Neither WFQ nor CBWFQ can provide guaranteed bandwidth and low-delay guarantee to selected applications such as VoIP; that is because those queuing models have no priority queue. Certain applications such as VoIP have a small end-to-end delay budget and little tolerance to jitter (delay variation among packets of a flow). LLQ includes a strict-priority queue […]
Congestion avoidance is used to avoid tail drop, which has several drawbacks. RED and its variations, namely WRED and CBWRED, are commonly used congestion-avoidance techniques used on Cisco router interfaces. Congestion avoidance is one of the main pieces of a QoS solution. Tail Drop and Its Limitations When the hardware queue (transmit queue, TxQ) is […]