You can use the Cisco Network Analysis Modules for the monitoring the network. Cisco Network Analysis Modules ( NAMs ) are integrated and powerful traffic monitoring solutions for Cisco Catalyst 6500 Series Switches, Cisco 7600 Series Routers, and branch routers including the Cisco 2800 and 3800 Series Integrated Services Routers. Cisco NAMs combine a rich set of embedded data collection and analysis capabilities with a remotely accessible, Web-based management console, all of which reside on a single blade. The embedded Web-based Traffic Analyzer console offers quick access to configuration menus and presents easy-to-read performance reports on data, voice, and video traffic. The Cisco NAM not only provides the ability to analyze packets, but also the ability to analyze them from within the switch or router itself, giving you greater insight into how the network is being used and how users experience the services that your network offers.

For the more details follow the URL :

http://tools.cisco.com/support/downloads/pub/Redirect.x?mdfid=278393154