Weighted Random Early Detection (WRED)
Whereas queuing provides congestion management, mechanisms such as WRED provide congestion avoidance. Specifically, WRED can prevent an output queue from ever filling to capacity, which would result in packet loss for all incoming packets. This section examines the need for and the configuration of WRED on Cisco routers.
How TCP Handles Drops
Recall from your early studies of networking technology how Transport Control Protocol (TCP) windowing functions. A sender sends a single segment, and if the sender receives a successful acknowledgment from the receiver, it then sends two segments (that is, a “windows size” of 2). If those two segments were acknowledged successfully, the sender sends four segments, ...
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