With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
crepIfIndex
crep If Index
1.3.6.1.4.1.9.9.601.1.2.1.1.1
This object identifies the ifIndex-value assigned to the interface.
Back to CISCO-RESILIENT-ETHERNET-PROTOCOL-MIB-----B MIB page.
IPHost Network monitor allows you to monitor crepIfIndex 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.