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Chapter 6
Meters, queues and IPQoS
E-NIT-CTC-20041213-0013 v0.5
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Resbytes
Hold
Markprob
The early discard strategy will calculate the drop probability based on the BLUE 
algorithm, which uses packet loss and link utilization history to manage congestion. 
BLUE maintains a single probability, which it uses to mark (or drop) packets when 
they are queued. If the queue is continually dropping packets due to buffer overflow, 
BLUE increments the marking probability, thus increasing the rate at which it sends 
back congestion notification. Conversely, if the queue becomes empty or if the link is 
idle, BLUE decreases its marking probability.
resbytes value
Description
number (0..64)
The reserved subqueue size in kilo bytes (KB).
This has the same function as the respackets 
parameter but uses size in kilo bytes instead of 
packets.
hold value
Description
number
The hold time in microseconds for early discard 
strategy.
markprob value 
Description
number (0..1000)
The maximum packet marking probability in parts per 
mille for early discard strategy.