12-13-2013 08:29 AM - edited 03-07-2019 05:04 PM
I am having an issue where it appears that the "auto qos voip cisco-phone" command is marking down my voice packets COS and DSCP values to 0. Anyone else notice this? I am connecting Cisco 7945 phone to the interfaces with this command applied to the interface. I verified that the IP Phone is sending COS = 5 and DSCP = ef to the switchport. I verified the packets inbound to the switchport and the packets outbound as they transit to the destination IP Phone's switchport.
12-14-2013 11:25 AM
Hi joshua,
What is the IOS-XE version you are running on your 3850 ?
Post your switchport configuration (7945 phone connected)
Here is 3.3 QoS config guide & I noticed it says something like below qouted. So make sure this trust device command is there & your port is configured for standard VoIP port connectivity.(like voice vlan, etc)
"The trust device device_type interface configuration command is only supported in an auto-QoS configuration, and not as a stand-alone command on the switch. When using the trust device device_type interface configuration command in an auto-QoS configuration, if the connected peer device is not a corresponding device (defined as a device matching your trust policy), both CoS and DSCP values are set to "0" and any input policy will not take effect"
HTH
Rasika
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12-16-2013 06:18 AM
I am running 03.03.01SE.
Here is the config of a typical port:
interface GigabitEthernet1/0/1
switchport access vlan 100
switchport mode access
switchport voice vlan 1000
trust device cisco-phone
auto qos voip cisco-phone
spanning-tree portfast
service-policy input AutoQos-4.0-CiscoPhone-Input-Policy
service-policy output AutoQos-4.0-Output-Policy
It's as if the COS value of the phone is not being trusted on the ingress of the switchport.
12-16-2013 08:10 AM
I worked with Cisco TAC and this appears to be a new bug. The work around is to remove the "trust device cisco-phone" command under the interface.
12-16-2013 08:55 AM
Thanks for that info. If you get to know the bug-id please post it here for others benefit.
Rasika
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