The statistics about STP/RSTP topology changes can be
viewed. If the statistics increase, network flapping occurs.
Procedure
Run the display stptopology-change command to check statistics
about STP/RSTP topology changes.
Run the display stp [ interfaceinterface-type
interface-number | slotslot-id ] tc-bpdu statistics command to check statistics about sent and received TC/TCN packets.
Run the display stp [ interfaceinterface-type interface-number | slotslot-id ] [ brief ] command to check the spanning tree status and statistics.