NetXMS Support Forum

Hi Victor,

I have a problem monitoring a DLINK DES-1228P power over ethernet switch. When I enable the SNMP management from NetXMS, after a while (it can be one hour or several hours) some of the ports go down (disconnected) and the physical devices attached to those ports are no more reachable; I have to go to the management interface of the switch and force the ports to go on. This is repeatable, if I put the node in "unmanaged" state everything works fine (all the devices are properly reachable), after switching to "managed" state the same story restart again.
Do you have encountered a similar problem? What can be the reason? Is there any way to instruct NetXMS to reduce polling frequency or wathever else that could help?
Switch is updated with latest firmware and unfortunately is no more supported by DLINK.

Bye,
Marco

Hi!

Looks like a bug in firmware. I've seen somewhat similar problem with some HP ProCurve switches - after lot of SNMP requests they stop responding to SNMP for a few minutes. What you can do is to disable all poll types except status poll for that switch (in properties on "Polling" page). If this will not help, then you have no other option as to disable status poll as well (or you can disable SNMP and just use ping to see if device is still online). Unfortunately there are no option to set polling interval individually for device (but looks like it has to be implemented).

Best regards,
Victor