Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Configuration Manual

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The most liberal case heavily reduces VOQL and changes of rate, leading to a shared
shaper that quickly converges. The conservative configuration overreacts to VOQL
and the change of rate, and converges very slowly.
Figure 25 on page 96 shows a graph of the dynamic rate when the video flow starts.
Figure 25: Dynamic Rate When Video Flow Starts
Stopping Video Flow
Table 10 on page 96 lists the dynamic rate as the video flow stops for the five classes
of simple shared shaper controls. Results might vary because the amount of video
measured in the first falling period is random, in the range 0–4 Mbps non-inclusive.
Table 10: Data When Video Flow Stops
Period of Dynamic Rate, in Kbps
10 9 8 7 6 5 4 3 2 1 Control
15000 15000 15000 15000 15000 15000 15000 15000 12132 11000 Most
liberal
15000 14999 14999 14996 14986 14946 14786 14146 11584 11000 Liberal
14987 14974 14948 14897 14795 14591 14182 13364 11728 11000 Moderate
14701 14503 14337 14116 13822 13429 12906 12208 11278 10955 Conservative
– – – – – – – – – – Most
conservative
Figure 26 on page 97 shows a graph of the dynamic rate when the video flow stops.
96 ■
Sample Process for Controlling the Simple Shared Shaper Algorithm
JUNOSe 11.1.x Quality of Service Configuration Guide