Cisco IPS-4255-K9 - Intrusion Protection Sys 4255 Installation Manual page 225

Chapter 11 Obtaining Software
Signature Engine Update
A signature engine update is an xecutable file containing binary code to support new signature updates.
Signature engine files require a specific service pack, which is also identified by the req designator.
Figure 11-3
Figure 11-3
Product line designator
Package type
Signature engine level
Software version requirement designator
Required software version
File extension
Recovery and System Image Files
Recovery and system image files contain separate versions for the installer and the underlying
application. The installer version contains a major and minor version field. The major version is
incremented by one of any major changes to the image installer, for example, switching from .tar to rpm
or changing kernels. The minor version can be incremented by any one of the following:
• Minor change to the installer, for example, a user prompt added.
• Repackages require the installer minor version to be incremented by one if the image file must be
repackaged to address a defect or problem with the installer.
Figure 11-4
files.
Figure 11-4
Product line/platform designator
Strong crypto designator
Package type
Installer major version
Installer minor version
Application version designator
Application version
File extension
OL-18504-01
illustrates what each part of the IPS software file represents for signature engine updates.
IPS Software File Name for Signature Engine Updates
IPS-[engine]-[E]-req-x.y-z.pkg
illustrates what each part of the IPS software file represents for recovery and system image
IPS Software File Name for Recovery and System Image Files
IPS-K9-[mfq,sys,r,]-x.y-a-
Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0
IPS Software Versioning
.img or pkg
*
11-5