Until today I was sure that WRED is a Congestion Avoidance mechanism and
queues like WFQ are Congestion Management mechanism.

Now there is this article saying that WRED is Congestion Management
mechanism and Tail Drop is Congestion Avoidance mechanism .

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12112cea/3550scg/swqos.htm#95903

"Tail drop is the default congestion-avoidance technique on Gigabit-capable
Ethernet ports"

"the switch uses egress queues and WRR for congestion management"

Any Thoughts?


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