From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Mon Nov 26 2007 - 09:22:22 ART
This command configures the telephone (typically cisco IP phone). It
tells the telephone to mark the "data" traffic for a PC connected to
the IP phone with this particular CoS value, in your case "0".
Otherwise the phone will mark the data traffic with the same CoS Value
as voice traffic.
without this command, preferential treatment of voice will be wrongly
given to data traffic when you simply enable the switch port to trust
Cos.
HTH,
Joseph.
On Nov 26, 2007 3:31 PM, CCIE <ccie@axizo.com> wrote:
> Dear Experts
>
>
>
> I found this command in several scenarios of the Cisco documentation? But I
> can't understand the logic why I would need the last command?
>
> Could anybody try to explain that to me?
>
>
>
> Mls qos
>
> Int f0/1
>
> Switchport access vlan 4
>
> Switchport voice vlan 40
>
> Mls qos trust cos
>
> Switchport priority extend cos 0 <== This command
>
>
>
>
>
> Why I would use the last command to re-tag the CoS of the data, especially
> it is an access port for the data VLAN (i.e. no tags will come to me with
> the data frames)
>
>
>
>
>
> Regards,
>
> Amin
>
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