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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
 
Chapter 50      X.509v3 Certificates for SSH Authentication
Additional References for 509v3 Certificates for SSH Authentication
Technical Assistance
Description Link
The Cisco Support and Documentation website 
provides online resources to download documentation, 
software, and tools. Use these resources to install and 
configure the software and to troubleshoot and resolve 
technical issues with Cisco products and technologies. 
Access to most tools on the Cisco Support and 
Documentation website requires a Cisco.com user ID 
and password. 
http://www.cisco.com/cisco/web/support/index.html