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SuperMicro321
Asked: 2011-02-06 01:01:03 +0800 CST

MRTG bandwidth not accurate

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I have MRTG with RRDTool configured to monitor the bandwidth on a switch, it is set to measure the traffic in bits. For the interface I need monitored it is showing this:

Description: GigabitEthernet2/0/25 ifType: ethernetCsmacd (6) ifName: Gi2/0/25 Max Speed: 1000.0 Mbits/s

Which is correct, it is a gigabit switch. However, on the graph it is showing 84.938Mbps out, which is not accurate, it is more like 849.38Mbps.

How do I get it to display the proper values?

rrdtool network-monitoring bandwidth mrtg

1 Answers

  1. Best Answer

    This is counter rollover. Make sure you are using SNMPv2(SNMP v2 use 64-bit counters).

    Add :::::2 to switch definition(Target[myswitch]: 2:public@switch1:::::2) and enable SNMP v2 on switch.

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