Link Utilization util total bits sent total bits
網路鏈結使用率(Link Utilization) 半雙 頻寬分享方式 util% = total bits sent + total bits received bandwidth 全雙 序列鏈結 util% = Max (total bits sent , total bits received) bandwidth 或依流入、流出個別計算 2020/11/9 7
Example: T 1專線流量與使用率 假設某一網管應用針對某一網路設備之一T 1專線介 面(1. 544 Mbps)以每 5分鐘為一周期進行流量監測, 在 10: 00, 10: 05 a. m兩次監測所得之物件值: 10: 00 AM: if. In. Octets = 1, 500, 000 if. Out. Octets = 1, 200, 000 10: 05 AM: if. In. Octets = 2, 500, 000 if. Out. Octets = 7, 200, 000 2020/11/9 15
流量統計 流入: 2, 500, 000 - 1, 500, 000 = 1, 000 Bytes 1, 000 *8 / (60*5) = 26, 667 bps = 26. 7 Kbps 流出: 7, 200, 000 - 1, 200, 000 = 6, 000 Bytes 6, 000 *8 / (60*5) = 160, 000 bps = 160 Kbps 流量 (不分流入流出) 2020/11/9 Max (160, 26. 7) = 160 Kbps 16
使用率計算 �流入: � 2, 500, 000 - 1, 500, 000 = 1, 000 Bytes � 1, 000 8 / (1, 544, 000 60 5) = 1. 73 % �流出: � 7, 200, 000 - 1, 200, 000 = 6, 000 Bytes � 6, 000 8 / (1, 544, 000 60 5) = 10. 36 % �使用率 (不分流入流出) �Util% = Max (1. 73%, 10. 36%) = 10. 36% 2020/11/9 17
Jitter量測 (以PRTG為例) Jitter最大值: 3 ms 2020/11/9 21
Cisco IP SLAs示意圖 2020/11/9 23
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