Use the mqsichangetrace command to change the trace options that you have set.
mqsichangetrace IBNODE -u -e default -l debug
where:-u specifies user trace
-e specifies the integration server (in this case, the default integration server)
-l specifies the level of trace (in this case, changing it to debug)
F MQP1BRK,ct u=yes, e='default', l=debug