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Annotation of 43BSDReno/contrib/isode-beta/doc/practical-osi1/a-session.tex, revision 1.1

1.1     ! root        1: %\begin{bwslide}
        !             2: %\part {SESSION SERVICES}\bf
        !             3: %\end{bwslide}
        !             4: 
        !             5: 
        !             6: \begin{bwslide}
        !             7: \part  {SESSION SERVICES}\bf
        !             8: 
        !             9: \vskip.5in
        !            10: \diagram[p]{figureA-6}
        !            11: \end{bwslide}
        !            12: 
        !            13: 
        !            14: \begin{bwslide}
        !            15: \ctitle {SESSION LAYER\\PURPOSE}
        !            16: 
        !            17: \begin{nrtc}
        !            18: \item  ADD STRUCTURE TO DATA CIRCUIT PROVIDED BY TRANSPORT
        !            19: \item  MORE ``APPLICATIONS ORIENTED'' STREAM TO USER
        !            20: \item  ADD CONTROL MECHANISMS TO DATA EXCHANGE
        !            21: \end{nrtc}
        !            22: \end{bwslide}
        !            23: 
        !            24: 
        !            25: \begin{bwslide}
        !            26: \ctitle {SESSION}
        !            27: 
        !            28: \vskip.5in
        !            29: \diagram[p]{figureA-13}
        !            30: \end{bwslide}
        !            31: 
        !            32: 
        !            33: %\begin{bwslide}
        !            34: %\ctitle {SESSION}
        !            35: %
        !            36: %\begin{nrtc}
        !            37: %\item 22 SERVICES
        !            38: %\item 50+ PRIMITIVES
        !            39: %\item COMPLEX STATE MACHINE RULES
        !            40: %\item QUITE COMPLEX COMPARED TO TRANSPORT SERVICE
        !            41: %%\item        PRIMITIVES PREFIXED WITH {\em S--\ldots}
        !            42: %\end{nrtc}
        !            43: %\end{bwslide}
        !            44: 
        !            45: 
        !            46: %\begin{bwslide}
        !            47: %\ctitle {USERS}
        !            48: %
        !            49: %\begin{nrtc}
        !            50: %\item {\em SS--user} TYPICALLY A PRESENTATION ENTITY
        !            51: %\item NOT ALWAYS THE CASE
        !            52: %      \begin{nrtc}
        !            53: %      \item   1984 MHS (X.400) USED RELIABLE TRANSFER TO DIRECTLY 
        !            54: %                                                      ACCESS SESSION
        !            55: %      \end{nrtc}
        !            56: %\item SESSION PROVIDER INTERACTS WITH A SINGLE {\em SS-user} ENTITY
        !            57: %\end{nrtc}
        !            58: %\end{bwslide}
        !            59: 
        !            60: 
        !            61: %\begin{bwslide}
        !            62: %\ctitle {\em SS-users}
        !            63: %
        !            64: %\begin{nrtc}
        !            65: %\item CONNECTION ESTABLISHMENT
        !            66: %      \begin{nrtc}
        !            67: %      \item   CALLING {\em SS-user}
        !            68: %      \item   CALLED {\em SS-user}
        !            69: %      \end{nrtc}
        !            70: %\item ACTION INITIATION
        !            71: %      \begin{nrtc}
        !            72: %      \item   REQUESTING {\em SS-user}
        !            73: %      \item   ACCEPTING {\em SS-user}
        !            74: %      \end{nrtc}
        !            75: %\item CONNECTIONS ARE SYMMETRIC
        !            76: %\end{nrtc}
        !            77: %\end{bwslide}
        !            78: 
        !            79: 
        !            80: %\begin{bwslide}
        !            81: %\ctitle {SESSION ADDRESSING}
        !            82: %
        !            83: %\begin{nrtc}
        !            84: %\item {\em SS-user} ADDRESSED AT SESSION SERVICE ACCESS POINT (SSAP) BY:
        !            85: %\item SSAP CONTENT:
        !            86: %      \begin{nrtc}
        !            87: %      \item   SESSION SELECTOR
        !            88: %      \item   TRANSPORT ADDRESS
        !            89: %      \end{nrtc}
        !            90: %%\item        SELECTOR IS A STRING OF OCTETS
        !            91: %\item TRANSPORT ADDRESS IDENTIFIES A GIVEN SESSION ENTITY
        !            92: %\item SESSION SELECTOR IDENTIFIES A SPECIFIC USER OF THAT ENTITY
        !            93: %\end{nrtc}
        !            94: %\end{bwslide}
        !            95: 
        !            96: 
        !            97: %\begin{bwslide}
        !            98: %\ctitle {U.S. GOSIP SESSION SELECTOR}
        !            99: %diagram
        !           100: %\end{bwslide}
        !           101: 
        !           102: 
        !           103: %\begin{bwslide}
        !           104: %\ctitle {SESSION ADDRESSING (cont.)}
        !           105: %
        !           106: %\begin{nrtc}
        !           107: %\item DE-MULTIPLEXING ON nSAPs
        !           108: %      \begin{nrtc}
        !           109: %      \item   KERNEL
        !           110: %      \item   USER
        !           111: %      \end{nrtc}
        !           112: %\item IMPLEMENTATION CONSIDERATION
        !           113: %\end{nrtc}
        !           114: %\end{bwslide}
        !           115: 
        !           116: 
        !           117: %\begin{bwslide}
        !           118: %\ctitle {SERIAL NUMBERS}
        !           119: %
        !           120: %\begin{nrtc}
        !           121: %\item {\em OPTIONALLY} MAINTAINED DURING SESSION CONNECTION
        !           122: %\item AVAILABILITY DEPENDS ON CONNECTION FUNCTIONALITY NEGOTIATIONS
        !           123: %\item USED TO COORDINATE AND REFERENCE TRANSACTIONS ON CONNECTION
        !           124: %\end{nrtc}
        !           125: %\end{bwslide}
        !           126: 
        !           127: 
        !           128: %\begin{bwslide}
        !           129: %\ctitle {CONNECTION IDENTIFIER}
        !           130: %
        !           131: %\begin{nrtc}
        !           132: %\item {\em SS-users} ASSIGN A UNIQUE IDENTIFIER TO A CONNECTION
        !           133: %%\item        {NOT A LOCAL MECHANISM SUCH AS A FILE DESCRIPTOR}
        !           134: %\item TYPICALLY
        !           135: %      \begin{nrtc}
        !           136: %      \item   EACH SYSTEM PROVIDES A HOST NAME
        !           137: %      \item   CURRENT UTC TIME IS PROVIDED IN A COMMON PORTION
        !           138: %      \end{nrtc}
        !           139: %\item USED TO RE--ESTABLISH BROKEN CONNECTIONS
        !           140: %\end{nrtc}
        !           141: %\end{bwslide}
        !           142: 
        !           143: 
        !           144: \begin{bwslide}
        !           145: \ctitle {SESSION PROVIDES}
        !           146: 
        !           147: \begin{nrtc}
        !           148: \item  DIALOGUE CONTROL (TOKENS)
        !           149: \item  SYNCHRONIZATION (CHECKPOINTING)
        !           150: \item  ACTIVITY MANAGEMENT
        !           151: \item  EXCEPTION REPORTING
        !           152: \item  {\em TRANSPORT FUNCTIONALITY}
        !           153: \end{nrtc}
        !           154: \end{bwslide}
        !           155: 
        !           156: 
        !           157: %\begin{bwslide}
        !           158: %\ctitle {TOKENS}
        !           159: %
        !           160: %\begin{nrtc}
        !           161: %\item MANY APPLICATION EXCHANGES ARE ACTUALLY HALF-DUPLEX
        !           162: %\item ``TOKENS'' KEEP TRACK OF WHO MAY SEND DATA
        !           163: %\item REQUESTS FOR A TOKEN CARRY A PRIORITY
        !           164: %\end{nrtc}
        !           165: %\end{bwslide}
        !           166: 
        !           167: 
        !           168: %\begin{bwslide}
        !           169: %\ctitle       {TOKENS}
        !           170: %
        !           171: %\begin{nrtc}
        !           172: %\item CONTROL EXCLUSIVE ACCESS TO PARTICULAR SERVICE
        !           173: %\item TRAFFIC SIGNAL OF SESSION COMMUNICATIONS
        !           174: %\item TOKENS ARE ONE OF:
        !           175: %      \begin{nrtc}
        !           176: %      \item   AVAILABLE \& OWNED
        !           177: %      \item   AVAILABLE \& NOT OWNED
        !           178: %      \item   UNAVAILABLE
        !           179: %      \end{nrtc}
        !           180: %\item EXCHANGED BETWEEN PEERS
        !           181: %\item MAINTAINED BY SS-PROVIDER
        !           182: %\end{nrtc}
        !           183: %\end{bwslide}
        !           184: 
        !           185: 
        !           186: %\begin{bwslide}
        !           187: %\ctitle {TOKENS (cont.)}
        !           188: %
        !           189: %\begin{nrtc}
        !           190: %\item 4 TYPES OF TOKENS
        !           191: %      \begin{nrtc}
        !           192: %      \item   DATA, SYNC MINOR, MAJOR/ACTIVITY, RELEASE
        !           193: %      \end{nrtc}
        !           194: %\item PERMITTED OPERATIONS
        !           195: %      \begin{nrtc}
        !           196: %      \item   GIVE TOKENS, PLEASE TOKENS, GIVE CONTROL
        !           197: %      \end{nrtc}
        !           198: %\end{nrtc}
        !           199: %\end{bwslide}
        !           200: 
        !           201: 
        !           202: %\begin{bwslide}
        !           203: %\ctitle {CHECKPOINTING}
        !           204: %
        !           205: %\begin{nrtc}
        !           206: %\item MANY APPLICATIONS EXCHANGE LARGE AMOUNTS OF DATA
        !           207: %\item CHECKPOINTS MAY BE INSERTED IN THE DATA STREAM, SO THAT
        !           208: %      \begin{nrtc}
        !           209: %      \item   IF THE TRANSPORT CONNECTION BREAKS AND IS RE-ESTABLISHED,
        !           210: %              DATA EXCHANGE MAY RESUME AT THE LAST CONFIRMED CHECKPOINT
        !           211: %      \end{nrtc}
        !           212: %\item SEMANTICS PROVIDED BY SS-USER
        !           213: %\item THREE KINDS OF SYNCHRONIZATION
        !           214: %      \begin{nrtc}
        !           215: %      \item   MINOR CHECKPOINTS (NEED NOT BE CONFIRMED)
        !           216: %      \item   MAJOR CHECKPOINTS
        !           217: %      \item   RESYNCHRONIZATION
        !           218: %      \end{nrtc}
        !           219: %\end{nrtc}
        !           220: %\end{bwslide}
        !           221: 
        !           222: 
        !           223: %\begin{note}
        !           224: %diagram sync example using ftam
        !           225: %\end{note}
        !           226: 
        !           227: 
        !           228: %\begin{bwslide}
        !           229: %\ctitle {RESYNC}
        !           230: %
        !           231: %\begin{nrtc}
        !           232: %\item INITIATED BY EITHER SS-USER
        !           233: %\item SETS SESSION TO DEFINED STATE
        !           234: %\item 3 OPTIONS
        !           235: %      \begin{nrtc}
        !           236: %      \item   ABANDON
        !           237: %      \item   RESTART
        !           238: %      \item   SET
        !           239: %      \end{nrtc}
        !           240: %\item PERMITTED OPERATIONS
        !           241: %      \begin{nrtc}
        !           242: %      \item   RESYNC ACK
        !           243: %      \end{nrtc}
        !           244: %\end{nrtc}
        !           245: %\end{bwslide}
        !           246: 
        !           247: 
        !           248: \begin{bwslide}
        !           249: \ctitle {RESYNCHRONIZATION EXAMPLE}
        !           250: 
        !           251: \vskip.5in
        !           252: \diagram[p]{figureA-33}
        !           253: \end{bwslide}
        !           254: 
        !           255: 
        !           256: %\begin{bwslide}
        !           257: %\ctitle {ACTIVITIES}
        !           258: %
        !           259: %\begin{nrtc}
        !           260: %\item MANY APPLICATION EXCHANGES CONSIST OF SEVERAL SMALLER EXCHANGES
        !           261: %\item LOGICALLY DIFFERENT TASKS
        !           262: %      \begin{nrtc}
        !           263: %      \item   ACTIVITIES CAN BE INTERRUPTED OR DISCARDED
        !           264: %      \item   DIALOGS WITHIN AN ACTIVITY DISTINGUISH PARTS OF  ``TASK''
        !           265: %      \end{nrtc}
        !           266: %\end{nrtc}
        !           267: %\end{bwslide}
        !           268: 
        !           269: 
        !           270: %\begin{bwslide}
        !           271: %\ctitle {ACTIVITIES (cont.)}
        !           272: %
        !           273: %\begin{nrtc}
        !           274: %\item TRANSFER OF LOGICALLY RELATED DATA
        !           275: %\item SEVERAL CONSECUTIVE ACTIVITIES ALLOWED
        !           276: %\item OPERATIONS
        !           277: %      \begin{nrtc}
        !           278: %      \item   START, END, INTERRUPT, RESUME, DISCARD
        !           279: %      \end{nrtc}
        !           280: %\item SEMANTICS PROVIDED BY SS-USER
        !           281: %\end{nrtc}
        !           282: %\end{bwslide}
        !           283: 
        !           284: 
        !           285: %\begin{note}
        !           286: %diagram activities example
        !           287: %\end{note}
        !           288: 
        !           289: 
        !           290: %\begin{bwslide}
        !           291: %\ctitle       {ACTIVITIES (cont.)}
        !           292: %
        !           293: %\begin{nrtc}
        !           294: %\item IMPLEMENTATION CONCERNS
        !           295: %      \begin{nrtc}
        !           296: %      \item   INTERRUPT/RESUME = SAVE/RESTORE STATE
        !           297: %      \item   BURDEN ON SS-USER
        !           298: %      \end{nrtc}
        !           299: %\end{nrtc}
        !           300: %\end{bwslide}
        !           301: 
        !           302: 
        !           303: %\begin{bwslide}
        !           304: %\ctitle {EXCEPTIONS}
        !           305: %
        !           306: %\begin{nrtc}
        !           307: %\item SOME APPLICATIONS MAY EXPERIENCE ABNORMAL EVENTS REQUIRING DRASTIC ACTION
        !           308: %\item AN EXCEPTION CAN BE REPORTED INSTEAD OF ABORTING THE CONNECTION
        !           309: %\item THE CONNECTION MUST BE BROUGHT TO A KNOWN STATE TO CLEAR AN EXCEPTION AND
        !           310: %      REQUIRES EXPLICIT ACTION ON THE OTHER SIDE
        !           311: %\end{nrtc}
        !           312: %\end{bwslide}
        !           313: 
        !           314: 
        !           315: %\begin{bwslide}
        !           316: %\ctitle {SESSION QUALITY OF SERVICE (QOS)}
        !           317: %
        !           318: %\begin{nrtc}
        !           319: %\item MOST PARAMETERS PASSED TO TRANSPORT SERVICE
        !           320: %\item OF CONCERN TO SESSION ENTITY:
        !           321: %      \begin{nrtc}
        !           322: %      \item   BATCH SEVERAL PRIMITIVES FOR SENDING
        !           323: %      \item   ALLOW FLOW--CONTROL BYPASS
        !           324: %      \end{nrtc}
        !           325: %\end{nrtc}
        !           326: %\end{bwslide}
        !           327: 
        !           328: 
        !           329: %\begin{bwslide}
        !           330: %\ctitle {SESSION QUALITY OF SERVICE (cont.)}
        !           331: %
        !           332: %\begin{nrtc}
        !           333: %\item RULES FOR NEGOTIATION
        !           334: %\item NOT REFLECTED IN PROTOCOL!
        !           335: %\end{nrtc}
        !           336: %\end{bwslide}
        !           337: 
        !           338: 
        !           339: %\begin{bwslide}
        !           340: %\ctitle {TRANSPORT FUNCTIONALITY}
        !           341: %\end{bwslide}
        !           342: 
        !           343: 
        !           344: %\begin{bwslide}
        !           345: %\ctitle {CONNECTION ESTABLISHMENT}
        !           346: %
        !           347: %\begin{nrtc}
        !           348: %\item NEGOTIATES
        !           349: %      \begin{nrtc}
        !           350: %      \item   FUNCTIONAL UNITS
        !           351: %      \item   INITIAL TOKEN POSITIONS
        !           352: %      \item   MAXIMUM TSDU SIZE
        !           353: %      \item   OPTIONS/VERSION/...
        !           354: %      \end{nrtc}
        !           355: %\item TWO WAY EXCHANGE
        !           356: %\item LITTLE ADDED FUNCTIONALITY OVER TRANSPORT, {\bf BUT A LOT MORE WORK!}
        !           357: %\end{nrtc}
        !           358: %\end{bwslide}
        !           359: 
        !           360: 
        !           361: %\begin{bwslide}
        !           362: %\ctitle {CONNECTION RELEASE}
        !           363: %\end{bwslide}
        !           364: 
        !           365: 
        !           366: %\begin{bwslide}
        !           367: %\ctitle {DATA TRANSFER\\SESSION USER DATA}
        !           368: %
        !           369: %\begin{nrtc}
        !           370: %\item SESSION SERVICE DATA UNIT (SSDU)
        !           371: %\item COMPOSED OF OCTETS (1 OR MORE)
        !           372: %\item PASS OPAQUELY THROUGH SESSION SERVICE
        !           373: %\item 3 TYPES OF SSDUs, WE WILL JUST CALL THEM SSDUs
        !           374: %\end{nrtc}
        !           375: %\end{bwslide}
        !           376: 
        !           377: 
        !           378: \begin{bwslide}
        !           379: \ctitle {SESSION USER DATA (cont.)}
        !           380: 
        !           381: \begin{nrtc}
        !           382: \item  ORIGINAL RESTRICTIONS ON SSDU SIZE FOR CONNECTION ESTABLISHMENT
        !           383:        \begin{nrtc}
        !           384:        \item   LIMIT OF 512 OCTETS
        !           385:        \item   SESSION VERSION 1
        !           386:        \end{nrtc}
        !           387: \item  TOO RESTRICTIVE FOR MANY OSI APPLICATIONS
        !           388:        \begin{nrtc}
        !           389:        \item   e.g., PASSING OSI DIRECTORY NAMES ON CONNECTIONS
        !           390:        \end{nrtc}
        !           391: \item  RECENT ADDENDA REMOVE THIS LIMIT
        !           392:        \begin{nrtc}
        !           393:        \item   PRACTICAL LIMIT OF 10K OCTETS USED
        !           394:        \item   SESSION VERSION 2
        !           395:        \end{nrtc}
        !           396: \item  VERSION 1 \& 2 DO \underline{NOT} INTERWORK
        !           397:        \begin{nrtc}
        !           398:        \item   NO NEGOTIATION POSSIBLE
        !           399:        \item   VERSION 2 MAY DOWNGRADE TO VERSION 1
        !           400:        \end{nrtc}
        !           401: \end{nrtc}
        !           402: \end{bwslide}
        !           403: 
        !           404: 
        !           405: 
        !           406: 
        !           407: %\begin{bwslide}
        !           408: %\ctitle{DATA UNITS}
        !           409: %
        !           410: %\begin{nrtc}
        !           411: %\item SSDU --- PASSED BETWEEN SS-USERS
        !           412: %\item SPDU --- PASSED BETWEEN SS-PROVIDERS
        !           413: %\end{nrtc}
        !           414: %\end{bwslide}
        !           415: 
        !           416: 
        !           417: %\begin{bwslide}
        !           418: %\ctitle {SPDU STRUCTURE}
        !           419: %
        !           420: %\begin{nrtc}
        !           421: %\item 4 COMPONENTS
        !           422: %\item USER DATA vs. USER INFORMATION
        !           423: %\item USER INFORMATION PRESENT ONLY ON NORMAL \& TYPED DATA SPDUs
        !           424: %\end{nrtc}
        !           425: %\end{bwslide}
        !           426: 
        !           427: 
        !           428: %\begin{note}
        !           429: %diagram spdu structure
        !           430: %\end{note}
        !           431: 
        !           432: 
        !           433: %\begin{bwslide}
        !           434: %\ctitle {SESSION FUNCTIONAL UNITS}
        !           435: %
        !           436: %\begin{tabular}{ll}
        !           437: %KERNEL                        &       CAPABILITY DATA \\
        !           438: %NEGOTIATED RELEASE    &       MINOR SYNC      \\
        !           439: %DUPLEX                        &       MAJOR SYNC      \\
        !           440: %HALF DUPLEX           &       RESYNC          \\
        !           441: %EXPEDITED DATA                &       ACTIVITY        \\
        !           442: %TYPED DATA            &       EXCEPTIONS      \\
        !           443: %\end{tabular}
        !           444: %\end{bwslide}
        !           445: 
        !           446: 
        !           447: %\begin{bwslide}
        !           448: %\ctitle       {FUNCTIONAL UNIT SUBSETS}
        !           449: %
        !           450: %\begin{nrtc}
        !           451: %\item FOR SOME TIME ``POPULAR'' FUNCTIONAL UNIT SUBSETS WERE DEFINED:
        !           452: %      \begin{nrtc}
        !           453: %      \item   BCS --- BASIC COMBINED SUBSET
        !           454: %      \item   BSS --- BASIC SYNCHRONIZATION SUBSET
        !           455: %      \item   BAS --- BASIC ACTIVITY SUBSET
        !           456: %      \end{nrtc}
        !           457: %\item NO LONGER USED, REFERENCE INDIVIDUAL FUNCTIONAL UNITS
        !           458: %\end{nrtc}
        !           459: %\end{bwslide}
        !           460: 
        !           461: 
        !           462: \begin{bwslide}
        !           463: \ctitle {IMPLEMENTATION CONSIDERATIONS}
        !           464: 
        !           465: \begin{nrtc}
        !           466: \item  SIMILAR TO OTHER UPPER LAYERS
        !           467: \item  WHERE
        !           468:        \begin{nrtc}
        !           469:        \item   USER LIBRARY
        !           470:        \item   DISTINCT PROCESS
        !           471:        \item   KERNEL RESIDENT
        !           472:        \end{nrtc}
        !           473: \end{nrtc}
        !           474: \end{bwslide}
        !           475: 
        !           476: 
        !           477: %\begin{bwslide}
        !           478: %\ctitle {SESSION VERSION 2}
        !           479: %
        !           480: %\begin{nrtc}
        !           481: %\item ``UNLIMITED'' USER DATA ON CONNECT
        !           482: %      \begin{nrtc}
        !           483: %      \item   STANDARDS LIMIT IS 64K OCTETS IN SINGLE SPDU
        !           484: %      \item   PRACTICAL LIMIT IS 10K OCTETS ON CONNECTION ESTABLISHMENT
        !           485: %      \end{nrtc}
        !           486: %\end{nrtc}
        !           487: %\end{bwslide}
        !           488: 
        !           489: 
        !           490: %\begin{bwslide}
        !           491: %\ctitle {SESSION}
        !           492: %
        !           493: %\center{\huge ``The sewer of OSI''}
        !           494: %\end{bwslide}
        !           495: 
        !           496: 
        !           497: %\begin{bwslide}
        !           498: %\ctitle {REFERENCES}
        !           499: %
        !           500: %\begin{description}
        !           501: %\item[ISO/IEC 8326:]  Basic Connection Oriented Session Service Definition
        !           502: %\item[ISO/IEC 8327:]  Basic Connection Oriented Session Protocol Specification
        !           503: %\end{description}
        !           504: %\end{bwslide}

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