With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprErrorIntervalGroup
rpr Error Interval Group
1.0.8802.17.1.1.2.1.21
Collection of objects counting MAC span error intervals statistics.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprErrorIntervalGroup 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.