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Implementing Cisco Networking Solutions by Harpreet Singh

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Low latency queueing (LLQ)

LLQ is also known as Priority Queueing (PQ). LLQ allows delay-sensitive data such as voice to be de-queued and sent before packets in other queues are de-queued. In this queuing, all packets from the priority queue are transmitted on the link as soon as they arrive in the queue. The PQ is emptied before the other queues can be served. The gold-class packets in the preceding figure were transmitted ahead of any other packets, illustrating the PQ.

This ensures that the time-sensitive packets do not suffer delays, or variable delays (jitter) by waiting in the output queues. PQ is used for voice traffic as it is the most time sensitive traffic on the network. Note that if too much traffic comes into the PQ, it can starve ...

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