With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
diffServCountActNextFree
Services Differentiated Services Services Count Act Next Free
1.3.6.1.2.1.97.1.5.4
This object contains an unused value for diffServCountActId, or a zero to indicate that none exist.
Back to DIFFSERV-MIB MIB page.
IPHost Network monitor allows you to monitor diffServCountActNextFree on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.
