With IPHost Network Monitor you can run simple snmp requests against a Dell device in your network.
portIsochronous
port Isochronous
1.3.6.1.4.1.795.2.7.5.1.1.6
Indicates whether or not the bus port supports isochronous transfers.
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IPHost Network monitor allows you to monitor portIsochronous on Dell device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Dell switches right now.