[mrtg] Re: configure mrtg for a 1000M network router

Eric Brander Eric_Mailing_List at rednarb.com
Wed May 12 16:49:15 MEST 2004

George Lin wrote:

>Hello, everyone!
>I am assigned a task to configure mrtg for a 1000M network router. I have 
>some experiences before to configure mrtg to monitor a 100M network router, 
>so the basic configuration is not a problem. But a friend told me that mrtg 
>can not work smoothly with high speed network (for example, 1000M network) 
>without snmp V2 enabled and rrdtool enabled. And the interval mrtg script 
>runs should be 1 minute (as short as possible). I previously use 5 minute 
>interval in crontab to enable mrtg to monitor 100M router.
>My friends' words make me puzzled. To avoid additional problems when 
>configure mrtg for 1000M router. Anyone who has solid experiences can give 
>me help? What additional things should I care?
>Very truly,

32-bit counters on links that speed will often wrap within a 5-minute
period. SNMP v2 uses 64-bit counters and therefore won't wrap for quite
some time. So your options are:

Use the 64-bit counters and continue to poll every 5 minutes or

Use the 32-bit counters and poll more frequently to avoid counter wrap.

I recommend the first option as it is significantly easier to deal with
if your device supports it. The 2nd option requires an RRDTool
conversion which can be a large task for a novice.


Eric Brander

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