listener trace

Running 19.16 on Solaris Sparc64

Seeing thie behaviour: I'm looking into Listener tracing, and it says to put the TRACE_LEVEL parameter to 0, 4, 10 or 16 to set the trace level.

Where 0 is the defult and also the lowest tracing level (no tracing)

and 16 is the highest

So, I look in SQLNET.ora, and there's no such parameter set, in any of my listeners.

I look at the log file (log.xml) and that file seems very big. Sizes between 100 and 300 M. The listeners have different uptime, lets say some run for days, the other for months, but not longer.

In the log file, it clearly says:  level='16'