SNMP Service Uknown

[Dei Bertine]

Hi all,

I got the first part set-up on monitoring my network equipment.
Ran the verify and everything was OK.
However when I go to the Nagios page, I see these logs in my network equipment:
"SNMP problem - No data received from host "

This is the notification email I got:
Notification Type: PROBLEM
Service: PING
Host: CISCO
Address: 172.168.2.1
State: UNKNOWN
Date/Time: Thu Apr 23 21:29:00 EDT 2009
Additional Info:
SNMP problem - No data received from host

This is a sample of my cfg file:
define service{
        use                             local-service           ; Inherit values from a template
        host_name                       cisco-router             ; The name of the host the service is associated with
        service_description             PING             ; The service description
        check_command                   check_snmp!-C public -o sysUpTime.0
        normal_check_interval           5                       ; Check the service every 5 minutes under normal conditions
        retry_check_interval            1                       ; Re-check the service every minute until its final/hard state is determined
        }

Not sure on this but is there anything in the router/switch that need to enable? 
I'm sure it supports snmp. 
Please advise.
Thanks! 


      
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