Maintaining System Memory Configuration Guide, Cisco IOS Release 15S
Last Updated: December 7, 2012
Zeroization erases all potentially sensitive information in the router memory. This includes the erasure of the main memory, cache memories, and other memories containing packet data, NVRAM, and Flash memory. The Zeroization button on the faceplate is used to invoke zeroization. The parameters for zeroization can be configured, but zeroization cannot be invoked through the command-line interface (CLI).
Zeroization is disabled by default.
Feature History for zeroisation
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn . You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Restrictions for Zeroization
Information About Zeroization
Scrubbing the Router Memory
Scrubbing is defined as performing several passes through the memory areas, overwriting the memory using a separate data pattern for each pass. The data patterns used for scrubbing consist of separate passes; each pass fills the memory with the following data patterns:
The data patterns ensure that
The following items in the router memory are scrubbed:
All the main memory is scrubbed except the memory area containing a small program loop that does the actual scrubbing.
The following items in the router memory cannot be scrubbed:
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