only use the downgrade command to downgrade from

the latest signature update or signature engine update. To revert to 7.0, you must reimage the sensor.

• You cannot downgrade the sensor using the recovery partition. To downgrade to an earlier version,

you must install the appropriate system image file (.img file).

• During a signature upgrade all signature configurations are retained, both the signature tunings as

well as the custom signatures. During a signature downgrade the current signature configuration is

replaced with the old signature configuration. So if the last signature set had custom signatures

and/or signature tunings, these are restored during the downgrade.

• All user configuration settings are lost when you install the system image. Before trying to recover

the sensor by installing the system image, try to recover by using the recover application-partition

command or by selecting the recovery partition during sensor bootup.

Upgrades, Downgrades, and System Images

Caution You cannot use the downgrade command to revert to a previous major or minor version, for example,

from Cisco IPS 7.1 to 7.0. You can only use the downgrade command to downgrade from the latest

signature update or signature engine update. To revert to 7.0, you must reimage the sensor.

Note You cannot downgrade the sensor using the recovery partition. To downgrade to an earlier version, you

must install the appropriate system image file (.img file).

Note During a signature upgrade all signature configurations are retained, both the signature tunings as well

as the custom signatures. During a signature downgrade the current signature configuration is replaced

with the old signature configuration. So if the last signature set had custom signatures and/or signature

tunings, these are restored during the downgrade.

You can upgrade and downgrade the software on the sensor. Upgrading applies a service pack, signature

update, signature engine update, minor version, major version, or recovery partition file. Downgrading

removes the last applied service pack or signature update from the sensor.

You can recover the application partition image on your sensor if it becomes unusable. Using the recover

command lets you retain your host settings while other settings revert to the factory defaults.

To install a new system image on the sensor, use ROMMON, the bootloader file, or the maintenance

partition depending on which platform you have. When you install a new system image on your sensor,

all accounts are removed and the default cisco account is reset to use the default password cisco. After

installing the system image, you must initialize the sensor again.

After you reimage and initialize your sensor, upgrade your sensor with the most recent service pack,

signature update, signature engine update, minor update, major update, and recovery partition files.

For More Information

• For the procedure for initializing the sensor, see Appendix B, “Initializing the Sensor.”

• For the procedure for locating software on Cisco.com, see Obtaining Cisco IPS Software, page C-1.

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Cisco IPS 7.1 Installation Guide Page 242