How to count/determine downtime of Cisco 6500 switch?

[made_adi1]

Hello,

I work with cisco 6500 switches. now we need to evaluate the down time of all switces. now we using cacti to query system information to switches using SNMP, but some times cacti didnt get the data because of high cpu in switch so the switch stop di SNMP service. because of that, the data in Cacti not valid to determine our switch Downtime.

Is there any tools or ather way to monitor Cisco switch downtime??

Thanks a lot. 

[Leo Laohoo]

Easy.  What downstream switches were connected to this chassis that remained up.  

Log into those and look at the time when the uplink(s) went down and delta the time when the uplink(s) went up. 

[made_adi1]

Thanks Leo, thats true.  but I mean is there any mechanism to make it automatically tell us if the system is down? just like a reminding system. it can be send an email or some message.

[Leo Laohoo]

just like a reminding system. it can be send an email or some message.

EEM can be configured to send someone an email when some kind of "event" is triggered, such as an uplink goes DOWN/UP.  

However, the chassis can't send an email if it's down but can be configured to send out an email when the supervisor card boots up.  

[made_adi1]

Thanks Leo, I'll try to using EEM.