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Can I re-classify Class of Service (CoS) value of data generated from a PC connected to an IP phone which is attached to the Catalyst 2900 XL and 3500 XL series switches?

April 26, 2017class connected COS Data IP pc service value

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Can I re-classify Class of Service (CoS) value of data generated from a PC connected to an IP phone which is attached to the Catalyst 2900 XL and 3500 XL series switches?

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A. Yes, you can configure the interface level switchport priority extend trust command. This feature instructs the first Cisco IP phone to trust the dot1p tag received from the phone or any device connected to it on the phone’s secondary port. This command needs to be used with caution. If the user connects a workstation which sets the tag to the IP phone, the data traffic from the user gets the user set priority. It has a negative impact on the quality of the voice.