How I can find the 3725 router configuration guide ?

[firestone_83]

NEED A HELP~~~~~ 

I want to use GNS to do some test.

 I choose several 3725 routers and  want to use IS-IS and BGP .I search the relevant configuration guides on  http://www.cisco.com/cisco/web/support/index.html but could not find what I need.

who can give me some advise about how or where  i can get the Cisco 3700 Series router configuration guides or command reference???

[kka]

Configuration of features is OS-specific, hardly HW dependant. The 3725 runs "classic" IOS, configuration guides can be found under the corresponding IOS version: 12.4 12.4T