With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
diffServActionNextFree
Services Differentiated Services Services Action Next Free
1.3.6.1.2.1.97.1.5.1
This object contains an unused value for diffServActionId, or a zero to indicate that none exist.
Back to DIFFSERV-MIB MIB page.
IPHost Network monitor allows you to monitor diffServActionNextFree on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.