With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cieIfIndex
cie If Index
1.3.6.1.4.1.9.9.276.1.6.1.1.2
This object represents the 'ifIndex' corresponding to the interface name mentioned in the 'cieIfName' object of this instance. If the 'ifName' mentioned in the 'cieIfName' object of this instance corresponds to multiple 'ifIndex' values, then the value of this object is the numerically smallest of those multiple 'ifIndex' values.
Back to CISCO-IF-EXTENSION-MIB MIB page.
IPHost Network monitor allows you to monitor cieIfIndex 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.