Juniper JunOS fwdd commands

Those commands can show you the status of fwdd:

request pfe execute target fwdd command "show services mum"
request pfe execute target fwdd command "show usp fto stats"
request pfe execute target fwdd command "show route summary"
request pfe execute target fwdd command "show eth tree"
request pfe execute target fwdd command "show heap 0"