voice config

Answered Question
Jun 30th, 2007

do i need both commands on interface to trust COS from cisco phone?

mls qos trust device cisco-phone

mls qos trust cos

or do i only need

mls qos trust device cisco-phone

I have this problem too.
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Correct Answer by mohammedmahmoud about 9 years 7 months ago

Hi,

"mls qos trust cos" configures the interface to trust the CoS or DSCP value for all Ethernet frames received.

"mls qos trust device cisco-phone" configures the interface to trust CoS values received only if a Cisco IP Phone is attached, note that in this case only the IP Phone traffic is trusted and not the traffic from PC connected to the IP Phone Switch port, accordingly the choice is yours.

HTH,

Mohammed Mahmoud.

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Correct Answer
mohammedmahmoud Sat, 06/30/2007 - 08:16

Hi,

"mls qos trust cos" configures the interface to trust the CoS or DSCP value for all Ethernet frames received.

"mls qos trust device cisco-phone" configures the interface to trust CoS values received only if a Cisco IP Phone is attached, note that in this case only the IP Phone traffic is trusted and not the traffic from PC connected to the IP Phone Switch port, accordingly the choice is yours.

HTH,

Mohammed Mahmoud.

roger-smith Sat, 06/30/2007 - 10:28

Thank you! I have seen conflicting configurations thanks for the answer.

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