With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cieIfUtilTable
cie If Util Table
1.3.6.1.4.1.9.9.276.1.4.1
This table contains the interface utilization rates for inbound and outbound traffic on an interface.
Back to CISCO-IF-EXTENSION-MIB MIB page.
IPHost Network monitor allows you to monitor cieIfUtilTable 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.