Cacti graphing for 1Gbit network interfaces
mitch @ 5:58 pm on November 19, 2007
At my current place of employement, gigabit is deployed everywhere. I’d rather not get into the details as to why it is, but it goes without saying that its not really needed *everywhere*. None the less, I had cacti up and graphing for a couple months, before I thought I’d really like to see cacti graph a fully utilized gigabit port. Well, it turns out that the default configuration of the ucd/net snmp network interface ports on cacti will not graph a gigabit port. It will appear to work, but seems to wrap around at about 120Mbit. The reason is, cacti by default uses 32bit counters for this setting. It has a drop down under the network interfaces when creating graphs on a device, to use 64-bit counters. This is required for gigabit ports (if you want to get a true representation for the graph). I will see if I can grab some screen shots of this when I get back to work.
But overall, I love cacti and even after looking at similar tools, I much prefer cacti over anything else.
