[mrtg] Gigabit Interfaces, SNMP v2, and MaxBytes

McDonald, Dan Dan.McDonald at austinenergy.com
Sat Nov 15 12:46:57 CET 2008

mrtg at ying.net wrote on Fri 14-Nov-08 19:01:
>When corroborating data on the actual interface, should the 5 minute
>input/output rates from a 'sh int' be fairly close to what is reported
>by MRTG?

not necessarily.  The cisco 5 minute values are exponentially decayed to give more weight to the last 30 seconds, while the mrtg values are straight-line averages that get interpolated based on the time stamp.

The only way to corroborate would be to look at packets in/out (also in show int .. counters), wait 5 minutes, look at the counters again, and then divide the difference by 300 to see if they matched.

Dan McDonald, CCIE # 2495, CISSP # 78281, CNX
Austin Energy

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