本帖最後由 bubblestar 於 2010-9-8 10:09 編輯
回復 9# lttliang
實在太技術性了，要深入研究的話，真的是要慢慢學，正如 lttliang 兄所說，可能要等退休之後了 
AF 代表 Assured Forwarding 保証傳送。加上正確DSCP值，可保証使用一定數量的可使用頻寬傳送封包資料。又如下面所講，它可分金、銀、銅 用以確保50%、30%、20%頻寬傳送封包。太深入了，其實點樣做，我都不知道。
想起來，在我的Draytek Vigor Router，都有相類似的設定的，我都有做架，可能因為係咁樣，所以我的傳送一直都有一定程度的可靠性
Assured Forwarding (AF) defines classes by using DSCP values. AF is important in understanding how to relate DSCP AF terminology to DSCP values
AF has four AF classes, AF1x through AF4x, where the AF4 class is considered to have more importance than the AF1 class. Within each class, there are three drop probabilities. Depending on the policy of a given network, you can configure packets for a PHB based on required throughput, delay, jitter, loss, or according to priority of access to network services.
AF PHB defines a method by which traffic classes are given different forwarding assurances. A practical example of dividing a network into classes is as follows:
•Gold: 50 percent of the available bandwidth
•Silver: 30 percent of the available bandwidth
•Bronze: 20 percent of the available bandwidth
EF 代表 Expedited Forwarding 加速傳送。 通過適當設置，建立一條點對點而低丟失率、低延遲率、確實的頻寬，以確保兩點通話、通視頻、通文字的環境。
Expedited Forwarding defines the Expedited Forwarding (EF) PHB. Network devices use EF PHB to build a low-loss, low-latency, low-jitter, assured-bandwidth, end-to-end service through DiffServ domains. EF service appears to the endpoints as a point-to-point connection. An example is to apply EF PHBs to VoIP traffic. The remaining sections of this chapter explain the application of DSCP and DiffServ on Catalyst switches.
我仲未夠班係咁多位高手、前輩面前扮專家，都係留俾其他人解釋吧，能解決當前問題的話，我暫時都已經好心足了。 |
發表於 2010-9-7 16:29
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真系型仔 讲野都咁型
