With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
docsDevFilterLLCProtocol
DOCSIS Device Filter LLC Protocol
1.3.6.1.2.1.69.1.6.2.1.5
The layer-three protocol for which this filter applies. The protocol value format depends on docsDevFilterLLCProtocolType. Note that for SNAP frames, ethertype filtering is performed rather than Destination Service Access Point (DSAP) =0xAA.
Back to DOCS-CABLE-DEVICE-MIB MIB page.
IPHost Network monitor allows you to monitor docsDevFilterLLCProtocol on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.