Super Search is your friend, itsd2001, as is the Search form at the upper left of 'most every PerlMonks page.

In a nutshell, you'll either automate a series of Telnet sessions or a series of SNMP queries.   For the former, I'd strongly recommend using the Net::Telnet::Cisco CPAN module, and for the latter probably the Net::Snmp CPAN module.   The telnet approach might maybe be slightly easier, but SNMP efforts could well be less fragile and more secure.

More specifically, the code section on my homenode lists several Cisco-ey scripts, a few of which might give you a good head start.

• (code) Poor Man's TACACS - automate CatOS and IOS password resets with Net::Telnet::Cisco and Net::SNMP
• (code) Net::SNMP, Bandwidth, GnuPlot, PNG, PostScript, Excel
• (code) Resolve list of DNS names
• (code) Net::SNMP, table-ish interface stats
• (code) Cisco errdisable (no password timeout if Win32)
• (code) Cisco sho ver
• (code) Cisco Neighbors
• (code) mind your snmPs & Qs
• (code) MAC n' IP cheese

Good luck, welcome to the Monastery, and feel free to ask more questions as your project progresses.