PIM-SM¢ÙÊÇÒ»ÖÖÊʺÏÓÚÔÚÏ¡Êè»·¾³ÏÂʹÓõĶಥЭÒé¡£Ëùν“Ãܼ¯”ºÍ“Ï¡Êè”Ö¸µÄÊÇÍøÂçÖÐ×é³ÉÔ±µÄÃܶÈ¡£¼ÙÈçÍøÂçÖÐÒ»¸öÇøÓò³öÏÖÖÁÉÙÒ»¸ö×é³ÉÔ±µÄ¸ÅÂʺܸߣ¬¼´Ê¹Õâ¸öÇøÓòºÜС£¬ËüÒ²ÊÇÒ»¸ö“Ãܼ¯”ÇøÓò¡£·´Ö®ÔòÊÇ“Ï¡Êè”ÇøÓò¡£ÓÉÓÚÏ¡ÊèÇøÓòµÄ×é³ÉÔ±ºÜÉÙ£¬²»ÄܲÉÓÃÃܼ¯ÇøÓòµÄ¼òµ¥µÄÖÜÆÚÐÔÀ©É¢¡¢¼ôÖ¦µÄ·½·¨½øÐжಥ´«Ê䣨·ñÔòÍøÂçµÄ×ÊÔ´²»×ãÒÔÓ¦¸¶Æ俪Ïú£©£¬ËùÒÔ¿ª·¢ÁËPIM-SMЭÒé¡£

Ëùν“ЭÒéÎ޹ؔ£¬ÊÇÖ¸¸Ã¶à²¥Ð­Òé²»ÒÀÀµÓÚÈκÎÌض¨µÄµ¥²¥Ð­Ò飨ÈçRIP¢Ú¡¢OSPF¢ÛµÈ£©£¬¶øÊÇÖ±½ÓÀûÓõ¥²¥Â·Óɱí×÷Ϊ¶à²¥Â·ÓÉÐÅÏ¢µÄ»ù´¡¡£ÕâÖÖ¶ÀÁ¢µÄºó¹ûÊÇ£¬Â·ÓÉÆ÷²»ÊÔͼ¼ÆËãרÃŵĶಥ·ÓÉ£¬Ëü¼ÙÉè´ÓAµ½BºÍ´ÓBµ½AµÄµ¥²¥Â·ÓÉ×î¶Ì·¾¶ÊǶԳƵÄ¡£

ÈçÇ°ËùÊö£¬ÔÚÏ¡Êè»·¾³ÏÂÊDz»ÊʺϲÉÓüòµ¥µÄÀ©É¢ºÍ¼ôÖ¦Ëã·¨µÄ¡£ËùÒÔPIM-SM½è¼øÁËÓкËÊ÷£¨CBT£©µÄËã·¨£º

¹¹ÔìÒ»¿ÃCBTÐèÒª´ÓÑ¡ÔñÒ»¸ö"ºË"¿ªÊ¼£¬¼´ÍøÂçÖн«»á³ÉΪ¶à²¥×éÖÐÐĵÄÒ»¸ö¹Ì¶¨µã£¬È»ºó½ÓÊÕ·½¾ÍÏòÕâ¸ö"ºË"·¢ËÍ"¼ÓÈë"±¨ÎÄ¡£ËùÓеÄÖмä·ÓÉÆ÷¶¼»á½ÓÊÕÕâ¸ö±¨ÎÄ£¬²¢°Ñ½ÓÊոñ¨ÎĵĽӿڱê¼ÇΪÊôÓÚÕâ¸ö×éµÄÊ÷¡£Â·ÓÉÆ÷ÐèҪΪÿ¸ö×é±£´æÒ»·Ý״̬ÐÅÏ¢£¬ÁгöËùÓÐÊôÓÚÏàÓ¦Ê÷µÄ½Ó¿Ú¡£Èç¹û½ÓÊÕµ½"¼ÓÈë"±¨ÎĵÄ·ÓÉÆ÷ÒѾ­ÊÇÊ÷ÖеÄÒ»¸ö³ÉÔ±£¬ÄÇôËü¾ÍÖ»ÔÙ±ê¼ÇÒ»´Î½Ó¿ÚÊôÓÚ×飻Èç¹ûÕâÊÇ´Ë·ÓÉÆ÷ÊÕµ½µÄµÚ1¸ö¼ÓÈëÖ¸ÁÄÇôËü¾Í»áÏòºËµÄ·½ÏòÔÙ½øÒ»²½×ª·¢´ËÖ¸Áî¡£

CBTÏ൱ÓÚΪÿ¸ö×齨Á¢Ò»¸öÉú³ÉÊ÷¡£¶ÔËùÓеÄÔ´Õ¾µãÀ´Ëµ£¬Õâ¿ÃÊ÷¶¼ÊÇÏàͬµÄ£¬±ÈÆðRPF¢ÜÀ´£¬ËüµÄÓŵãÊÇÖ»ÐèÒª¶Ôÿ¸ö×é¼Ç¼һ¸ö״̬£¨¼´£¨*£¬G£©£©£¬¶ø²»ÊÇΪһ¸ö×éºÍÔ´Õ¾µã¶Ô¶¼¼Ç¼һ¸ö״̬£¨¼´£¨S£¬G£©£©¡£

CBTÒ²ÓÐÒ»¸öȱµã£¬¼´Ä³Ð©Ô´Õ¾µãºÍijЩ½ÓÊÕÕßÖ®¼äµÄ·¾¶ÓпÉÄܲ»ÊÇÀíÏë´ð°¸µÄ£¬¶øÇÒCBTÒ²´æÔÚ´«Ê伯ÖеÄÎÊÌ⣬ÒòΪÀ´×ÔÒ»¸ö¸ø¶¨×éµÄËùÓÐÔ´Õ¾µãµÄÁ÷Á¿¶¼½«´©¹ýÏàͬµÄÁ´Â·¡£

CBTµÄÒ»´óÓŵãÔÚÓÚËü½«¶à²¥Êý¾Ý±¨µÄÀ©Õž«È·ÏÞÖÆÔÚËùÓнÓÊÕÕß·¶Î§ÄÚ¡£Õâһ˼Ïë±ÈÆðRPF½«µÚ1¸ö·Ö×éÔÚ±»¼ôÖ¦ÒÔÇ°´«Ë͸øÕû¸öÍøÂçµÄ·½Ê½ÓÐÑϸñµÄÇø±ð¡£ÁíÍ⣬CBT»¹ÓÐÒ»¸öÖØÒªµÄÓŵ㣬ͬʱҲÊÇÔì³ÉCBTµÄ¿ÉÉìËõÌØÐÔµÄÔ­Òò£¬Õâ¾ÍÊÇ״̬ÊýÁ¿ÉÙ¡£ÕâÀ״̬ÊýÁ¿Ö»È¡¾öÓÚ×éµÄÊýÄ¿£¬¶ø²»È¡¾öÓÚÔ´Õ¾µãºÍ×éÅä¶ÔµÄÊýÄ¿¡£

ÔÚPIM-SMЭÒéÖУ¬ÎÒÃÇ°ÑÕâ¸öºË³Æ֮Ϊ¼¯»áµã£¨RP£©£¬°Ñ´ÓRP¹¹½¨µÄÓкËÊ÷³ÆΪRPÊ÷£¨RPT£©¡£

ΪÁËÀûÓÃRPÊ÷µÄÓŵ㣬ͬʱΪÁ˱ÜÃâÆäȱµã£¬PIM-SMÉè¼ÆÁË´ÓRPTµ½ÒÀ¾ÝÔ´-×é¹ØϵµÄ¡¢ÒÔԴΪ¸ùµÄ×î¶Ì·¾¶Ê÷£¨SPT£©µÄÇл»¡£ÆäÇл»µÄÃż÷±äµÍÊÇĿǰеÄЭÒé²Ý°¸ºÍÔ­ÓÐRFC2362µÄÒ»¸öÇø±ð£¬ÕâÖÖÇø±ðÓÐÀûÓÚ»ùÓÚÓ²¼þת·¢µÄÈý²ã½»»»»úµÄʵÏÖ¡£

PIM-SMЭÒéÖÐÒª½â¾öµÄÁíÒ»¸öÎÊÌ⣬¾ÍÊǼ¯»áµãµÄÑ¡ÔñÎÊÌ⡣Ŀǰͨ³£²ÉÓõķ½·¨ÊÇÓÃBootstrap Router (BSR)»úÖÆ£¬¸Ã»úÖƵÄÃèÊöÓÐרÃŵÄЭÒé²Ý°¸¡£

½áÊøÓPIM-SM Êǵ±Ç°×é²¥ÁìÓòÓ¦Óù㷺µÄ×鲥·ÓÉЭÒ飬ÅäÖüòµ¥£¬ÊÊÓÃÓÚ´óÐ͵ÄÍøÂ磬²¢ÇÒ¿ÉÒÔ½áºÏÆäËûµÄ×鲥ЭÒé(MSDP ¢ÝµÈ)½øÐй¤×÷£¬ÕâʹµÃÆäÀ©Õ¹ÐԽϺ᣾ݴˣ¬ÎÒÃÇÈÏΪPIM-SM ÔÚ×é²¥ÖлáµÃµ½¸ü¹ã·ºµÄÓ¦Óá£

¹«º£²Ê´¬¡¤6600ÍøÂçÊý¾ÝÖÐÐĺËÐĽ»»»»úRG-S12000ϵÁÐƾ½èÆä×ÔÉíµÄ¼¼ÊõÓÅÊÆ£¬¿ÉÖ§³ÖMPLSºÍPIM-SM¼¼Êõ£¬Âú×ãÆóÒµºÍÔËÓªÉÌ¿Í»§¶àÖÖÀàÐ͵ÄÒµÎñÐèÒª¡£

¢Ù PIM-SM£ºProtocol Independent Multicast-Sparse Mode£¬Ð­ÒéÎ޹ضಥ´«ËÍÏ¡Êèģʽ

¢Ú RIP£ºRouting Information Protocol£¬Â·ÓÉÐÅϢЭÒé

¢Û OSPF: Open Shortest Path First£¬¿ª·Åʽ×î¶Ì·¾¶ÓÅÏÈ

¢Ü RPF£ºReverse Path Forwarding£¬·´Ïò·¾¶×ª·¢

¢Ý MSDP£ºMulticast Source Discovery Protocol£¬×é²¥Ô´·¢ÏÖЭÒé