11-03-2016 03:30 PM - edited 03-08-2019 08:02 AM
The 3650 QoS configuration guide I'm reading does not clearly state whether
auto qos cisco-phone
actually remarks non-conforming packets to dscp 0. For example, if I apply the above configuration to a port that a Cisco phone is not on, will it remark all packets as DSCP 0?
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11-04-2016 01:45 AM
I haven't tested it with non cisco phone using the cisco syntax usually it would be just trust voip instead if non Cisco, but looking at the below its not going to trust it through cdp if its not a Cisco phone so most likely it will be marked back to 0
cisco-phone—When you enter the auto qos voip cisco-phone interface configuration command on a port at the edge of a network that is connected to a Cisco IP Phone, the switch enables the conditional-trusted boundary feature. The switch uses the Cisco Discovery Protocol (CDP) to detect the presence or absence of a Cisco IP Phone. When a Cisco IP Phone is detected, the ingress classification on the interface is set to trust the CoS marking of the received packet. When a Cisco IP Phone is absent, the ingress classification is set to not trust the CoS (or DSCP) value of any packet.
11-04-2016 01:45 AM
I haven't tested it with non cisco phone using the cisco syntax usually it would be just trust voip instead if non Cisco, but looking at the below its not going to trust it through cdp if its not a Cisco phone so most likely it will be marked back to 0
cisco-phone—When you enter the auto qos voip cisco-phone interface configuration command on a port at the edge of a network that is connected to a Cisco IP Phone, the switch enables the conditional-trusted boundary feature. The switch uses the Cisco Discovery Protocol (CDP) to detect the presence or absence of a Cisco IP Phone. When a Cisco IP Phone is detected, the ingress classification on the interface is set to trust the CoS marking of the received packet. When a Cisco IP Phone is absent, the ingress classification is set to not trust the CoS (or DSCP) value of any packet.
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