With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rprIfPtqSize
rpr If Ptq Size
1.0.8802.17.1.1.1.1.1.1.10
The size in bytes of the Primary Transit Queue per ringlet supported by this RPR MAC.
Back to IEEE-802DOT17-RPR-MIB MIB page.
IPHost Network monitor allows you to monitor rprIfPtqSize 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.