RFC 1547 Point-to-Point Protocol Requirements December 1993 Table of Contents 1. Introduction ................................................3 1.1 Definitions of Terms ........................................4 2. Required Features ...........................................6 2.1 Simplicity ..................................................7 2.2 Transparency ................................................7 2.3 Packet Framing ..............................................7 2.4 Bandwidth Efficiency ........................................8 2.5 Protocol Processing Efficiency ..............................8 2.6 Protocol Multiplexing .......................................8 2.7 Multiple Physical and Data Link Layer Protocols..............8 2.8 Error Detection .............................................9 2.9 Standardized Maximum Packet Length (MTU) ....................9 2.10 Switched and Non-Switched Media .............................9 2.11 Symmetry ....................................................9 2.12 Connection Liveness .........................................10 2.13 Loopback Detection ..........................................10 2.14 Misconfiguration Detection ..................................11 2.15 Network Layer Address Negotiation ...........................11 2.16 Data Compression Negotiation ................................11 2.17 Extensibility and Option Negotiation ........................12 3. Features Not Required .......................................12 3.1 Error Correction ............................................12 3.2 Flow Control ................................................13 3.3 Sequencing ..................................................13 3.4 Backward Compatibility ......................................13 3.5 Multi-Point Links ...........................................13 3.6 Half-Duplex or Simplex Links ................................14 3.7 7-bit Asynchronous RS-232 Links .............................14 4. Prior Work On PPP Protocols .................................14 4.1 Internet Protocols ..........................................14 4.1.1 RFC 891 - DCN Local-Network Protocols, Appendix A............14 4.1.2 RFC 914 - Thinwire Protocols ................................14 4.1.3 RFC 916 - Reliable Asynchronous Transfer Protocol............15 4.1.4 RFC 935 - Reliable Link Layer Protocols .....................15 4.1.5 RFC 1009 - Requirements for Internet Gateways ...............15 4.1.6 RFC 1055 - Serial Line IP ...................................16 4.2 International Protocols .....................................16 4.2.1 ISO 3309 - HDLC Frame Structure .............................16 4.2.2 ISO 6256 - HDLC Balanced Class of Procedures.................16 4.2.3 CCITT X.25 and X.25 LAPB ....................................17 4.2.4 CCITT I.441 LAPD ............................................17 4.3 Other Protocols .............................................17 4.3.1 Cisco Systems point-to-point protocols ......................17 4.3.2 MIT PC/IP framing protocol ..................................18 4.3.3 Proteon p4200 point-to-point protocol .......................18 4.3.4 Ungermann Bass point-to-point protocol ......................18 Perkins