$ rrdtool create zul.rrd --start N DS:de0_in:COUNTER:600:U:U DS:de0_out:COUNTER:600:U:U RRA:AVERAGE:0.5:1:600 RRA:AVERAGE:0.5:6:700 RRA:AVERAGE:0.5:24:775 RRA:AVERAGE:0.5:288:797 RRA:MAX:0.5:1:600 RRA:MAX:0.5:6:700 RRA:MAX:0.5:24:775 RRA:MAX:0.5:288:797
-------------------------
$ rrdtool update zul.rrd N:`snmpget -Oqv zul public interfaces.ifTable.ifEntry.ifInOctets.4`:`snmpget -Oqv zul public interfaces.ifTable.ifEntry.ifOutOctets.4`
-------------------------
0-55/5 * * * * rrdtool update /home/andrew/rrdbs/zul.rrd N:`snmpget -Oqv zul public
interfaces.ifTable.ifEntry.ifInOctets.4`:`snmpget -Oqv zul public 
interfaces.ifTable.ifEntry.ifOutOctets.4`
-------------------------
$ rrdtool graph zul_de0-hourly.png -t "Hourly Bandwidth" --start -3600 \
DEF:inoctets=zul.rrd:de0_in:AVERAGE \
DEF:outoctets=zul.rrd:de0_out:AVERAGE \
AREA:inoctets#00FF00:"de0 In" \
LINE1:outoctets#0000FF:"de0 Out"
