Cisco IPS-4255-K9 Installation Guide - Page 224
IPS-K9-x.y-z[a or p1]-E1.pkg, Signature Updates
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IPS Software Versioning Chapter 11 Obtaining Software Figure 11-1 illustrates what each part of the IPS software file represents for major and minor updates, service packs, and patch releases. Figure 11-1 IPS Software File Name for Major and Minor Updates, Service Packs, and Patch Releases IPS-K9-x.y-z[a or p1]-E1.pkg Product line/platform designator Strong crypto designator Major version level Minor version level Service pack level Repackage level Patch level Signature engine level File extension 191013 Signature Updates A signature update is a package file containing a set of rules designed to recognize malicious network activities. Signature updates are released independently from other software updates. Each time a major or minor update is released, you can install signature updates on the new version and the next oldest version for a period of at least six months. Signature updates are dependent on a required signature engine version. Because of this, a req designator lists the signature engine required to support a particular signature update. Figure 11-2 illustrates what each part of the IPS software file represents for signature updates. Figure 11-2 IPS Software File Name for Signature/Virus Updates, IPS-[sig]-[S]-req-E1.pkg Product line designator Package type Signature update Software version requirement designator Required engine version File extension 191014 11-4 Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0 OL-18504-01