LCP
LCP is used to establish, configure and test the data-link connection for a PPP link. This protocol is used to automatically agree upon the encapsulation format options, handle varying limits on sizes of packets, detect a looped-back link and other common misconfiguration errors, and terminate the link. This protocol is used to establish, configure and test the data-link connection for a PPP link.
Available to all SRX running 12.3X48+
Available to all MX running 20.2R1+
Available to all vSRX running 20.3R1+