Using Security Device Manager
SDM software

SDM comes preinstalled on several Cisco router models manufactured in June 2003 or later that were purchased with the VPN bundle.

SDM is also available as a separate option on all supported routers with Cisco IOS software security features manufactured in June 2003 or later.

If a router does not have SDM installed, SDM can be downloaded from Cisco.com and installed on the router. The router must contain enough Flash memory to support both the existing Flash file structure and the SDM files.