With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanIfIndex
rpr Span If Index
1.0.8802.17.1.1.1.1.3.1.1
The ifIndex of this RPR interface.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanIfIndex 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.