Cisco has some small business switches that can do some basic routing as well.
The SG300-52 does static and some layer 3 switching. 52 port version runs about $1k.
The SG500X does static and RIP routing.
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This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg).
If you're looking for how to monitor bandwidth using netflow or packet s…