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IP phone default QoS remarking

Hi,

One source I have read states that by default a Cisco IP phone will remark all PC frames to cos 0 and leave DSCP values; and another source claims the phone will rewrite cos and dscp values.

Does anybody have a definitive answer to this? Help!

Thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: IP phone default QoS remarking

Hi Steve

As for CoS, it will be re-marked to 0 if and only if the frames coming from the PC are tagged (i.e. a trunk)

If the frames are not tagged (i.e: not sent on a trunk), then they are forwarded toward the access switch un-tagged, and will be switched onto the native VLAN of the access switch's port.

HTH

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
1 REPLY
Cisco Employee

Re: IP phone default QoS remarking

Hi Steve

As for CoS, it will be re-marked to 0 if and only if the frames coming from the PC are tagged (i.e. a trunk)

If the frames are not tagged (i.e: not sent on a trunk), then they are forwarded toward the access switch un-tagged, and will be switched onto the native VLAN of the access switch's port.

HTH

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
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