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ÔçÔÚ1997Ä꣬MPLSÍøÂçµÄÍÆ³ö£¬Æäѡȡ±êÇ©»¥»»£¬Ò»¸ö±êÇ©¶ÔÓ¦Ò»¸öÓû§Êý¾ÝÁ÷µÄ·½Ê½£¬¼«¶ÈÒ×ÓÚÓû§¼äÊý¾ÝµÄ¸ôÀ룬ÀûÓ÷ֱæ·þÎñϵͳµÈÏеؽâ¾öÀ§ÈÅ´«Í³IPÍøÂçµÄQoS/CoSÎÊÌ⣬ͬʱMPLS×ÔÉíÌṩÁ÷Á¿¹¤³ÌµÄÄÜÁ¦£¬Äܹ»×î´óÏ޶ȵØÓÅ»¯ÅäÖÃÍøÂç×ÊÔ´£¬×Ô¶¯¼±¾ç½¨¸´ÍøÂç¹ÊÕÏ£¬Ìṩ¸ß¿ÉÓÃÐԺ͸߿¿µÃסÐÔ ¡£È»¶ø£¬ÎªÁËÂú×ãÔ½À´Ô½¶àµÄÀûÓÃÐèÒª£¬MPLS¼¼ÊõÔÚ´Óǰ20¶àÄêÒ»ÏòÔÚ×ö¼Ó·¨£¬Ö°Äܲ»ÐÝ·á˶µÄͬʱ£¬Ò²´øÀ´ÁËÖ´ÐкÍʹÓÃÉϵĸ´ÔÓÐÔ ¡£

 

Segment RoutingµÄ¸ÅÏëºÍ¼¼ÊõϵͳÔÚ2013Äê³õ´ÎÌá³ö£¬¶Ì¶ÌËÄÄê¼äÒѾ­»ñµÃÁËÒµ½çµÄ¿í·ºÖ§³Ö£¬²¢ÒѾ­ÔÚ¹úÄÚ±íÇ°ÑØÔËÓªÉ̵ÄÍøÂçÖÐÆðÍ·ÏÖʵ²¿Êð ¡£Segment RoutingµÄԴ·ÓɺÍÎÞ״̬¸öÐÔ£¬Ê¹µÃÆä³ÉΪSDN/NFVÔÚIPÍøÂç¸ßµÍÒ»²½·¢Õ¹µÄ¹Ø¼ü¼¼Êõ£¬Æä³¬´ó¹æÄ£×éÍøÄÜÁ¦Ò²ÊÇʵÏÖIPÍøÂç¶Ëµ½¶ËÔËÓªµ÷¶ÈºÍÍøÂç³Á¹¹µÄ»ù´¡ ¡£

 

Segment RoutingÊǼÌMPLSÖ®ºó£¬IPÁìÓò³ÁÒªµÄ´´Ð£¬µÃµ½ÁËÒµ½çµÄ¿í·ºÖ§³Ö£¬²¢Öð²½³ÉΪSDNµÄÖ÷Á÷ÍøÂç¼Ü¹¹³ß¶È ¡£

 

±¾ÎÄͨ¹ý½²ÊöSegment RoutingµÄµ®Éú¡¢²úÉúSRµÄÇý¶¯Á¦¡¢SRµÄ¹¤×÷·½Ê½¡¢SRµÄÓйػù´¡¸ÅÏëÒÔ¼°SRµÄÀûÓó¡¾°£¬´ø¸÷È˳õ²½ÒâʶSDNÍøÂçÐÂÐ˼¼ÊõSegment Routing ¡£

 

01 Ê²Ã´ÊÇSR£¿

 

Segment Routing£¬·Ö¶Î·ÓÉÊÇ»ùÓÚԴ·ÓÉÀíÏë¶øÉè¼ÆµÄÔÚÍøÂçÉÏת·¢Êý¾Ý°üµÄºÍ̸£¬½èÖúMPLSת·¢Æ½ÃæÊµÏÖÊý¾Ýת·¢£¬Segment Routing½«ÍøÂçõè¾¶·Ö³ÉÒ»¸ö¸ö¶Î£¬²¢ÇÒΪÕâЩ¶ÎºÍÍøÂçÖеÄת·¢½Úµã£¨Node£©·ÖÅä¶Î±êʶID£¬Í¨¹ý¶Ô¶ÎºÍÍøÂç½Úµã½øÐÐÓÐÐòµÄ·ÖÁУ¨Segment List£©£¬µÃµ½Ò»ÌõÆëÈ«µÄת·¢õè¾¶ ¡£

 

02 SRµÄµ®Éú

 

¹ØÓÚSR¶¨ÃûµÄÆðÔ´£¬´«ÎÅÆðÔ´ÓÚSRÏîÄ¿×éµÄÒ»´ÎÂÞÂí¾­Àú£¬SRÃû×ÖÓÉÀ´ÓړͨÍùÂÞÂí֮·”£¬Òâ´óÀûÓïÖÐSR¼´“Strade Romane”£¬Ò²¾ÍÊÇÎÒÃÇʱʱÌýµ½µÄ“All roads lead to Rome”£¬“ÌõÌõ´ó·ͨÂÞÂ픣¬Í¨¹ý×éºÏ¶àÌõ··£¬ÂÞÂíÈËÄܹ»È¥ÍùÂÞÂíµÛ¹úÄÚµÄËÁÒâ´¦Ëù ¡£

 

 

Clarence FilsfilsÊÇSegment Routing¼¼ÊõµÄ·¢ÏÖÕߺÍÍÆ¶¯Õߣ»ÔÚ˼¿Æ¹¤×÷µÄ 20 Äê¼ä£¬Clarence Filsfils Õ¼Óм«Æä·á˶µÄ´´Ð¡¢²úÒµ»¯¡¢Êг¡ÍƹãºÍÏÖʵ²¿Êð¾­Ñ飬Êܵ½È«ÇòÔËÓªÉÌ¡¢OTT ºÍ´óÐÍÆóÒµ¿Í»§µÄ×ð¾´ºÍÐÅÈÎ ¡£

 

  • 2012Ä꣬ÏîÄ¿×é³ÉÁ¢
  • 2015Ä꣬SR¼Ó¿ì³ÉÊ죬˼¿ÆÂ·ÓÉÆ÷Ö§³ÖSR-TEºó£¬Óû§ÆðÍ·ÅúÁ¿²¿Êð
  • 2016Ä꣬¹úÄÚ±íÇ°ÑØµçÐÅÔËÓªÉ̺ͻ¥ÁªÍø¹«Ë¾ÆðͷʹÓÃSR¼¼Êõ
  • 2017Ä꣬Linux4.0Õýʽ°æ±¾ÆðÍ·Ö§³ÖSR
  • 2018Ä꣬PFC³ß¶È£ºPFC8402£¬ÂäʵSR¼¼Êõ

 

03 SR²úÉúµÄÇý¶¯Á¦

 

 

ÓÅÑŵÄMPLSÊý¾ÝÆ½ÃæºÜÉÙÊܵ½ÌôÕ½£¬µ«ÊÇÈËÃÇÔ½À´Ô½ÏÔÖøµÄ¸Ð´¥µ½MPLS¾­µäµÄ½ÚÔìÆ½Ãæ£¨LDP¡¢RSVP-TE£©¹ýÓÚ¸´ÔÓ£¬ÇÒ²»×ã¿ÉÀ©´óÐÔ ¡£

 

SRµÄ¼¼ÊõÓÅÊÆ£¬½øÒ»²½Çý¶¯ÁËSRÀûÓõĴó¹æÄ£²¿ÊðÀûÓà ¡£

 

 

04 SRµÄ¹¤×÷·½Ê½

 

ÔÚSRÏîÖ÷ÕÅÔçÆÚ£¬SRÏîÄ¿×éÓ÷ɻúÐÐÀîתÔ˵ÄÐÐÀî±êÇ©ÏòûÓÐÓйؼ¼Êõ²¼¾°µÄÈËÔ±Ú¹ÊÍ£¬SRÊÇÈôºÎ¹¤×÷µÄ ¡£ÒÔÒ»¸öÐÐÀ´ÓµÂ¹úĽÄáºÚ»ú³ ¡£¨MUC£©µ½ÈÕ±¾³ÉÌï»ú³ ¡£¨NRT£©£¬õè¾¼ûÀ¹úÑÇÌØÀ¼´ó»ú³ ¡£¨ATL£©ÎªÀý ¡£

 

 

ÈçÉÏͼ£¬µ±Ò»¸ö°ü¹üÔÚʼ·¢»ú³¡¸øÐÐÀîÌùÉÏÒ»¸ö±êÇ©“ĽÄáºÚ£¨MUC£©àÑÇÌØÀ¼´ó£¨ATL£©à³ÉÌNRT£©”£¬ÕâÑùµÄ»°£¬´«ÊäϵͳÖеÄÿ¸öÕ¾µã²»±ØÒªÔÙ¼ø±ðµ¥¸öÐÐÀîµÄÆëÈ«õè¾¶£¬Ö»±ØÒª¼ø±ð¼¸Ç§¸ö»ú³¡µÄ´úÂ룬ÈçMUC´ú±íĽÄáºÚ»ú³¡µÈ£¬Í¨¹ýÐÐÀîµÄ±êÇ©´úÂ룬¾ÍÄܹ»ÒÀÕÕ±êÇ©½«ÐÐÀî·¢ÍùÖ¸¶¨µÄÖ÷Õŵػú³¡ ¡£

 

SRµÄ×ö·¨ÆäʵһÑù£¬Ò»¸öprefix segment´ú±íÒ»¸ö»ú³¡´úÂ룬±¨ÎÄÖеÄsegment´ú±í×ÅÐÐÀîÉϵıêÇ©£¬Ô´½Úµã֪·Êý¾Ý°üµÄÌØ¶¨ÒªÇó£¬ÒÀÕմ˱àÂëΪsegmentÁбí£¬Ñ¹È뱨ͷÖУ¬ÍøÂçÖÐµÄÆäËûÉ豸²»±ØÒªÖªÂ·´ËÊý¾Ý°üµÄÌØ¶¨ÒªÇó£¬Ö»±ØÒªÖªÂ·£¬Ôõô´¦ÖÃprefix segment¼´¿É ¡£

 

 

ÉÏͼÖУ¬µ±Ò»¸öÊý¾Ý°ü´Ó£¬Site_A±ØÒª×ª·¢µ½Site_Bʱ£¬µ±Site_AΪÊý¾Ý°üѹÈëÒ»¸ö£¨16002à28003à16006£©segment-listʱ£¬µ±õè¾¶ÖеÄÍøÂç½Úµã½øÐÐת·¢Ê±£¬Ö»±ØÒªÒÀÕÕ±êÇ©°¤´Îȥת·¢Êý¾Ý°ü£¬²¢²»±ØÒª¹Ø×¢Êý¾Ý°üµÄÆðÔ´µÈ£¬×îÖÕÁ÷Á¿»áÒÀÕÕͼÖÐ×ÏÉ«ÐéÏß½øÐÐת·¢ ¡£

 

05 SRÓйظÅÏë

 

Դ·ÓÉ

 

Դ·ÓÉÆ÷ΪҪת·¢µÄÊý¾Ý°üÑ¡ÔñÒ»¸öõè¾¶£¬²¢½«Æä×÷Ϊsegment-list±àÂëµ½Êý¾Ý°üµÄ°üÍ·ÖУ¬ÍøÂçÖÐÆäÓàµÄ·ÓÉÆ÷£¬Ö´ÐбàÂëµÄÖ¸Á²¢½øÐÐת·¢ ¡£

 

Segment Routingת·¢Æ½Ãæ

 

MPLSת·¢Æ½Ãæ

 

  • Segment-ListÌåÏÖΪMPLSµÄ±êǩջ

  • Segment RoutingÄܹ»ÀûÓÃÏÖÓеÄMPLSÊý¾ÝÆ½Ãæ

  • Segment¼´MPLS±êÇ©

  • ¿ÉÓÃÓÚIPv4»òIPv6µØÖ·´Ø

 

IPv6ת·¢Æ½Ãæ

Segment-ListÌåÏÖΪ·ÓÉÀ©´ó±¨Í·ÖеĶà¸öIPv6µØÖ·

 

È«¾ÖSegment¡¢±¾µØSegment

 

Global Segment£¨È«¾ÖSegment£©

 

  • SRÓòÖÐÈÎÒ»½Úµã¶¼ÁìÂÔSegmentµÄÓйØÖ¸Áî

  • SRÓòÖеÄÿ¸ö½Úµã¶¼×°ÖÃÁ˸ÃSegmentµÄÓйØÖ¸Áî

  • ÔÚMPLS SRÖÐÌåÏÖΪSRGBÖеÄÈ«¾Ö±êǩֵ

 

Local Segment£¨±¾µØSegment£©

 

  • Ö»ÓиÃSegmentµÄʼ·¢½ÚµãÁìÂÔ¸ÃSegmentµÄÓйØÖ¸Áî

  • MPLS SRÖÐÌåÏÖΪ±¾µØ·Ö·¢µÄ±êÇ©

 

 

ÒÔR1àR3µÄÁ½Ìõõ辶ΪÀý£¬À¶É«õè¾¶ÖеÄ{16002,16003}£¬ÎªÈ«¾Ösegment£¬SRÓòÖÐÈÎÒ»½Úµã¶¼ÁìÂÔSegmentµÄÓйØÖ¸ÁÁ÷Á¿ÒÀÕÕR1àR2àR3ת·¢£»ºìÉ«õè¾¶ÖÐ{16004,27003,16003}£¬ÆäÖÐ27003λ±¾µØsegment£¬Êèµ¼Á÷Á¿×ª·¢ÖÁR4ÏνÓR5µÄ»¥ÁªÁ´Â·ÖÐµÄÆäÖÐÒ»¸ùÁ´Â·£¬Á÷Á¿ÒÀÕÕR1àR4à(27001¶ÔÓ¦Á´Â·)àR5àR3½øÐÐת·¢ ¡£

 

È«¾Ö±êÇ©Ë÷Òý

 

Global Segment£¨È«¾ÖSegment£©Ê¼ÖÕÒÔ“SRGB£¨±êÇ©ÁìÓò£©”+index£¨Ë÷Òý£©×é³É

 

  • SRÓòÖУ¬Ë÷Òý±ØÐëΨһ

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  • ÔËÓªÉÌĿǰ¾ùÒªÇóʹÓÓGlobalģʽ”

  • Global Segment¼ò»¯ÁËÍøÂçÔËÓª³É±¾

  • ¸÷³§ÉÌSRGB½ç˵·ÖÆç£¬ÈçCiscoʹÓÃ16000-23999

 

ÓµÓÐÒ»ÑùSRGBµÄ¼¸¸öÒæ´¦

 

  • ±êǩӵÓоø¶ÔÖµ£¬¼´SRGB + Index

  • SRGB¹Ì¶¨ºó£¬IndexÄܹ»ÓÉIGB/BGP·ÖÅä

 

Segment Routing½ÚÔìÆ½Ãæ

 
 

SRµÄ½ÚÔìÆ½Ãæ¿ÉËùÒÔIGP£¨ISIS¡¢OSPF£©»òBGP

 

IGP×÷Ϊ½ÚÔìÆ½Ãæ

 

IGP·Ö·¢µÄSegment·ÖΪÁ½ÖÖ£¬Îª¹¹½¨×ª·¢õè¾¶µÄ¸ù»ù¹¹½¨Ä£¿é

 

  • Prefix Segment – ǰ׺¶Î£¬ÓÖ³ÆPrefix-SID

  • Adj Segment – ÁڽӶΣ¬ÓÖ³ÆAdj-SID

 

IGP Prefix-SID

 

  • ͨ³£¸ø/32 loopback½Ó¿Ú·ÖÅä±êÇ©

  • Ô¢Ò⣺Êèµ¼Á÷Á¿ÑØ×ÅÖ§³ÖECMP×î¶Ìõè¾¶È¥ÍùÓë¸ÃSegmentÓйØÁªµÄǰ׺

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  • Global Segment

  • Segment = SRGB + Index

  • Ë÷Òýͨ¹ýISIS/OSPF·Ö·¢

 

 

IGP Adj-SID

 

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BGP×÷Ϊ½ÚÔìÆ½Ãæ

 

ʹÓÃBGPÐÂÊôÐÔ£¬Type 40

 

·Ç±ØÑ¡£¬¿É´«µÝÊôÐÔ

 

BGPÖÐʹÓöÀÁ¢µØÖ·´Ø address-family Label unicast

 

BP·Ö·¢µÄSegment·ÖΪÁ½ÖÖ£¬Îª¹¹½¨×ª·¢õè¾¶µÄ¸ù»ù¹¹½¨Ä£¿é

 

  • Prefix Segment – ǰ׺¶Î£¬ÓÖ³ÆPrefix-SID

  • BGP EPE£¨Egress Peer Engineering£©À©´ó

 

BGP Prefix-SID

 

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  • Global Segment

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BGP EPE£¨Egress Peer Engineering£©À©´ó

 

  • Local Segment

  • ÓÃÓÚΪ¶ÔµÈÌå·ÖÅäPeer-Node SID¡¢Peer-Adj SIDºÍPeer-Set SID

 
 

 

06 SRµÄÀûÓó¡¾°

 
 
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R1àR2£ºÖ»ÄÜͨ¹ý¸ºÔØÆ½ºâ»òÇ¿Ôìµ¥Ò»õè¾¶

2£©ÓÐSegment Routing

 

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2£©ÓÐSegment Routing

 

R1àR2£º·ÖÆçÒµÎñ×ÔÓɽç˵£¬¶¯Ì¬¹æ»®£¬Äܹ»Æ¾¾Ý·ÖÆçµÄÒµÎñÐèÒª½ç˵·ÖÆçµÄõè¾¶£¬±£¾þÇͺ¦ÒµÎñµÄת·¢

 

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