Logical Link Control Protocol Page i
Contents
1 Overview ........................................................................................................ 4
1.1 Features and Scope ........................................................................................................ 4
1.2 Applicable Documents or References ........................................................................... 5
1.3 Administration ............................................................................................................... 6
1.4 Name and Logo Usage .................................................................................................. 6
1.5 Intellectual Property ...................................................................................................... 6
1.6 Special Word Usage ...................................................................................................... 6
1.7 Acronyms and Abbreviations ........................................................................................ 7
1.8 Glossary ......................................................................................................................... 8
2 Definitions .................................................................................................... 10
2.1 Bit Significance in Diagrams and Tables .................................................................... 10
2.2 LLC Protocol Version ................................................................................................. 10
3 Architecture ................................................................................................. 11
3.1 Components ................................................................................................................. 11
3.2 LLCP Data Transport Services .................................................................................... 12
3.2.1 Link Service Class ........................................................................................ 12
3.2.2 Connectionless Transport ............................................................................. 12
3.2.3 Connection-oriented Transport ..................................................................... 12
4 LLC Elements ............................................................................................... 14
4.1 LLC PDU Format ........................................................................................................ 14
4.2 Elements of the LLC PDU .......................................................................................... 14
4.2.1 Address Fields............................................................................................... 14
4.2.2 PDU Type ..................................................................................................... 15
4.2.3 Sequence Field .............................................................................................. 16
4.2.4 Information Field .......................................................................................... 16
4.3 PDU Descriptions ........................................................................................................ 16
4.3.1 Symmetry (SYMM) ...................................................................................... 16
4.3.2 Parameter Exchange (PAX) .......................................................................... 17
4.3.3 Aggregated Frame (AGF) ............................................................................. 17
4.3.4 Unnumbered Information (UI) ...................................................................... 18
4.3.5 Connect (CONNECT) ................................................................................... 19
4.3.6 Disconnect (DISC) ........................................................................................ 19
4.3.7 Connection Complete (CC) .......................................................................... 19
4.3.8 Disconnected Mode (DM) ............................................................................ 20
4.3.9 Frame Reject (FRMR) .................................................................................. 21
4.3.10 Information (I) .............................................................................................. 22
4.3.11 Receive Ready (RR) ..................................................................................... 23
4.3.12 Receive Not Ready (RNR) ........................................................................... 23
4.3.13 Service Name Lookup (SNL) ....................................................................... 24
4.4 LLC Parameter Format ................................................................................................ 25
4.5 Parameter Descriptions ................................................................................................ 25
4.5.1 Version Number, VERSION ........................................................................ 26
4.5.2 Maximum Information Unit Extension, MIUX ............................................ 26
4.5.3 Well-Known Service List, WKS .................................................................. 27
4.5.4 Link Timeout, LTO....................................................................................... 27
4.5.5 Receive Window Size, RW .......................................................................... 28
4.5.6 Service Name, SN ......................................................................................... 29
