With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanTable
rpr Span Table
1.0.8802.17.1.1.1.1.3
The RPR interface Span table. All read-write attributes in this table are non-volatile, i.e. will be retained across system reset.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.