Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

Mapping PLP to RED Drop Profiles

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.

  1. Create the low drop profile.
  2. Specify values for interpolating the relationship between the queue fill level and drop probability for the low drop profile.
  3. Crate the high drop profile.
  4. Specify values for interpolating the relationship between the queue fill level and drop probability for the high drop profile.
  5. Specify the scheduler name.
  6. Define the loss-priority for each low drop profile.
  7. Define the loss-priority for each high drop profile.
  8. Verify your configuration.
  9. Save your configuration.