[e2e] Detect or avoid Congestion (by Bandwidth or Queue length)

[여엉]

Hi.

As far as I know,

RED and its varints use Queue length to prevent or detect congestion.

And

Virtual Queue or Adaptive Virtual Queue use Bandwidth. (Sum of Input Traffic
Rates/Output link rate, target utilization, etc...)

What is differnece between Queue length and Bandiwidth?

Is there any "fundamental " advantage or disadvantage in using queue length
for congestion detection? (
Implementation complexity? link utilization?)

Thx in advance

--
Young