HP UX 11i v2 Networking Software manual Modes of Communication, Connection-mode Service

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Introduction to DLPI

The Data Link Layer

endpoint between a DLS user and the DLS provider. After the stream is created, the DLS user and DLS provider communicate via messages discussed later.

DLPI is intended to free data link users from speciﬁc knowledge of the characteristics of the data link provider. Speciﬁcally, the deﬁnition of DLPI hopes to achieve the goal of allowing a DLS user to be implemented independent of a speciﬁc communications medium. Any data link provider (supporting any communications medium) that conforms to the DLPI speciﬁcation may be substituted beneath the DLS user to provide the data link services. Support of a new DLS provider should not require any changes to the implementation of the DLS user.

Modes of Communication

Although DLPI supports three modes of communication, Hewlett-Packard supports connection and connectionless modes. The connection mode is circuit-oriented and enables data to be transferred over a pre-established connection in a sequenced manner. Data may be lost or corrupted in this service mode due to provider-initiated resynchronization or connection aborts.

The connectionless mode is message-oriented and supports data transfer in self-contained units with no logical relationship required between units. Because there is no acknowledgment of each data unit transmission, this service mode can be unreliable in the most general case. However, a speciﬁc DLS provider can provide assurance that messages will not be lost, duplicated, or reordered.

Raw mode interface is also supported. Raw mode allows the DLS user to send and receive packets with complete LLC and MAC header information.

Connection-mode Service

The connection-mode service is characterized by four phases of communication:

•Local Management

•Connection Establishment

•Data Transfer

•Connection Release

Chapter 1

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Contents Edition Dlpi Programmer’s GuideLegal Notices Page Page Contents Contents Contents Sample Programs Printing History Page Appendix a Sample Programs PrefacePage Introduction to Dlpi Introduction to Dlpi HP Dlpi Features Header Files Device File FormatData Link Layer Service InterfaceDlpi Modes of Communication Connection-mode ServiceData Link Layer Dlpi Addressing Connectionless-mode ServicePhysical Attachment Identiﬁcation HP PPA Format HP’s Dlsap Address Format 802.3, Ethernet, Token Ring, Fddi Data Link User IdentiﬁcationHP’s Dlsap Address Format for Fibre Channel Dlsap Promiscuous Mode Clariﬁcations Dlpi Services Dlhpppareq DlerrorackDlinforeq DlinfoackDlresetcon DlresetreqDlresetind DlresetresDlhprawdataind Local Management ServicesInformation Reporting Service DlhprawdatareqBind Service Attach ServiceReserved IEEESAPS/Ethertypes BindingSnap Message Flow Binding a Stream to a Dlsap Message Flow Enabling a Speciﬁc Multicast Address on a Connection Establishment Service Connection-mode Services12 Message Flow Successful Connection Establishment Connection Handoff13 Message Flow Token Retrieval 16 Message Flow Both Primitives are Destroyed by Provider 19 Message Flow Normal Data Transfer Data Transfer Service20 Message Flow DLS User-Invoked Connection Release Connection Release ServiceReset Service 23 Message Flow DLS User-Invoked Connection Reset Connectionless Data Transfer Connectionless-mode ServicesError Reporting Service Raw-mode ServicesRaw-mode Data Transfer XID and Test ServiceXID and Test Packet Handling 31 Message Flow XID ServiceAn Example 32 Message Flow Test Service33 Message Flow a Connection-Mode Example Dlpi Primitives Dlpi Primitives PPA Initialization/De-initialization Local Management PrimitivesDlhpppareq Dlhpppaack Dlhpppaack MTU DlinforeqDlinfoack Dlmetro DlcsmacdDltpb DltprDlother DlcharDlctca DlfddiDlacldls DlhprawdlsDlunknown DLSTYLE2 DLSTYLE1Dlattachreq DlaccessDlbadppa Dloutstate DldetachreqDlsyserr Dlbindreq Dlinitfailed DlbadaddrDlnotinit Dlbindack Dlunbindreq Dlsubsbindreq Dlhierarchicalbind DlpeerbindDltoomany DlsubsbindackDlsubsunbindreq Dlenabmultireq Dlnotsupported DldisabmultireqDlnotenab DlpromisconreqDlpromiscsap DlpromiscphysDlpromiscmulti Dlpromiscoffreq Dlokack Dlerrorack Dlphysaddrreq Dlfactphysaddr Dlcurrphysaddr Dlphysaddrreq DlphysaddrackDlsetphysaddrreq DlphysaddrackDlsetphysaddrreq Dlgetstatisticsreq DlgetstatisticsreqDlgetstatisticsack DlbusyDlgetstatisticsack DlhpmulticastlistreqDlhpmulticastlistack Dlhpmulticastlistack Dlunitdatareq Connectionless-mode Service PrimitivesDlbaddata Dlunitdataind Dluderrorind Message is valid in state Dlidle Dlhprawdatareq Raw Mode Service PrimitivesDlbadprim DlhprawdataindRaw Mode Service Primitives Connection-Oriented Dlpi Extensions Connection-mode Service PrimitivesDlhpinforeq Dlhpinforeq DlhpinfoackDlhpinfoack Connection-mode Service Primitives Connection-mode Service Primitives Dlhpsetacktoreq DlhpsetacktoreqDlhpsetptoreq DlhpsetptoreqDlhpsetbusytoreq DlhpsetrejtoreqDlhpsetrejtoreq Dlhpsetbusytoreq DlhpsetsendacktoreqDlhpsetsendacktoreq DlhpsetmaxretriesreqDlhpsetmaxretriesreq DLOUTCONPENDING, Dlinconpending DlhpsetackthreshreqDlhpsetlocalwinreq Dlhpsetremotewinreq Dlhpsetremotewinreq DlhpclearstatsreqDlhpclearstatsreq DlhpsetlocalbusyreqDlhpsetlocalbusyreq Dlhpclearlocalbusyreq DlhpclearlocalbusyreqDlconnectreq Dlbadqosparam DlconnectindDlbadqostype 112 Dlconnectres 114 Dlpending DlconnectconDlbadtoken Dlbadcorr116 Dltokenack DltokenreqDldatareq Dldisconnectreq Dldataind120 Dldisconnectind Dlresetreq Dlresetind Dlresetres Dlresetcon 126 Dltestreq Primitives to Handle XID and Test OperationsDltestauto DltestindChapter 129 Dltestres Dltestcon Dlxidreq Dlxidauto Dlxidind134 Dlpollfinal DlxidresDlxidcon Chapter 137 Dlpi States Udqos Pend Dludqos User Reset DluserresetDlresetcon Prov Reset Dlprovreset Dlresetres ResetresDLDISCON11 DLDISCON9Pend Pending DlinconpendingChapter 141 142 Sample Programs Longareasize Connection ModeAppendix a 145 146 Appendix a 147 148 Appendix a 149 150 Appendix a 151 152 Appendix a 153 154 Appendix a 155 Snap SAP Connectionless ModeAppendix a 157 158 Appendix a 159 160 Appendix a 161 162 Appendix a 163 164 Appendix a 165 166 Raw Mode 168 Appendix a 169 170 Appendix a 171 Raw Mode 172 Connection establishment Glossary174 Glossary Index

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