> I am rather new to RRD and have a question that (probably) has been asked > before (many times). > I occasionally get (unexplained) spikes in graphs when polling goes down > or if a router is rebooted. > I realize I must set thge min/max values. what are the vales ? > Is it assuming full duplex ? Is it time dependent ? > for example. > interfaces.ifTable.ifEntry.ifDescr.40 = "Serial2/0/0/28:0" > interfaces.ifTable.ifEntry.ifSpeed.40 = Gauge: 1536000 > should the max for 40 be 1536000 or (1536000 * 300) or (1536000 * 300 * 2)
I'm pretty sure you should use 192000! [Someone please correct me if I'm wrong...] Here's why: man "rrdcreate" sez "[f]or a traffic-COUNTER type DS this would be the max [...] data-rate expected from the device." The SNMP ifSpeed OID is max data-rate in bits/sec. Unfortunately, SNMP counters register bytes/sec. So you need to convert from bits/sec to bytes/sec (1/8 conversion factor) so you should use 192000 (1536000/8.) > what about other interface types ? Interface type doesn't matter: even with half duplex mediums, the wire may (in theory at least) be 100% utilized going just one way and thus the max value should be full wire speed. later steve - - - systems guy wiscnet.net -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-developers
