Cisco SAFE, A Security Reference Architecture

Cisco has updated its security reference architecture guide, known as SAFE.

The Cisco SAFE consists of design blueprints based on proven security best practices that provide the design guidelines for building secure and reliable network infrastructures.

Here is the 344 pages SAFE reference guide:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/SAFE_RG/SAFE_rg.html