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- çç£æ§ã®åäžïŒ ããžãã¹ã¯ãªãã£ã«ã«ãªã¢ããªã±ãŒã·ã§ã³ãåªå ããããšã§ãQoSã¯åŸæ¥å¡ã®çç£æ§ãç¶æããäœéãŸãã¯ä¿¡é Œæ§ã®äœããããã¯ãŒã¯ããã©ãŒãã³ã¹ã«ããäžæãåé¿ããã®ã«åœ¹ç«ã¡ãŸãã
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- ãªã¢ã«ã¿ã€ã ã¢ããªã±ãŒã·ã§ã³ã®ãµããŒãïŒ VoIPããããªäŒè°ãªã©ã®ãªã¢ã«ã¿ã€ã ã¢ããªã±ãŒã·ã§ã³ã¯ãç¹ã«é å»¶ããã±ããæå€±ã«ææã§ããQoSã¯ããããã®ã¢ããªã±ãŒã·ã§ã³ã广çã«æ©èœããããã«å¿ èŠãªãªãœãŒã¹ãåãåãããšãä¿èšŒããŸãã
- äºæ¥ç¶ç¶æ§ïŒ éèŠãªããžãã¹ã¢ããªã±ãŒã·ã§ã³ãåªå ããããšã§ãQoSã¯ãããã¯ãŒã¯ã®åæ¢ã茻茳ãçºçããå Žåã®äºæ¥ç¶ç¶æ§ã確ä¿ããã®ã«åœ¹ç«ã¡ãŸãã
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1. åé¡ãšããŒãã³ã°
QoSãå®è£ ããæåã®ã¹ãããã¯ããããã¯ãŒã¯ãã©ãã£ãã¯ããã®çš®é¡ãšéèŠæ§ã«åºã¥ããŠåé¡ããããšã§ããããã¯éåžžãæ¬¡ã®ãããªããŸããŸãªåºæºã䜿çšããŠè¡ãããŸãïŒ
- ã¢ããªã±ãŒã·ã§ã³ïŒ ãã©ãã£ãã¯ãçæããŠããã¢ããªã±ãŒã·ã§ã³ã«åºã¥ããŠãã©ãã£ãã¯ãèå¥ããŸãïŒäŸïŒVoIPããããªäŒè°ãé»åã¡ãŒã«ããŠã§ããã©ãŠãžã³ã°ïŒã
- éä¿¡å /å®å IPã¢ãã¬ã¹ïŒ éä¿¡å ãŸãã¯å®å IPã¢ãã¬ã¹ã«åºã¥ããŠãã©ãã£ãã¯ãåªå é äœä»ãããŸããããã¯ãç¹å®ã®ãµãŒããŒãéšéããã®ãã©ãã£ãã¯ãåªå ããã®ã«åœ¹ç«ã¡ãŸãã
- éä¿¡å /å®å ããŒãçªå·ïŒ éä¿¡å ãŸãã¯å®å ããŒãçªå·ã«åºã¥ããŠãã©ãã£ãã¯ãèå¥ããŸããããã¯ãç¹å®ã®ã¢ããªã±ãŒã·ã§ã³ããã®ãã©ãã£ãã¯ãåªå ããããã«ãã䜿çšãããŸãã
- ãããã³ã«ïŒ åºç€ãšãªããããã³ã«ïŒäŸïŒTCPãUDPãICMPïŒã«åºã¥ããŠãã©ãã£ãã¯ãåé¡ããŸãã
ãã©ãã£ãã¯ãåé¡ããããšãQoSèå¥åã§ããŒãã³ã°ããå¿ èŠããããŸããããã«ããããããã¯ãŒã¯ããã€ã¹ã¯ãã®ãã©ãã£ãã¯ãèªèããããã«å¿ããŠåªå é äœä»ãã§ããŸããäžè¬çãªããŒãã³ã°ã¡ã«ããºã ã«ã¯æ¬¡ã®ãã®ããããŸãïŒ
- Differentiated Services Code Point (DSCP)ïŒ DSCPã¯ããã±ããã®QoSåªå 床ã瀺ãããã«äœ¿çšãããIPããããŒå ã®8ããããã£ãŒã«ãã§ããIPãããã¯ãŒã¯ã«ãããQoSã§æãåºã䜿çšãããŠããããŒãã³ã°ã¡ã«ããºã ã§ãã
- Class of Service (CoS)ïŒ CoSã¯ãã€ãŒãµããããããã¯ãŒã¯å ã®ãã¬ãŒã ã®QoSåªå 床ã瀺ãããã«äœ¿çšããã802.1Q VLANã¿ã°å ã®3ããããã£ãŒã«ãã§ãã
äŸïŒ ããäŒæ¥ã¯ããã¹ãŠã®VoIPãã©ãã£ãã¯ãåé¡ããåªå çãªåŠçãä¿èšŒããããã«é«ãDSCPå€ïŒäŸïŒEF - Expedited ForwardingïŒã§ããŒãã³ã°ãããããããŸãããåæ§ã«ããããªäŒè°ã®ãã©ãã£ãã¯ã¯ãä¿èšŒããã垯åå¹ ã¬ãã«ãæäŸããããã«DSCPå€AF41ïŒAssured ForwardingïŒã§ããŒãã³ã°ããããããããŸããã
2. 茻茳管ç
茻茳管çæè¡ã¯ã茻茳æéäžã®ãããã¯ãŒã¯ãã©ãã£ãã¯ã管çããããã«äœ¿çšãããŸãããããã®æè¡ã¯ããã±ããæå€±ãé²ããé«åªå 床ã®ãã©ãã£ãã¯ãäœåªå 床ã®ãã©ãã£ãã¯ã«ãã£ãŠæªåœ±é¿ãåããªãããã«ããããšãç®çãšããŠããŸãã
- ãã¥ãŒã€ã³ã°ïŒ ãã¥ãŒã€ã³ã°ã¯ãåªå 床ã«åºã¥ããŠãã±ããããã¥ãŒã«ãããã¡ãªã³ã°ããããšãå«ã¿ãŸãããã±ãããåªå é äœä»ãããããã«ã次ã®ãããªããŸããŸãªãã¥ãŒã€ã³ã°ã¢ã«ãŽãªãºã ã䜿çšã§ããŸãïŒ
- First-In, First-Out (FIFO)ïŒ æãåçŽãªãã¥ãŒã€ã³ã°ã¢ã«ãŽãªãºã ã§ããã±ããã¯åä¿¡ãããé åºã§åŠçãããŸãã
- Priority Queuing (PQ)ïŒ ãã±ããã¯ç°ãªãåªå 床ãã¥ãŒã«é 眮ãããåžžã«æãé«ãåªå 床ã®ãã¥ãŒãæåã«åŠçãããŸãã
- Weighted Fair Queuing (WFQ)ïŒ åãã©ãã£ãã¯ãããŒã«ã¯éã¿ãå²ãåœãŠããããã±ããã¯ãã®éã¿ã«åºã¥ããŠåŠçãããŸããããã«ããããã¹ãŠã®ãã©ãã£ãã¯ãããŒãå ¬å¹³ãªåž¯åå¹ ã®ã·ã§ã¢ãåãåãããšãä¿èšŒãããŸãã
- Low Latency Queuing (LLQ)ïŒ PQãšWFQã®çµã¿åããã§ãé«åªå 床ã®ãã©ãã£ãã¯ã¯åªå ãã¥ãŒã«ãäœåªå 床ã®ãã©ãã£ãã¯ã¯WFQãã¥ãŒã«é 眮ãããŸããããã¯ãVoIPããããªäŒè°ã®ãã©ãã£ãã¯ã«ãã䜿çšãããŸãã
- Weighted Random Early Detection (WRED)ïŒ WREDã¯ãåªå 床ãšèŒ»èŒ³ã®ã¬ãã«ã«åºã¥ããŠãã±ãããéžæçã«ãããããã茻茳åé¿æè¡ã§ããããã«ããããããã¯ãŒã¯ã®èŒ»èŒ³ãé²ããé«åªå 床ã®ãã©ãã£ãã¯ãããããããã«ãããªããŸãã
äŸïŒ ãããã¯ãŒã¯ç®¡çè ã¯ãVoIPãã©ãã£ãã¯ãåªå ããããã«LLQãå®è£ ãããããããŸãããVoIPãã±ããã¯é«åªå 床ãã¥ãŒã«é 眮ãããä»ã®ãã©ãã£ãã¯ã¯WFQãã¥ãŒã«é 眮ãããŸããããã«ãããVoIPãã©ãã£ãã¯ãåžžã«æåã«åŠçãããé å»¶ãšãžãã¿ãŒãæå°éã«æããããŸãã
3. 茻茳åé¿
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- ãã©ãã£ãã¯ã·ã§ãŒãã³ã°ïŒ ãã©ãã£ãã¯ã·ã§ãŒãã³ã°ã¯ããããã¯ãŒã¯ã«éä¿¡ããããã©ãã£ãã¯ã®ã¬ãŒããå¶åŸ¡ããããšãå«ã¿ãŸããããã¯ããã©ãã£ãã¯ã®ããŒã¹ããå¹³æ»åãããããã¯ãŒã¯ã®èŒ»èŒ³ãé²ãããã«äœ¿çšã§ããŸãã
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4. ãªãœãŒã¹äºçŽ
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