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3.1 ATM

ATM(Asynchronous Transfer Mode)«Y¥Ñ°ê»Ú¼Ð·Ç³æ¦ì©Ò¨î©w¡A¬O¤@ºØ¾A©ó°Ï°ì¤Î¼s°ìºô¸ôªº¶Ç¿é§Þ³N¡A¥H53 Byteªø«×ªº²Ó­M(Cell)¬°¶Ç¿é³æ¦ì¡A¥Î¨Ó¤ä´©¦hºØ«¬ºA¬y¶qªº°ª³t¹w±µ¦¡¦h¤u¤Î¥æ´«§Þ³N¡F¥¦±Ä¥Î³s±µ¾É¦V¦¡(connection-oriented)¨ó©w¡A³Ì¥D­n¬O°µ¬°¤@ºØ¦h¥\¯à¹w±µ¦¡ªº¶Ç¿é¼Ò¦¡¡C

±qB-ISDN¨ó©w°Ñ¦Ò¼Ò«¬ªº¨¤«×¨Ó¬ÝATM[1]¡A¨ä¥D­n¼h¦¸¥]¬A(1)¹êÅé¼h¡F(2)²£¥Í²Ó³¡µ²ºc¤Î©w¸qµêÀÀºô¸ô»PµêÀÀ³q¹DªºATM¼h¡F¥H¤Î(3)´£¨Ñ°ª¶¥ªA°È¦pSMDS¡B°T®Ø¶Ç°e(frame relay)¡B¹q¸ô¼ÒÀÀ(circuit simulation)µ¥ªºATM¾AÀ³¼h¡C³z¹L³o¤T¼hªº¬Û¤¬¹B§@¡AATM¥i´£¨Ñ³n¡BµwÅ骺¦h¤u¥æ´«¤Î¤¬¬Û³s±µ¥\¯àªº¥­»O¡A¥H¤Î¸gÀÙ¡B¾ã¦Xºô¸ô¦s¨úªºªk«h¡A¨Ã´£¨Ñ¦hºØªA°È«~½è(QoS¡GQuality of Service)ªºµ¥¯Å¡A¥H²Å¦X¤£¦PÀ³¥Î¨t²Îªººô¸ô©µ¿ð»Ý¨Dªº¥\¯à¡CATMªº¥Ø¼Ð¬O±N¾ã­Óºô¸ô³z¹LATM¤ÎATM¤WAAL¦U¼hªºÀ³¥Î¥æ´«¦h¤u¤èªk¨Ó¤ä´©»y­µ¡B¼v¹³¡Bµø°T¡B¹q¸ô¼ÒÀÀ¡B«Ê¥]¼Æ¾Ú¦pSMDS¡BIP¡B°T®Ø¶Ç°eµ¥ªA°È¡C

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ATM³Ì¤jªºÀuÂI«K¬O¦b©ó¨ä¥i¥Ñ¦P¤@­Ó¹q¸£¡B¦h¤u¾¹¡B¸ô¥Ñ¾¹¡B¥æ´«¾¹¡Bºô¸ô´N¯à³q¥Î©ó¤£¦P©Ê¯à¡B«~½è©M°Ó·~»Ý¨DªºÀ³¥Î¨t²Î¡C»Ý­nATMªº¼u©Ê©M®Ä¯àªºÀ³¥Î¨t²Î¥]¬A¡G(1)¤j²³ªA°È°Ó·~À³¥Î¨t²Î¦p°Ï°ì¡B¼s°ìºô¸ô¤§¶¡ªº¬Û¤¬³sµ²¡B¤j«¬Àɮתº¶Ç¿é¤Î§Y®É¦s¨úÀɮסB®à¤W«¬¹q¸£ªº¦h´CÅéÀ³¥Î¦p¹q¤l¶l¥ó¡B¿ý­µ¤Î´CÅé¼½©ñ»P§éÅ|¦¡¥D·F(Collapsed Backbone)ªº®Õ¶éºô¸ôµ¥ªº±±¨î¨t²Î¡C(2)®ø¶O«¬ªA°ÈÀ³¥Î¨t²Î¦p¹q¤l¶l¥ó¤Î¦h­«°T®§¨t²Î¡BÀH¿ïµø°TªA°È(Video On Demand¡AVOD)¤Î¤¬°Ê¦¡¹q¤lÀ³¥Î¨t²Î¤Î¹CÀ¸µ¥µ¥¡C(3)¤½²³ªA°ÈÀ³¥Î¨t²Î¦p»·¶Z±Ð¾Ç¡Bµø°T·|ijµ¥µ¥¡C¹Ï3.1¬°ATMºô¸ô¬[ºc¹Ï¡C

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3.2 MPOA

MPOA(Multi-Protocol Over ATM)¬OATM½×¾Âªº²Ä¤@­Ó·~¬É¼Ð·Ç[2]¡A¥Î¨Ó¤¹³\¸ô¥Ñºô¸ô§Q¥ÎATMºô¸ôªº¦n³B(¦p¸û§Cªº©µ¿ð¡A®Ä¯à»PÂX¥R©Êµ¥)¡C¥¦ÂX®i°Ï°ìºô¸ô¼ÒÀÀ(LAN Emulation)¡A¥j¨åIP/ATM©Mºô»Úºô¸ô§Þ³N¤uµ{¤p²Õ¬ãÀÀ¤§¤U¤@­Ó³s±µ³]³Æ¸ÑªR«×³q°T¨ó©w(Next Hop Resolution Protocol¡ANHRP)µ¥ªº¬[ºc¡A³Ð³y¤@­ÓµêÀÀ¸ô¥Ñ¾¹(Virtual Router)ªº¼Ð·Ç¤ÆÆ[©À¡A©Î¬O°ª³t°ÊºA¥æ´«ATMºô¸ôÀô¹Ò¤¤«Ø¥ß¸ô¥Ñ¥\¯à¡C

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    1. ºô¬q¤Á³Î°ÝÃD¡G¦b¶Ç²Îªº¸ô¥Ñ¾¹¤Á³Î¦¨¤lºô¸ô®É¡A¨C¤@ºô¬q»Ý¦Ü¤Ö®ö¶O¤T­ÓIP¡A¨ä¤¤¤@­Ó¥Nªí¦¹¤@ºô¬q¦ì§}¡A¥t¤@­Ó­t³dºô¬q¤§BroadcastÃѧO¡A²Ä¤T­Ó«h­t³dºô¸ô¸ô¥Ñ¡A¦b¦h­Óºô¸ô¤pºô¬q¤Á³Î¤U¡A±N³y¦¨ºô¸ôIP¸ê·½ªº®ö¶O¡C¥B·í¨Ï¥ÎªÌ²§°Ê¦Ü¨ä¥Lºô¬q®É¡A¨ä©Ò«ù¦³¤§IP¦ì§}¥²¶·§ó§ï¡A¹ïºô¸ôºÞ²z¤H­û¬O¤@ºØ­t¾á¡A¦P®É¦b³B²z¤pºô¬q¤§¸ô¥Ñ®É¥ç¬O¼vÅTºô¸ô®Ä¯à¤§­«­n¦]¯À¡C
    2. ºô¸ô³t«×´£ª@¡G¦b¶Ç²Îªº¸ô¥Ñºô¸ô¤W¡A¸ô¥Ñ¾¹±µ¦¬¨ì¥ô¦ó¤@«Ê¥]§¡±N¨ä©î¶}«á¤ÀªR«Ê¥]©Ê½è¡B§PÂ_¬O§_²Å¦X¦w¥þ¾÷¨îµ¥«á¡A¥æ¥Ñ¸ô¥Ñ³B²z¾¹¨M©w¨ä©Ò­n¸g¹L¤§¸ô®|¡A¥Ñ©ó¨C¤@«Ê¥]©Ò¸g¤§¸ô®|¡A¦]·í®Éªººô¸ôª¬ªp¤£¦P¦Ó¤£¦P¡A¦]¦¹¨C¤@«Ê¥]¶Ç°e(Forward)ªº³t«×«K¨ü¨ì¬Û·í¤jªº­­¨î¡C¥t¥~¦]¸ô¥Ñ¨M©w«Y¥Ñ³nÊ^­t³d¡A¨ä¶Ç°e²v(Forwarding Rate)«ÜÃø¹F¨ì·sªººô¸ô¶Ç¿é»Ý¨D(¨C¬í¦Ê¸U­Ó«Ê¥]¬°³æ¦ì)¡C
    3. ºô¸ô³Æ´©¯à¤O¡G¹ï¤@­Ó¥H¬ãµo¬°¥D­n¥ô°Èªº¬ãµo³æ¦ì¦Ó¨¥¡Aºô¸ôªºÃ­©w©Ê©M³Æ´©¥\¯à¬O¤Q¤À­«­nªº¡A¤]¬O¥»©Ò²Ä¤T´Áºô¸ô³W¹º¦Ò¶qªº­«ÂI¡A¥H¤U¦U¸`±N¸Ô¥[»¡©ú¥»©Ò¦b­±Á{¦¹°ÝÃD©Ò´£¥Xªº¬[ºc¡C
    4. ¨Ï¥ÎªÌºÝªº¶Ç¿é³t«×¡G¦b¥»©Ò²Ä¤G´Á©Ò°Ïºô¸ô¬[ºc¤¤ÁöµM¥D·F½uªº³t«×¤w´£ª@¬°155Mbps¤§³t«×¡A¦ý¨Ï¥ÎªÌºÝªº¶Ç¿é³t«×¤´µM¥u°±¯d¦b10 Mbps¡AµLªkº¡¨¬¦b°Êµe¼ÒÀÀ¹êÅç¤Î¹q¼tµû¦ô¼ÒÀÀµ¥­pµe©Î¤u§@ªº¤j¶q¸ê®Æ¶Ç¿é»Ý¨D¡C³Ì¥D­n²~ÀV¦b©ó¬J³]¸ô¥Ñ¾¹¥»¨­ªº§ë¸ê®Ä¯q°ÝÃD¡A¦]¦b·s¤@¥Nºô¸ô§Þ³Nªº¬x¬y¤¤¡A¸ô¥Ñ¾¹¤w«ÜÃøº¡¨¬·s§Þ³Nªº»Ý¨D¡A§Y©Î¸ô¥Ñ¾¹¥i¥H«j¤O¹F¦¨·s¤@¥Nºô¸ô®Ä¯à¡A¨ä¦¨¥»±N¹L©ó©ù¶Q¡C

°w¹ï¤W­z°ÝÃD¡A§Ú­Ì´£¥X´X­Ó¸Ñ¨M¤èªk¡G

    1. ±Ä¥Î²Ä¤T¼hºô¸ô¥æ´«§Þ³N¡G²Ä¤T¼hºô¸ô¥æ´«§Þ³N¬Oµ²¦X²Ä¤G¼hªººô¸ô¥æ´«§Þ³N©M²Ä¤T¼h¸ô¥Ñ§Þ³N¡A¦b¥¼¨Óªº¤é¯q¼ê«kªººô»Úºô¸ô¡A²Ä¤T¼h¥æ´«¾¹±N¨ú¥N¶Ç²Î¸ô¥Ñ¾¹¡A§@ªk¬O¦bºô¸ô¦¬¨ì±q¨Ï¥ÎªÌºÝ°e¥X²Ä¤@­Ó«Ê¥]®É¡A¥æ¥Ñ¸ô¥Ñ¾¹­pºâ©Ò»Ý¤§¸ô¥Ñ¡A¦pªG¦¹«Ê¥]ÄÝ©óªø¦s«¬(Long live)«Ê¥]¡A«hº¸«áªº«Ê¥]¤Å»Ý¦A¥æ²Ä¤T¼h¸ô¥Ñ³B²z¤F¡A¥i¥Hª½±µ¥Ñ¨ã¥æ´«³B²z¥\¯à¤§²Ä¤G¼h­t³d±N«Ê¥]©¹¤U¶Ç°e¡A¦p¦¹¥i´î¤Ö¸ô¥Ñ³B²zªº­t²ü¤Î¿ð©µ®É¶¡¡C
    2. ±Ò°ÊµêÀÀºô¸ô(VLAN, Virtual LAN)¥H¸Ñ¨Mºô¸ôIP¤Á³Îªº°ÝÃD¡AµêÀÀºô¸ô¥i¥H¨Ì¤£¦PÃþ§O¦pºô¸ô¥æ´«¾¹ªº°ð¡Bºô¸ô¥d¦ì§}(MAC address)¡B³q«H¨ó©w¡Kµ¥¡A³]©w¬°¦P¤@ºô¬q¡C
    3. ¬°¤F´£ª@¨Ï¥ÎªÌºÝ¤§¶Ç¿é³t«×¡A¥H¼W¶i¨Ï¥ÎªÌ§ó¦nªº¶Ç¿é«~½è¡A§Ú­Ì´£¥XFast Ethernet¤§¨Ï¥ÎªÌºÝ³t«×¡A¨Ã©óºô¸ô¥D·F¤W´£ª@¬°Load sharing¤§Âù³Æ´©½u¸ô¡C

4.2 ºô¸ô¬[ºc¤è®×

¥»¤å°w¹ï¥»©Ò©Ò°Ïºô¸ô§¹¦¨²Ä¤@¡B¤G´Áºô¸ô«á¤§ºô¸ôÀô¹Ò¡A´£¥X²Ä¤T´Á¦p¦ó´£ª@ºô¸ô«~½è¬°­«ÂI°Q½×¡A¦¹®É¥¿­È·s¤@¥N¥æ´«§Þ³N¥¼¦¨¼ô¡A¦Ó¶Ç²Î¸ô¥Ñ¾¹¤SµLªkº¡¨¬»Ý¨Dªº¨âÃø®É´Á¡A¥»©Ò¤D§ë¤J¦h¦ì¤H¤O¡A´£¥X¦hºØºô¸ô¬[ºc¡A¤ñ¸û¦U¬[ºcÀu¯ÊÂI«á¡A§¹¦¨²Ä¤T´Áºô¸ô³W¹º»P³]­p¡C

4.2.1 MPOA¬[ºc

¦p«e¤@³¹©Ò¤¶²Ð¡A¥»©Ò­Y±Ä¥ÎMPOA¬[ºc®É¡A¬O¥H²{¦³¸ô¥Ñ¾¹©MATM¥æ´«¾¹¬°¥D¡A±N­ì¦³ªº¸ô¥Ñ¾¹°h©~­I«á¡A¥HÃä½t¥æ´«¾¹¨ú¥N¡C¦¹¬[ºc¥D­n¬O¥HATM forum©Ò»s­qªº¼Ð·Ç¬°®Ö¤ß¡A¬OATMºô¸ô¸Ñ¨Mºô¸ô¼h¸ô¥Ñ¥æ´«ªº³Ì·s¬[ºc¤§¤@¡A¥¦¥i¥H²Å¦X¤U¤@¥Nºô¸ôªº»Ý¨D¡C·í¤@¸ê°T«Ê¥]¶i¤Jºô¸ô®É¡A¥ý¨ì¸ô¥Ñ¾¹¨ú±o©Ò­n³s½uªº»·ºÝ¦ì§}¡AÀH§Y«Ø¥ßVPI/VCI¸ô®|¡A¦Ó©¹«á¶Ç°eªº¤u§@´N¥æ¥ÑÃä½t³]³Æ°õ¦æ¡A¥H¸Ñ¨M¸ô¥Ñ¾¹¡yÀx¦s»P¶Ç°e¡zªº¯ÊÂI¡C¥»©Ò­Y±Ä¥Î¥»¬[ºc¡A·|²£¥Í¦p¤U´XÂI°ÝÃD¡G1.MPOA¼Ð·Ç¤§»s­q¬O¦b1997¦~9¤ë¤~§¹¦¨¡A±N¶·¤@¬qªø®É¶¡ªº¥Í²£´Á¤Î´ú¸Õ´Á¡A¦Ó¥B¬O§_·|¦³¦¹Ãþ²£«~¥X²{¡A¯à§_©ó1998¦~3¤ë«e¥¿¦¡¥X²£¡A¤´¬O­Ó¥¼ª¾¼Æ¡F2.¬J¦³¸ô¥Ñ¾¹¤´»Ý­t³droutingªº¥ô°È¡A¨ä³s½u³t«×©|µLªkº¡¨¬¥»©Òºô¸ôªº»Ý¨D¡F3.¬[ºc²~ÀV¡G¸ô¥Ñ¾¹ªº³B²z¾¹©M­IªOªº®Ä¯à¤£¨¬¡C

MPOAÁö¬°ATM Forum©Ò©w¸qªººô¸ô¼Ð·Ç¨ó©w¡AµM¦Ó¡A¦]¬°MPOA©ó1997¦~9¤ë©l¥¿¦¡§¹¦¨¼Ð·Ç¨î©w¡A¦Ó¥»©Ò²Ä¤T´Áºô¸ô¨ä®É¥¿³B©ó³W¹º§@·~¶¥¬q¡A¬O§_·|¦³¥¿¦¡MPOA²£«~°Ý¥@¡A¤´¤£±o¦Óª¾¡C¦]¦¹¥»¬[ºc¶È­­©ó¾Ç³N©Ê¤§±´°Q¡C¦ý²Ä¤T´Áºô¸ô³W¹º¨ü¦¹¬[ºc¼vÅT¬Æ²`¡A¦]¬°´£ª@ºô¸ô®Ä¯à¡A¨Ã¾É¤J·s¤@¥Nºô¸ô§Þ³N¬O²Ä¤T´Á³W¹º¥Ø¼Ð¤§¤@¡C

¹Ï4.1 ²Ä¤T´Á©Ò°Ïºô¸ô¬[ºc¹Ï¤@(MPOA)

4.2.2 Fast Ethernet

¥»©Ò³W¹ºªº²Ä¤G­Óºô¸ô¬[ºc(¦p¹Ï4.2)¬O¥HFast Ethernet¬°¥D¡A¦b¬J¦³¤­³¡¸ô¥Ñ¾¹¤U¦U¥[¸Ë¤@ÁûÃä½t³]³Æ¡A¨C¤@­ÓÃä½t³]³Æªº³s±µ°ð§¡¥i°õ¦æ10/100 Mbps¡A¨Ã¦³¤@­Ó¨ã100 Mbps¶Ç¿é¯à¤O¡A¥i¥H°õ¦æ¥þÂù¥\200 Mbps¤§Fast Ethernet³s±µ°ð³s±µ¦Ü¸ô¥Ñ¾¹¤W¡C°w¹ï±j¤Æ­«­n¥D¦øªA¾÷¤§³s½u¥\¯à¡A¦]Ãä½t³]³Æ¨ã¦³ATM¤§³s±µ¤¶­±¡A¨Ï¦øªA¾÷¤§ºô¸ô¼ÒÀÀ(LAN Emulation¡ALANE)³æ¯Â¤Æ¡A®e©öºÞ²z©MºûÅ@¡F¦¹Ãä½t³]³Æ¨ã¦³¨ú¥N©M³Æ´©ATM¥æ´«¾¹¤§¥\¯à¡AÃä½t³]³Æ©MATM¥æ´«¾¹¤¤¶¡¨Ã¦³³Æ´©Âù³s½u¡A¥H¼W¶iºô¸ô¤§Ã­©w©Ê¡C¦ý¥»¬[ºc¦³¦p¤U´X¶µ¯ÊÂI¡G1.¥»¬[ºcªº©¹«áºô¸ôÂX¥R±N¨ü¨î©ó¬J¦³¸ô¥Ñ¾¹¥»¨­ªºÂX¥R¯à¤O¡F2.¬[ºc²~ÀV¡G¸ô¥Ñ¾¹ªº³B²z¾¹©M­IªOªº®Ä¯à¤£¨¬¡C

¹Ï4.2 ²Ä¤T´Á©Ò°Ïºô¸ô¬[ºc¹Ï¤G(Fast Ethernet)

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4.2.3 Layer 3 ¥æ´«

¥»©Ò¸g¤W­z¤GºØºô¸ô¬[ºc¤ÀªR¤ñ¸û«á¡A±o¨ìªºµ²½×¬O¡G»P¨ä§ë¸ê¦b±N­±Á{²^¨Oªº¸ô¥Ñ¾¹¤W¡A¤£¦p±Nºô¸ôªº¥D·F¥þ³¡±Ä¥Î¨ã¸ô¥Ñ¥\¯àªº¸ô¥Ñ¥æ´«¾¹¤§²Ä¤T¼hºô¸ô¬[ºc(¦p¹Ï4.3)¡C¦]¬°±Ä¥Î¥»¶µ§@ªk¡A¤£¶È¥i±o¨ì§ó¨Îªººô¸ô®Ä¯à¡A¥ç¯àº¡¨¬¤é«áºô¸ôÀô¹Òªº´£ª@»Ý¨D¡C¥»¬[ºc¬O±N¬J¦³ªº¸ô¥Ñ¾¹¥þ³¡¥H¨ã¦³routing¥\¯àªº¥æ´«¾¹¨ú¥N¡A¨ä¤¤¤@³¡¥æ´«¾¹¨Ã¨ã¦³ATM¤¶­±¡C¸g¦h¤è¤F¸Ñ¡A¦¹¬[ºc¤w¦³¬Y¨Ç³æ¦ì±Ä¥Î¡A¬[ºc²³æ»PºÞ²z®e©ö¬O¨ä¥D­nÀuÂI¡CµM¦Ó¡A¥»¬[ºcªº®Ö¤ß¾÷¾¹(Cisco Light-Stream 1010 ATM ¥æ´«¾¹)¦p¦ó©M¶gÃ䪺²Ä¤T¼h¥æ´«¾¹¤¬³q¬O©Ò­±Á{ªº¥t¤@°ÝÃD¡A¦Ó¥B¬J³]ªº¸ô¥Ñ¾¹±ó¤§¤£¥Î¡A¥i¯à³y¦¨¸ê·½ªº®ö¶O¡A¥ç¬O¦³«Ý°Óºe¡C

¹Ï4.3 ²Ä¤T´Á©Ò°Ïºô¸ô¬[ºc¹Ï¤T(Layer 3)

4.2.4 Layer 3 ¤ÎATM¾ã¦XÂù³Æ´© (Layer 3 with ATM switching)

«e¤@¬[ºc¤w´x´¤·s¤@¥Nºô¸ô§Þ³Nªºµo®i¡A¦ý¤´¤£¯àº¡¨¬¥»©Ò²{¦³Àô¹Òªº»Ý¨D¡C²Ä¥|ºØºô¸ô¬[ºc¬O«e¤@¬[ºc¤§§ï¶i¡A§Y¦b©Ò¤º¼W«Ø¤@­Ó²Ä¤T¼h¥æ´«¾¹ªº¿W¥ß¥Dºô¸ô¡A¨C¤@¥æ´«¾¹©M­ì¦³ºô¸ô¤§ATM¤Î¸ô¥Ñ¾¹§¡¬Û¤¬³Æ´©³s±µ¡A¨Ï¦¨¬°Mesh¤§ºô¸ô¬[ºc¡A±Ò°ÊPNNI¤ÎOSPFµ¥³q«H¨ó©w¡A¥H¹F¨ì¨â§¹¥þ¬Û¤¬³Æ´©ºô¸ô¤§¥\¯à(¦p¹Ï4.4)¡F¥»¬[ºcÀuÂI¬°¥ô¦ó¤@ºô¬q¬G»Ù¡A§¡¥i«Ø¥ß¥t¤@³s³q¸ô®|¡A¥ç¥i§JªA«e¬[ºc¤£¤@­P©Ò³y¦¨ºûÅ@¤£©ö¤§§xÂZ¡F¨C¤@Ãä½t³]³Æ¦p¨ã¦³routing¥\¯à¡A«h¥i±Nºô¬q¤Á³ÎÀu¥ýµ¥¯Å¡Cºî¦X¥H¤W¥|ºØ¬[ºcªº³]­p¦Ò¶q¡A¥H²Ä¥|ºØ¬[ºc³Ì²Å¦X¥»©Òºô¸ô¤§»Ý¨D¡A¨ä²z¥Ñ¦p¤U¡G

    1. ¥i»´©ö¬[³]¤£¦Pºô¸ô¬[ºc¡AÂX¥R©Ê¡B¨ú¥N©Ê¨Î¡C
    2. ¥ô¤@¸ô®|§¡¥i¿W¥ß¹F¦¨¸ê®Æ¶Ç¿é¥\¯à¡C
    3. ¨â­Ó¬Û³Æ´©ºô¸ô¡Aí©w©Ê³Ì¨Î¡C
    4. Topology½Õ¾ã¨ã³Ì¤j¤§¼u©Ê¡C
    5. ¥i±NIPX¯d¦b¬J¦³¸ô¥Ñ¾¹¤§ºô¬q¤º¡A¥R¤ÀÀ³¥Î¬J³]¸ô¥Ñ¾¹ªº¥\¯à¡C
    6. ¥i±N©Ò¤º¥ÎIP©M©Ò¥~¥ÎIP¤À§O¦b¨â¤£¦Pºô¬q¤º¡A«K§Qºô¸ôºÞ²z»PÀ³¥Î¡C
    7. ¥i³]©wIP¤ÎMAC Address¤£¦P¸s²Õ¨Ã¦X¨Ö¨ä²Õ¦¨¡A§ùµ´µs¥ÎIPªº°ÝÃD¡C
    8. ºô¸ô­«¤ß²¾©¹ATM/Routing switch¤W¡ALight-stream 1010¥i¨Ñ¨ä¥Lµø°T·|ij©Î¹q¶Çµø°Tµ¥¤j¶qÀW¼e¥Î³~¤§¨Ï¥Î¡C

¹Ï4.4 ²Ä¤T´Á©Ò°Ïºô¸ô¬[ºc¹Ï¥|(Layer 3 with ATM)

4.3 ³q«H¨ó©w

±ýº¡¨¬Layer 3¤ÎATM¾ã¦XÂù³Æ´©ºô¸ô¨t²ÎÀô¹Ò¡A¤£¦Pªº¼t®a²£«~¶¡ªº³q«H¨ó©w¶¡¤§¬Û®e©Ê¡A¹ï¥»©Ò²Ä¤T´Áºô¸ô¬[³]ªº¦¨±Ñ¡A¨ã¦³ÃöÁä©Êªº¼vÅT¡C¥»©Ò²Ä¤T´Áºô¸ô¬[³]¹Lµ{¤¤¡A³z¹L¹ï·s¤@¥Nºô¸ô§Þ³Nªº¤F¸Ñ»P´x´¤¡A¬ð¯}¤£¦P¼tµP¶¡ATM¥æ´«¾¹ªº¬Û®e³q«H­­¨î¡A¥D­n¬O¦¨¥\ªº±Ò°Ê¤F¥H¤U´X¶µ³q«H¨ó©w¡A¤À­z¦p¤U¡C

4.3.1 PNNI(Private Network to Network Interface)

¦b¥»©Òªººô¸ô¸Ì¡A¤£¦P¼tµPªºATM¥æ´«§Þ³N¤¤³Ì­«­nªº¬OPNNI Àô¹Ò³]©w¡APNNI¬OATM©MATM©ÎATM©M²Ä¤T¼h¥æ´«¾¹¶¡·¾³q¤§©³¼h³q«H¨ó©w¡C©úÅã¦a¡A¥»©ÒªºATM¥æ´«¾¹ºô¸ô¤Î²Ä¤T¼h¥æ´«¾¹ºô¸ô¶¡·¾³q³Ì­«­nªº¤¸¥ó¤§¤@¬°PNNI¤§³q«H¨ó©w¡C

PNNI¬OATM Forum5©Ò­q¤§ATM°T¸¹(Signaling)¤Î¸ô¥Ñ(Routing)¤§¼Ð·Ç[6¡A7]¡A¥¦¦³¥|­Ó¥D­n¥Ø¼Ð¡G1.¨ÏATMºô¸ôºÞ²z§ó²³æ(Simplicity)¤Î§ó¨ã¦³¼u©Ê(Flexibility)¡F2.¨ÏATMºô¸ô¨t²Î§ó¨ã¦³ÂX¥R©Ê¡F3.¨ÏATMºô¸ô°õ¦æ§ó¦³®Äí©wªº¸ô¥Ñ­pºâ¡A¨Ãº¡¨¬ATM-QoSªº»Ý¨D¡F4.¨Ïºô¸ô¤§Àô¹Ò³]©w§ó²©ö¤Î¯à¦Û°Ê­×§ïºûÅ@ºô¸ôÀô¹Ò°Ñ¼Æ¡C

³s±µ¤G³¡¤£¦P¼tµPªºATM backbone Switch¤§¨ó©w¦³IISP¤ÎPNNI¡A¨âªÌ³Ì¤jªº¤£¦PÂI¦b©óIISP¥u´£¨ÑÀRºA¸ô¥Ñ(static routing)¥\¯à¡A¦ÓPNNI«h´£¨Ñ°ÊºA¸ô¥Ñ(dynamic routing)¥\¯à¡CIISPÀRºA¸ô¥Ñªº¯ÊÂI¬°¡Ga.³]©wÁcÂø¥B©ö²£¥Í¿ù»~¡Ab.µLªk´£¨Ñ³Æ´©(back-up)¯à¤O¡F¬Û¤Ïªº¡A¥Ñ©óPNNI±Ä¥Î°ÊºA¸ô¥Ñ¡A¥i¥H¦Û°Ê¸g¥Ñ³nÅé¿ï¾Ü³Ì¨Î¸ô®|¡A¦]¦¹¦b¬Y¤@¸ô®|Â_½u®É¡A¥i¥H¦A¿ï¾Ü¥t¤@³Ì¨Î¸ô®|¡A¹F¨ì¦Û°Ê³Æ´©¥\¯à¡C

¥»©Ò²Ä¤G´Áºô¸ô±Ä¥ÎCisco ATM¥æ´«¾¹¡A²Ä¤T´Áºô¸ô«h±Ä¥ÎXylan ATM¥æ´«¾¹¡A¦¹¤G¨t²Î¤¬°µ³Æ´©¡A¦]¦¹PNNIªº³]©w¬O³Ì¥D­nªº§Þ³NÃöÁä¡C

4.3.2 ELAN(Emulated LAN)

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¥»©Ò©^«ü¥Ü¥[¤J°ê¤º¤U¤@¥Nºô»Úºô¸ô(NGI¡ANext Generation Internet)À³¥Î­pµeªº¶}µo¡A°Ñ¥[¦¹­pµe¥i¨Ï¥»©Ò¹ï·s¤@¥Nºô»Úºô¸ôªº§Þ³N¤W§ó¯à¤F¸Ñ¡Aµ²¦X¥»©Ò¬J¦³ºô¸ô¸ê·½¡A°µ³Ì¦³®ÄªºÀ³¥Î¡A¥H´£¤É¥»©Ò¬ãµo¦¨®Ä¡CºîÆ[¤W­z¡Aºô¸ôÀ³¥Î»Ý¨Dªº¤£Â_ÂX¼W¡A«P¨Ïºô¸ô¬ì§Þªº§ó·s¡A¤]¼W¥[¤Fºô¸ô³W¹º³]­pªº§xÃø«×¡A³W¹º³]­pªÌ°£¶·¤F¸Ñ¥»©Òºô¸ô²{¦³ª¬ªp©M»Ý¨D¥~¡A§óÀ³¯à´x´¤¸ê°T©Mºô¸ô¬ì§Þªº³Ì·s°ÊºA¡C¬°°t¦X¤é«áªºª@¯Å¡A¥»©Ò±N¤Àºô¸ô·s§Þ³N¡Bºô¸ôºÞ²z©Mºô¸ô¦w¥þ¤T¤è­±¶i¦æ¡F¦bºô¸ô·s§Þ³N¤W¡Agigabit router¡BNGI¤ÎIPV6¬O¥D­n­«ÂI¡C¦bºô¸ôºÞ²z¤W¡A±NµÛ­«©óSNMP¡BRMON2ºô¸ôºÞ²z¸ê®Æ®wªº²Î­p¤ÀªRÀ³¥Î»P·s¤@¥NÀ³¥Î¨t²Î¾É¦Vªººô¸ôºÞ²z¤u¨ãªºÀ³¥Î¡Fºô¸ô¦w¥þ¤è­±«h¶·°¼­«±j¤Æ¥»©Ò©Ò¤º¨¾¤õÀð¨t²Î»P¥D¦øªA¾÷ªº¨t²ÎºÞ²z¡B¨¾¬r³nÅ骺§ó·s»Pºô¸ô¹wĵ¨t²Îªº«Ø¥ßµ¥¤u§@¡C




6. °Ñ¦Ò¤åÄm

[1]Black, Uyless D., "ATM :Foundation for Broadband Networks", Prentice-Hall, 1995

[2] ATM forum Technical Committee, "Multi-Protocol Over ATM Version 1.0", AF-MPOA-0087.000, July 1997

[3] Peter Newman, Greg Minshall, and Tom Lyon, "IP Switching : ATM Under IP", Ipsilon Networks Inc., http://www.iprg.nokia.com/about/technology/paper/newman0001.htm

[4]. Y. Rekhter, B. Davie, D. Katz, E. Rosen, G. Swallow, "Cisco Systems' Tag Switching Architecture Overview", RFC 2105, Cisco Systems, Inc., February 1997

[5].Gigabit Ethernet Alliance, " White Paper :Gigabit Ethernet ", June 1998, http://www.gigabit-ethernet.org/technology/whitepapers/gige_0698/papers98_toc.html

[6]. ATM forum Technical Committee, "PNNI Version 1.0", AF-PNNI-0055.000, Mar 1996

[7]. ³¯´º³¹, "The PNNI architecture", °ê¥ß¤¤¥¿¤j¾Ç, Oct 1996

[8]. ATM forum Technical Committee, "LAN Emulation over ATM 1.0", AF-LANE-0021.000, Jan 1995

[9]. "White Paper: Auto Tracker Virtual LAN Architecture", xylan Corp., http://www.xylan.com/whitepaper/autotrk/main.html

[10]. J. Moy, "OSPF version 2", RFC 2178, Cascade Communications Corp., July 1997

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