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:
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.
