Value aren't displayed in graphs

[Hal]

Hi,
I monitoring traffic in our network. It works good when the traffic
is low (below 100 Mbps). When the values are low, they are correctly
displeyed in graphs.
But on some connections with high traffic
(greater than 100 Mbps approximately) collected values aren't displayed in graphs.

Look to the chart in attachments.

I use zabbix 1.1.1.
Vaules are collected through SNMPv2, they are stored as delta (speed per second.)

I think there can be some problem with mysql database. Some item in table
hasn't enough range, or something like that.

Can someone help?

Hal

[Calimero]

Did you check the zabbix server logfile to see whether you had timeouts while polling your device/router ?

[Hal]

Yes, i check it, there is nothing in zabbix server log file.