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.