With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
docsDevFilterIpStatus
DOCSIS Device Filter Ip Status
1.3.6.1.2.1.69.1.6.4.1.2
Controls and reflects the status of rows in this table. Specifying only this object (with the appropriate index) on a CM is sufficient to create a filter row that matches all inbound packets on the ethernet interface and results in the packets being discarded. docsDevFilterIpIfIndex (at least) must be specified on a CMTS to create a row. Creation of the rows may be done via either create-and-wait or create-and-go, but the filter is not applied until this object is set to (or changes to) active. There is no restriction in changing any object in a row while this object is set to active.
Back to DOCS-CABLE-DEVICE-MIB MIB page.
IPHost Network monitor allows you to monitor docsDevFilterIpStatus on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.