We can limit to mac address on juniper devices and command is here:’

cli

configure

#Edit ethernet-switching-options secure-access-port

#Set interface ge-0/0/7 persisttent-learning

#Set interface ge-0/0/7 mac-limit2

Commit checkShow ethernet-switching table persistent-mac

Set interface ge-0/0/7 mac limit 2 action shutdown

(Shutdown to port after 2 mac address)