With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprSpanProtectionEntry
rpr Span Protection Entry
1.0.8802.17.1.1.1.1.4.1
One such entry for every span of an RPR interface.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprSpanProtectionEntry on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.