Email Notification when router gets down

Hi Team,

Basically I am looking some script which will trigger an email once any of the router goes down for 5 times within 60 minutes.

In this i think we need to set a counter which will increment by 1 whenever it finds router down notification.

Problem is in case of many router down events , how can set set n number of counters for n number of router down events.

Thanks ,

Raghav