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CHAPTER
22-1
Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
22
Upgrading, Downgrading, and Installing System
Images
This chapter describes how to upgrade, downgrade, and install system images. It contains the following
sections:
• Upgrade Notes and Caveats, page 22-1
• Upgrades, Downgrades, and System Images, page 22-2
• Supported FTP and HTTP/HTTPS Servers, page 22-3
• Upgrading the Sensor, page 22-4
• Configuring Automatic Upgrades, page 22-8
• Downgrading the Sensor, page 22-11
• Recovering the Application Partition, page 22-12
• Installing System Images, page 22-13
Upgrade Notes and Caveats
Pay attention to the following upgrade notes and caveats when upgrading your sensor:
• Anomaly detection has been disabled by default in IPS 7.1(2)E4 and later. If you did not configure
the operation mode manually before the upgrade, it defaults to inactive after you upgrade to IPS
7.1(2)E4 or later. If you configured the operation mode to detect, learn, or inactive, the tuned value
is preserved after the upgrade.
• You must have a valid maintenance contract per sensor to download software upgrades from
Cisco.com.
• This service pack automatically reboots the sensor to apply the changes. During reboot, inline
network traffic is disrupted.
• You cannot uninstall IPS 7.1(x)E4. To revert to a previous version, you must reimage the sensor
using the appropriate system image file.
• 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).