Wred is a congestion avoidance mechanism.
It drop packed before queue :
the mechanism is :
when a packet arrive, the router calculate the avg precedence's queue :
- if avg is less than min the packet is queueed
- if avg is greater than minimum but less than maximum, the packet
is queued or dropped depending of probability (by exemple 1/100)
- if avg is greater than maximum the packet is dropped
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