@renatolopes Nope. Moreover, there were two times that the router stopped sending SNMP data until I rebooted it.

@Pete_G_67 unfortunately, no..

@Virgo The graphs above show the dynamics of incoming packets on the router port to which the switch port is connected, and outgoing packets on the switch port. These graphs must match. In practice,...

TL-R605 is edge router, it connect to managed switch D-Link. I use Zabbix (and LibreNMS too) to monitor utilization of network device. And I see strangerous things: when switch's port utilization...