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Ç¥ÁعøÈ£ TTAE.IF-RFC6437 ±¸Ç¥ÁعøÈ£
Á¦°³Á¤ÀÏ 2014-12-17 ÃÑÆäÀÌÁö 29
ÇѱÛÇ¥Áظí IPv6 ÇÃ·Î¿ì ·¹ÀÌºí ¸í¼¼
¿µ¹®Ç¥Áظí IPv6 Flow Label Specification
Çѱ۳»¿ë¿ä¾à IPv6 Çì´õÀÇ 20 ºñÆ® Ç÷Π·¹À̺í Çʵå´Â ÇϳªÀÇ Ç÷Π¼ÓÇÑ ÆÐŶ¿¡ ¹øÈ£¸¦ ºÎ¿©ÇÏ´Â µ¥ »ç¿ëµÈ´Ù. Ç÷Π·¹ÀÌºí °ªÀÌ ºÎ¿©µÇÁö ¾ÊÀº °ÍÀº 0 °ªÀ» °¡Áö¸ç, 0ÀÌ ¾Æ´Ñ Ç÷Π·¹ÀÌºí °ªÀº ¿î¿µ»óÀÇ º¸¾È ¹®Á¦°¡ ¾ø´Â ÇÑ ¸ñÀûÁö±îÁö º¯°æµÇ¾î¼­´Â ¾È µÈ´Ù. »óÅ ºñº¸Á¸Çü ½Ã³ª¸®¿À¿¡¼­ Ç÷Π±â¹Ý ÆÐŶ ºÐ·ù(classification)°¡ °¡´ÉÇϵµ·Ï ¿¬°ü¼º ¾ø´Â °³º° Æ®·£½ºÆ÷Æ® ¿¬°á, ÀÀ¿ë µ¥ÀÌÅÍ ½ºÆ®¸²¿¡´Â »õ·Î¿î Ç÷Π·¹À̺íÀ» ÇÒ´çÇØ ÁÖ°í, ºÎÇÏ ºÐ»êÀ» À§ÇØ Ç÷Π·¹ÀÌºí °ªÀÌ ±ÕµîÇÏ°Ô ºÐÆ÷µÇµµ·Ï ÇÏ´Â ÃÖ¼Ò ¿ä±¸ »çÇ×À» Á¤ÀÇÇÑ´Ù. ¶ÇÇÑ »óÅ ºñº¸Á¸Çü ½Ã³ª¸®¿À¸¦ À§ÇØ Ç÷Π·¹ÀÌºí °ªÀ» Ãâ¹ßÁö ³ëµå¿¡ ÃÖ¼Ò·Î ÀúÀåÇϵµ·Ï ÇÏ´Â ¹æ¹ýÀ» ±Ç°íÇÑ´Ù. ¿¹¸¦ µé¾î, IP ÆÐŶÀÇ 5-Æ©ÇÃ(tuple) °ªÀ¸·ÎºÎÅÍ 20 ºñÆ® Çؽ¬ °ªÀ» »ý¼ºÇؼ­ Ç÷Π·¹ÀÌºí °ªÀ¸·Î »ç¿ëÇÒ ¼ö ÀÖ´Ù. Ç÷Π·¹À̺íÀ» ¼³Á¤ÇÏ´Â ³ëµå´Â Ç÷Π»óÅ ¼³Á¤¿¡ °ü¿©Çϸç, ƯÁ¤ Ç÷ο¡ ´ëÇØ Æ¯Á¤ 󸮸¦ Çϵµ·Ï ½Ã±×³Î¸µÀ» ÇÑ´Ù. ÀÌ °æ¿ì »óÅ ºñº¸Á¸Çü ½Ã³ª¸®¿À¿¡ ÀÖ´Â ³ëµåµéÀÌ ¿µÇâÀ» ¹ÞÁö ¾Êµµ·Ï ÇØ¾ß ÇÑ´Ù.
¿µ¹®³»¿ë¿ä¾à The 20-bit Flow Label field in the IPv6 header is used to label packets of a flow. A Flow Label of zero is used to indicate packets that have not been labeled and, once set to a non-zero value, the Flow Label is expected to be delivered unchanged to the destination node(s) except for compelling operational security reasons. The minimum requirements for the stateless scenario are defined. Source nodes SHOULD assign each unrelated transport connection and application data stream to a new flow to enable Flow-Label-based classification, and flow label values should be uniformly distributed to assist load distribution. Also, for the stateless scenario, the method that keeps minimal local state at the source node to record the flow label is recommended. For example, a 20-bit hash of values from the IP packet's 5-tuple can be used as a Flow Label value. A node that sets the flow label MAY also take part in a flow state establishment method, resulting in a signal to assign specific treatments to specific flows. Any such method MUST NOT disturb nodes taking part in the stateless scenario.
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°ü·ÃÆÄÀÏ TTAE.IF-RFC6437_[1].pdf TTAE.IF-RFC6437_[1].pdf            

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