Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010, Руководство по настройке

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Figure 3: Color-Blind RED Drop Profile with Colorless Queue Profile
In the following example, the drop profile and queue profile combine to specify the
following:
■
When the average queue length is between 30 percent full (30 KB) and 90 percent
full (90 KB), up to 5 percent of the packets are randomly dropped regardless of
their color.
■
When the average queue length is greater than 90 percent, all packets are dropped
regardless of color.
host1(config)# drop-profile nocolor
host1(config-drop-profile)# c ommitted-threshold percent 30 90 5
host1(config-drop-profile)# exit
host1(config)# queue-profile colorless
host1(config-queue)# committed-length 100000 100000
host1(config-queue)# conformed-fraction 100
host1(config-queue)# exceeded-fraction 100
To achieve the same drop treatment for each color, you can specify color-blind RED
in combination with a color-sensitive queue profile, as shown in Figure 4 on page 30.
Figure 4: Color-Blind RED Drop Profile with Color-Sensitive Queue Profile
In the following example, the drop profile and queue profile combine to specify the
following:
■
When the average queue length is between 30 percent full (30 KB) and 90 percent
full (90 KB), up to 5 percent of the packets are dropped randomly. In this case,
the maximum queue length is 100 KB for green packets, 50 KB for yellow packets,
and 25 KB for red packets. Therefore, the router randomly drops:
■
Red packets when the average queue length is between 7.5 KB and 22.5 KB
■
Yellow packets when the average queue length is between 15 KB and 45 KB
■
Green packets when the average queue length is between 30 KB and 90 KB
■
When the average queue length is greater than 90 percent of the maximum
queue length, all packets are dropped. Therefore, the router drops:
■
Red packets when the average queue length is greater than 22.5 KB
30 ■
Example: Configuring Color-Blind RED
JUNOSe 11.1.x Quality of Service Configuration Guide