From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Sat Jan 21 2006 - 18:31:22 GMT-3
Have a look at
http://www.cisco.com/en/US/tech/tk389/tk390/technologies_tech_note09186a00800
94665.shtml#topic2
Basically the 802.1p bits are 3 bits within the 802.1q header and represent
priority. By default these will be set to 5 in the voice vlan, but this
dot1p option is allowing you to set it to what you want.
On 1/21/06, CCIEin2006 <ciscocciein2006@gmail.com> wrote:
>
> When configuring voice vlans on the Catalyst 3550 switch, you are
> presented
> with the following options:
>
> Rack1SW2(config-if)#switchport voice vlan ?
> <1-4094> Vlan for voice traffic
> dot1p Priority tagged on PVID
> none Don't tell telephone about voice vlan
> untagged Untagged on PVID
>
> I am confused as to what the dot1p setting does. Does it tell the IP phone
> to send frames with 802.1q tagging?
>
> How does the dot1p setting compare to setting a vlan number?
>
> When setting the voice vlan to a number (say 10 for example) is that vlan
> 10
> number specified with a 802.1q tagged frame?
>
> Please explain.
>
> Thanks in advance!
>
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