[mrtg] MRTG problems on a Foundry Switch?

[Eric Brander]

On 10/8/07, Scott Baker <bakers at web-ster.com> wrote:
> It seems like any time this port goes over 110 or so Mb/s the graph
> freaks out. It's like the counters are looping because it's so much
> bandwidth. The config is super simple:
>
> Target[foundry_1]: 1:xxxxxx at xxxxx:
> SetEnv[foundry_1]: MRTG_INT_IP="" MRTG_INT_DESCR="GigabitEthernet1"
> MaxBytes[foundry_1]: 125000000
> Title[foundry_1]: Traffic Analysis for 1 -- FESX424 Router
> PageTop[foundry_1]: <H1>Traffic Analysis for 1</H1>
> Options[foundry_1]: bits
>

You're seeing 32-bit counter wrap problem. Try SNMP v2 for 64-bit counters.
http://oss.oetiker.ch/mrtg/doc/mrtg-reference.en.html#ISNMPv2c