With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dot12InNormPriorityFrames
dot12 In Norm Priority Frames
1.3.6.1.3.63.1.2.1.3
This object is a count of normal priority frames that have been received on this interface. Includes both good and bad normal priority frames, as well as normal priority training frames and normal priority frames which were priority promoted.
Back to DOT12-IF-MIB MIB page.
IPHost Network monitor allows you to monitor dot12InNormPriorityFrames 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.