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Beginner

QoS/802.1P question

Hi All,

I am trying to understand how cos marking works when connecting an IP Phone (Cisco/non-Cisco) to a 3560.

PC----IP phone----3560.

Both(PC and IP Phone) are marking frames with a certain cos value. Can we override the cos settings for frames coming from the PC and the IP Phone both ?

command 1: int gi0/1

command 2: mls qos cos 5

command 3: mls qos cos override

command 4: switchport priority extend cos 1

From the above config, will all the frames(PC and IP Phone) be marked with a cos of 5? If yes, how would configure the switch so that frames from the PC be marked with a cos of 1 and the frames from the IP Phone be marked with a cos of 5?

Thanks.

Regards,

Nilesh

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