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Mapping PLP to RED Drop Profiles

date_range 26-Sep-24

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Loss priority settings help determine which packets are dropped from the network during periods of congestion. The software supports multiple packet loss priority (PLP) designations: low and high. (In addition, medium-low and medium-high PLPs are supported when you configure tricolor marking.) You can set PLP by configuring a behavior aggregate or multifield classifier.

A drop-profile map examines the loss priority setting of an outgoing packet: high, medium-high, medium-low, low, or any.

Obviously, low, medium-low, medium-high, and high are relative terms, which by themselves have no meaning. Drop profiles define the meanings of the loss priorities. In the following example, the low-drop drop profile defines the meaning of low PLP as a 10 percent drop probability when the fill level is 75 percent and a 40 percent drop probability when the fill level is 95 percent. The high-drop drop profile defines the meaning of high PLP as a 50 percent drop probability when the fill level is 25 percent and a 90 percent drop probability when the fill level is 50 percent.

The following example procedure, configures a scheduler that includes two drop-profile maps, which specify that packets are evaluated by the low-drop drop profile if they have a low loss priority and are from any protocol. Packets are evaluated by the high-drop drop profile if they have a high loss priority and are from any protocol.

Create the low drop profile.

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[edit]
user@host# edit class-of-service drop-profiles low-drop

Specify values for interpolating the relationship between the queue fill level and drop probability for the low drop profile.

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[edit class-of-service drop-profiles low-drop]
user@host# edit interpolate 
user@host# set drop-probability [10 40]
user@host# set fill-level [75 95]

Crate the high drop profile.

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[edit class-of-service drop-profiles]
user@host# edit high-drop

Specify values for interpolating the relationship between the queue fill level and drop probability for the high drop profile.

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[edit class-of-service drop-profiles high-drop]
user@host# edit interpolate 
user@host# set drop-probability [50 90]
user@host# set fill-level [25 50]

Specify the scheduler name.

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[edit class-of-service]
user@host# edit schedulers best effort

Define the loss-priority for each low drop profile.

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[edit class-of-service schedulers best-effort]
user@host# set drop-profile-map loss-priority low protocol any drop-profile low-drop

Define the loss-priority for each high drop profile.

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[edit class-of-service schedulers best-effort]
user@host# set drop-profile-map loss-priority high protocol any drop-profile high-drop

Verify your configuration.

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[edit class-of-service]
user@host# show

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drop-profiles {
    low-drop {
        interpolate {
            fill-level [ 75 95 ];
            drop-probability [ 10 40 ];
        }
    }
    high-drop {
        interpolate {
            fill-level [ 25 50 ];
            drop-probability [ 50 90 ];
        }
    }
}

schedulers {
    best-effort {
        drop-profile-map loss-priority low protocol any drop-profile low-drop;
        drop-profile-map loss-priority high protocol any drop-profile high-drop;
    }
}

Save your configuration.
```
[edit class-of-service]
user@host# commit
```

arrow_backward PREVIOUS Managing Congestion by Setting Packet Loss Priority for Different Traffic Flows

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Class of Service User Guide (Routers and EX9200 Switches)

Mapping PLP to RED Drop Profiles

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Class of Service User Guide (Routers and EX9200 Switches)

Mapping PLP to RED Drop Profiles

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