This cyclic counter tallies non-mac frames whose routing information field was too long for the UDP/IP package to process (for learning purposes); meaningful for token ring interfaces only. Admins watch it as a sign of an overly-complex bridged topology upstream, where a frame has traversed more bridge hops than this device can track. For example, a nonzero count here would prompt an admin to investigate the source-route bridging topology for excessive hop counts.