Hello, I am trying to monitor Cisco switches and routers. I am able to ping and check the uptime of the switch. 1) But for the port 1 link status, I am getting "SNMP CRITICAL - *down(2)*" error. 2) For port 1 bandwidth usage, the error is "check_mrtgtraf: Unable to open MRTG log file" I have installed MRTG, but I am not able to go any further. Also for the <a href="http://localhost/mrtg/10.111.100.102_43.html">http://localhost/mrtg/10.111.100.102_43.html</a> check, I am getting the following error 404 Not found The requested URL /mrtg/10.111.100.102_43.html was not found on this server. I have checked for assistance in <a href="http://www.mail-archive.com/nagios-users@lists.sourceforge.net/">http://www.mail-archive.com/nagios-users@lists.sourceforge.net/</a> but in vain. I am using Nagios Core version 3.2.0. Thanks in advance Regards Vikram