How to check lease line outage time from router

We have a lease line terminate on Cisco router 2811. Sometime lease line down and we have downtime clause in lease line work order I can deduct some amount from ISp if downtime is more than specified time. Can I get report from router that when internet is down and when start I have router access.

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Jan SpringerCommented:
I would configure syslog on the router and send the syslog data to an internal syslog server.

The interface state should be logged.

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I use and open source application Cacti to grab SNMP information from my routers/switches.  You can add modules such as THOLD (threshold monitoring) and actually get email alerts when something is down, and have graphs showing the historical information about the interface.  You can also get bandwidth utilization, CPU, etc.  There are some default templates for Cisco routers to make grabbing the information you want pretty easy.  Its a pretty nice application, if you don't mind open source and spending some time getting it set up.
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