This read-write action object lets an administrator reset all the counters maintained for this DS3 port back to zero by writing the value "clear" (2); leaving it at "noaction" (1) has no effect. Admins use this after resolving an issue or before a baseline measurement period, so subsequent counter readings reflect only new activity rather than historical accumulation. For example, after replacing a faulty DS3 cable, an admin would set imatmPortCntrClrButton to clear so that error counters like imatmPortRcvInvCells start fresh for verifying the fix.