The LCP State EngineRelation of Link Managementto the LCP State EngineLink initializationLink configurationLink terminationLCP FramesConfiguration messages (codes 1, 2, 3, and 4)Termination messages (codes 5 and 6)Code- and protocol-rejection messages (codes 7 and 8)Link integrity messages (codes 9, 10, and 11)Identification message (code 12)Other messagesLCP Configuration OptionsMaximum Receive Unit (code 1)Quality protocol (code 4)Magic number (code 5)Numbered Mode (code 11)Multilink MRRU, SSN, and ED (codes 17, 18, and 19)