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Configuring Linear RED Profiles

Linear random early detection (RED) profiles define CoS virtual circuit drop profiles. You can configure up to 32 linear RED profiles per port. When a packet arrives, RED checks the queue fill level. If the fill level corresponds to a nonzero drop probability, the RED algorithm determines whether to drop the arriving packet.

To configure linear RED profiles, include the linear-red-profiles statement at the [edit interfaces at-fpc/pic/port atm-options] hierarchy level:



[edit interfaces at-fpc/pic/port atm-options]

linear-red-profiles profile-name {

high-plp-max-threshold percent;

low-plp-max-threshold percent;

queue-depth cells high-plp-threshold percent low-plp-threshold percent;
}

The queue-depth, high-plp-threshold, and low-plp-threshold statements are mandatory.

You can define the following options for each RED profile:

high-plp-max-threshold—Define the drop profile fill-level for the high packet loss priority (PLP) CoS VC. When the fill level exceeds the defined percentage, all packets with high PLP are dropped.
low-plp-max-threshold—Define the drop profile fill-level for the low PLP CoS VC. When the fill level exceeds the defined percentage, all packets with low PLP are dropped.
queue-depth—Define maximum queue depth in the CoS VC drop profile. Packets are always dropped beyond the defined maximum. The range you can configure is from 1 through 64,000 cells.
high-plp-threshold—Define CoS VC drop profile fill-level percentage when linear RED is applied to cells with high PLP. When the fill level exceeds the defined percentage, packets with high PLP are randomly dropped by RED.
low-plp-threshold—Define CoS VC drop profile fill-level percentage when linear RED is applied to cells with low PLP. When the fill level exceeds the defined percentage, packets with low PLP are randomly dropped by RED.

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