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Ç¥ÁعøÈ£ TTAE.IF-RFC8964 ±¸Ç¥ÁعøÈ£
Á¦°³Á¤ÀÏ 2021-12-08 ÃÑÆäÀÌÁö 49
ÇѱÛÇ¥Áظí DetNet µ¥ÀÌÅÍ Æò¸é: MPLS
¿µ¹®Ç¥Áظí Deterministic Networking (DetNet) Data Plane: MPLS
Çѱ۳»¿ë¿ä¾à ±âÁ¸ PW(PseudoWire) ĸ½¶È­, MPLS-TE(MPLS Traffic Engineering) ĸ½¶È­¿Í ¸ÞÄ¿´ÏÁò À» È°¿ëÇÏ°í DetNet ±¸Á¶ ¹× µ¥ÀÌÅÍ Æò¸é ÇÁ·¹ÀÓ¿öÅ©¸¦ ±â¹ÝÀ¸·Î MPLS ÆÐŶ ±³È¯ ³×Æ®¿öÅ©¸¦ ÅëÇØ ÀÛµ¿ÇÏ´Â DetNet µ¥ÀÌÅÍ Æò¸éÀ» ±ÔÁ¤ÇÑ´Ù.
DetNet ±¸Á¶´Â DetNet °ü·Ã µ¥ÀÌÅÍ Æò¸é ±â´ÉÀ» ¼­ºñ½º ÇÏÀ§ °èÃþ(Service sub- layer) °ú Æ÷¿öµù ÇÏÀ§ °èÃþ(Forwarding sub-layer)À¸·Î ¸ðµ¨¸µÇÑ´Ù. ¼­ºñ½º ÇÏÀ§ °èÃþÀº º¸È£ ¹× ÀçÁ¤·Ä°ú °°Àº DetNet ¼­ºñ½º ±â´É Á¦°ø¿¡ »ç¿ëµÇ°í, Æ÷¿öµù ÇÏÀ§ °èÃþÀº Æ÷¿öµùÀ» º¸ÀåÇÏ´Â ±â´É(³·Àº ¼Õ½Ç, Áö¿¬ ½Ã°£ º¸Àå ¹× ºñ ¼øÂ÷ Àü¼ÛÀÇ Á¦ÇÑ) Á¦°ø¿¡ »ç¿ëµÈ´Ù. DetNet µ¥ÀÌÅÍ Æò¸é¿¡¼­´Â »õ·Î¿î ±â´É ¼¼Æ®(ÆÐŶÀÇ º¹Á¦, Á¦°Å, Á¤·Ä ±â´É)µéÀÌ ¼­ºñ½º ÇÏÀ§ °èÃþ¿¡ °íÀ¯ÇÑ ÀÛ¾÷µéÀ» Á¦°øÇÑ´Ù.
¼­ºñ½º ÂüÁ¶ ¸ðµ¨À» »ç¿ëÇÏ¿© MPLS ±â¹Ý ÆÐŶ ±³È¯ ³×Æ®¿öÅ©(MPLS-based Packet Switched Network)¸¦ ÅëÇÑ DetNet µ¥ÀÌÅÍ Æò¸é ÀÛµ¿°ú DetNet Ç÷ÎÀÇ ¿Â ¿ÍÀ̾î ĸ½¶È­ ¸¦ ±ÔÁ¤ÇÑ´Ù. MPLS·Î ĸ½¶È­µÈ DetNetÀº, DetNet¿¡ ¿ä±¸µÇ´Â ¼öÁØÀÇ ¼­ºñ½º¸¦ Á¦°ø ÇÒ ¼ö ÀÖ´Â ´Ù¾çÇÑ ³×Æ®¿öÅ© ±â¼úÀ» ÅëÇØ Æ÷¿öµùµÉ ¼ö ÀÖ°í, MPLS·Î ĸ½¶È­µÈ DetNet Ç÷Π´Â ´Ù¾çÇÑ À¯ÇüÀÇ Æ®·¡ÇÈÀ» Æ÷¿öµùÇÒ ¼ö ÀÖ´Ù. DetNet MPLS°¡ ¼­·Î ´Ù¸¥ ³×Æ®¿öÅ© ±â¼ú À» ÅëÇØ ¼öÇàµÇ´Â ±¸Ã¼ÀûÀÎ ¹æ¹ý°ú ´Ù¾çÇÑ Æ®·¡ÇÈ À¯Çü¿¡ ´ëÇÑ ±¸Ã¼ÀûÀÎ ¼¼ºÎ »çÇ×Àº ÀÌ ¹®¼­¿¡¼­ ´Ù·çÁö ¾Ê´Â´Ù.
DetNet MPLS ¼­ºê ³×Æ®¿öÅ©¸¦ »ç¿ëÇÏ´Â IPÀÇ ¿¹´Â [RFC8939]¿¡ ÀÖ°í, DetNet MPLS´Â ÀÌ ¹®¼­ ¹Û¿¡¼­ Á¤ÀÇµÈ OAM(Operation, Administration, and Maintenance)°ú ¿¬°üµÈ ÄÁ Æ®·Ñ·¯ ±â´ÉÀ» »ç¿ëÇÒ ¼ö ÀÖÀ¸¸ç, DetNetÀÇ ¸ðµç µ¥ÀÌÅÍ Æò¸é¿¡ °øÅëÀûÀÎ ¹è°æ Á¤º¸´Â DetNet µ¥ÀÌÅÍ Æò¸é ÇÁ·¹ÀÓ¿öÅ© [RFC8938]¿¡¼­ ã¾Æº¼ ¼ö ÀÖ´Ù.
¿µ¹®³»¿ë¿ä¾à This standard specifies the DetNet data plane when operating over an MPLS Packet Switched Network(PSN). It leverages existing pseudowire(PW) encapsulations and MPLS-TE encapsulations and mechanisms. This standard builds on the DetNet architecture and data plane framework.
The DetNet architecture models the DetNet-related data plane functions as being decomposed into two sub-layers: a service sub-layer and a forwarding sub-layer. The service sub-layer is used to provide DetNet service functions, such as protection and reordering. At the DetNet data plane, a new set of functions(Packet Replication, Elimination and Ordering Functions(PREOF)) provide the tasks specific to the service sub-layer. The forwarding sub-layer is used to provide forwarding assurance(low loss, assured latency, and limited out-of-order delivery).
This standard specifies the DetNet data plane operation and the on-wire encapsulation of DetNet flows over an MPLS-based PSN using the service reference model. MPLS-encapsulated DetNet can be carried over a variety of different network technologies that can provide the level of service required for DetNet and MPLS-encapsulated DetNet flows can carry different types of traffic. However, the specific details of how DetNet MPLS is carried over different network technologies and the details of the types of traffic are out of scope for this standard.
An example of IP using DetNet MPLS sub-networks can be found in [RFC8939]. DetNet MPLS may use an associated controller and OAM functions that are defined outside of this document and background information common to all data planes for DetNet can be found in the DetNet data plane framework [RFC8938].
±¹Á¦Ç¥ÁØ IETF RFC8964
°ü·ÃÆÄÀÏ TTAE.IF-RFC8964.pdf TTAE.IF-RFC8964.pdf            

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