[mrtg] graphing behavior need help

Taylor Lewick Taylor.Lewick at us.fortis.com
Thu May 15 17:37:27 MEST 2003

I posted an earlier message on this subject, but I wanted to explain it in more detail.

I have been using mrtg for some time now and it works great.
recently, we notcied that our media servers (for veritas backups) were all reaching the saturation point on thier network interfaces.  All of the cards are 100 Mbit full duplex.  So we decided to upgrade these to Gigabit interfaces.  We picked one box to test on and the change was successful.  So I wanted to see if MRTG would detect the higher utilization.  I pumped data through the interface and saw that MRTG only graphed it at around 115 Mbits max.  Some people on the list told me I needed to tell it to use snmp v2 in order to get the correct values.

I made this change yesterday, but saw the interface hit 9 Gigabits a second, at a time when I don't think much went over this link.  
Also, now, only on the switch that has the interface for the server we upgraded, I am noticing several of the graphs are exactly the same.  I know this isn't possible because I know what travels over the other servers' interfaces.

Has anyone seen anything like this.  The only confgiuration change I made in the mrtg config file was to change the AbsMax value and told it to poll with snmp v2 but only for that single interface, which is one of dozens on that switch.

Any help or insight is appreciated.

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