By default, pf_smtmon(1M) or nf_smtmon(1M) displays all of the SMT frames received by the local station. You can filter the output generated by pf_smtmon(1M) or nf_smtmon(1M) by specifying one or more frame classes on the command-line: nif, sif_config, sif_operat, ecf, rdf, esf, pmf_get.
For example:
To display the SIF configuration and SIF operation frames received by interface pf1, type:
# <basedir>/pf_smtmon -i pf1 sif_config sif_operat