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How to correct this type of straight graph..., When my devices once reboot i begin to get the attached type of straight graphs.. Kindly help.

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mrtg create this type of straight graph when device reboots.. and when device reboots snmp starts automatically.. is there no way to make this correct?? or does not happen?

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A vague, short answer to a vague, short question: snmpd is probably not automatically starting during the server startup. Start snmpd at the server you are trying to graph.

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JP is right; mrtg's usual response to "i can't get any new data" is "i'll keep on graphing the last data i did get", leading to straight-line graphs. check that mrtg can in fact get up-to-date data from the device(s) in question, and if it can't, fix it. – MadHatter Oct 29 '10 at 11:01

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