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Implementing Cisco Networking Solutions by Harpreet Singh

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Weighted random early detection (WRED)

WRED is a modified version of RED where weights are assigned to multiple classes within the same queue. WRED provides separate thresholds and weights for different IP precedence, allowing the ability to provide different qualities of service in regard to packet dropping for different traffic types. Standard traffic may be dropped more frequently than premium traffic during periods of congestion.

Recall from the discussion on DSCP values that the assured forwarding class has multiple sublevels each with a different drop probability. For example, within the AF4 traffic class, AF43 has the highest drop probability, followed by AF42, and AF41 has the lowest drop probability. This is implemented by using ...

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