in order to correctly support VoIP traffic you would need a scheduler using LLQ.
to be noticed that the qos trust cos should already be doing the job of the service-policy:
in input it trusts the L2 CoS values
internally the L2 CoS are mapped to DSCP values
the service-policy does this by using input DSCP and use it to create the internal DSCP.
in the outgoing interface queueing should be done based on the internal DSCP tag after it is mapped again to a CoS.
Strict Priority / Low Latency Queueing
You can configure transmit queue 3 on each port with higher priority using the priority high tx-queue configuration command in the interface configuration mode. When transmit queue 3 is configured with higher priority, packets in transmit queue 3 are scheduled ahead of packets in other queues.
When transmit queue 3 is configured at a higher priority, the packets are scheduled for transmission before the other transmit queues only if it has not met the allocated bandwidth sharing configuration. Any traffic that exceeds the configured shape rate is queued and transmitted at the configured rate. If the burst of traffic, exceeds the size of the queue, packets are dropped to maintain transmission at the configured shape rate.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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