QoS Scheduler Policies
Quality of Service Guide 521
The reduced ability to determine the time of congestion if the reading interval is too long is
shown in Figure 30, Figure 31, and Figure 32. It can be seen that the same readings (in the 3
examples) can represent different congestion patterns that occur at different times between
the two consecutive reads. The congestion pattern, or the exact time of congestion cannot be
determined from the reading itself. The reading only indicates that the congestion occurred x
number of times between the two consecutive readings. In the example shown in Figure 30,
Figure 31, and Figure 32, an operator can decipher that the link was congested 20% of the
time during a one day period without being able to pinpoint the exact time of congestion
within the one day period. To determine the time of the congestion more accurately, the
operator must collect the information more frequently. For example, if the information is
collected every 30 minutes, then the operator can determine the part of the day during which
congestion occurred within 30 minutes of accuracy.
Figure 30: Determining the Time of Congestion (Example 1)
al_0743
Vport Offered
Load
Read
Samples above the threshold: 20K
Total samples: 100K
Read
1 Day
Time
Vport configured bandwidth [kbps]
Monitor-threshold [%]
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