You are not monitoring all of the routers in your environment
The device communicates with a local server and thus does not need to communicate with any routers (in which case, you should add SNMP support to the local server and add it to monitoring
When “Update” was clicked, we show the current ARP cache information on all of the devices. MAC addresses will expire out of ARP caches after 5 minutes (typically) of non-use. If the device is quiet (dormant and not communicating), then nobody will know about it’s information until it speaks up.
Modified on: Wed, 18 Jan, 2017 at 1:06 PM
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