From: Matt Mullen (mullenm@gmail.com)
Date: Thu Oct 13 2005 - 14:27:52 GMT-3
This brings up a question I have had for a while; what exactly does the
following command accomplish?
switchport voice vlan dot1p
The doc cd says this "The telephone uses priority tagging and uses VLAN 0
(the native VLAN). By default, the Cisco IP phone forwards the voice traffic
with an IEEE 802.1p priority of 5."
I'm not exactly clear on what this means. Under what circumstances would
you want to use this config?
Thanks,
Matt
On 10/13/05, Guyler, Rik <rguyler@shp-dayton.org> wrote:
>
> Stefan, you certainly can hardcode the port to be a trunk. By default it's
> set to dynamic desirable so if a Dot1Q-capable device is plugged in a
> trunk
> will form. Since you may not have only phones plugged into a single
> switch,
> this feature more or less keeps your port configs consistent across the
> switch but still be able to dynamically determine if it needs to trunk for
> a
> phone or be in access mode for a host device.
>
> Rik
>
> -----Original Message-----
> From: Stefan Grey [mailto:examplebrain@hotmail.com]
> Sent: Thursday, October 13, 2005 11:38 AM
> To: ccielab@groupstudy.com
> Subject: Voice VLANS
>
> Hello,
>
> While learning this I read that when a phone is connecte to the 3550
> switch
> it will automatically form an 802.1q trunk to the phone.
>
> interface fa0/1
> switchport voice vlan 2
> sw acc vlan 3
>
> Such a question appeared in my head... Would it be then ok to configure in
> such situation statical trunk configuration?? ... like
>
> int fa0/1
> sw trunk enc dot1q
> sw mode trunk
>
> If yes is that used in some particular situations in the real networks (or
> it is always automatically detected).
> And if yes wouldn't be it just mixing of commands of different switchport
> modes??
>
> sw trunk ..commands are the commands of the trunk mode of the port and sw
> acc command would be the access command of the switch.
>
> Thanks,
>
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