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Can I enabled Weighted Random Early Detection (WRED) and Low Latency Queueing (LLQ), or Class Based Weighted Fair Queueing (CBWFQ) at the same time?

April 26, 2017detection early enabled latency llq low queueing weighted wred

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Can I enabled Weighted Random Early Detection (WRED) and Low Latency Queueing (LLQ), or Class Based Weighted Fair Queueing (CBWFQ) at the same time?

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A. Yes. Queueing defines the order of packets leaving a queue. This means, it defines a packet-scheduling mechanism. It also can be used to provide fair bandwidth allocation and minimum bandwidth guarantees. In contrast, Request for Comments (RFC) 2475 defines dropping as the “process of discarding packets based on specified rules.” The default drop mechanism is tail drop, in which the interface drops packets when the queue is full. An alternative drop mechanism is Random Early Detection (RED) and Cisco’s WRED, which begins dropping packets randomly before the queue is full and seeks to maintain a consistent average queue depth. WRED uses the IP precedence value of packets to make a differentiated drop decision. For more information, refer to Weighted Random Early Detection (WRED).