I am hoping someone might recognize this situation and have some insight. We recently added a PS1810-8G, running the latest PS.2.07 firmware, as a new switch. It is the only change in our network in the last four months.
Ever since we introduced it, an HP printer used for receiving FAXes three floors down gets knocked offline at 7AM and 7PM every single day. Disconnect the new HP switch, this behavior stops.
Reviewing the logs of our network edgerouter on a different floor, we see further evidence of this switch as the root cause by this example syslog entry matching the times (the address is the assigned IPv4 LAN address of our PS1810-8G):
2016-07-15 06:59:25 miniupnpd Unknown udp packet received from 192.168.2.102:1024
The HP C7280 printer will log a critical error on its local logfile at this same incident time:
575 69666 Firmware Error
So we have conclusively identified that the cause of the printers behavior is this periodic unknown UDP broadcast from the PS1810-8G. Both by process of elimination, and by correlating the time of the events with the syslog information. We also think it's very likely the HP printer firmware has a defect and should not be reacting this way, but the device is long out of service.
We have turned on debug level syslogging with the PS1810-8G, but there is nothing in the range of times when these events are happening to point to what is the switch is doing at those times. So we are just looking for technical information on what we could disable on the switch to stop these particular UDP broadcasts the switch is doing.
We tried turning off auto server discovery - No effect
We tried turning off LLDP - No effect
What other firmware settings trigger the switch to perform a regularly scheduled UDP broadcast that we coud experiment with to alleviate this situation?