With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
brouterPortTable
brouter Port Table
1.3.6.1.4.1.9.5.1.6.14
entries is determined by the number of modules in the chassis and the number of ports on each module.
Back to CISCO-STACK-MIB MIB page.
IPHost Network monitor allows you to monitor brouterPortTable 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.