With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cieIfUtilEntry
cie If Util Entry
1.3.6.1.4.1.9.9.276.1.4.1.1
An entry containing utilization rates for the interface. Every interface for which the inbound and outbound traffic information is available has a corresponding entry in this table.
Back to CISCO-IF-EXTENSION-MIB MIB page.
IPHost Network monitor allows you to monitor cieIfUtilEntry 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.