[viraptor]

Ok, I don't understand this part then: "With RED the router will instead have some probability of dropping the packet based on the size of the queue, going up to 100% if the queue is full." - that seems to be universally true for any queue with limited capacity. If it's full, it's going to start dropping packets - whether it's those on the queue, or the new ones doesn't matter. Any queue which is full will require dropping as many packets as the number coming in.

Is there some reason this was described as a specific behaviour here?

[stock_toaster]

I believe the focus is more on the first part of that statement. A "standard" queue would only drop packets when it is in actuality full. RED drops packets when the queue is non-full based on some calculated probability. The likelihood of drop simply goes up until the queue is full (and 100% of new packets drop).

Apparently.