From: shiran guez (shiranp3@gmail.com)
Date: Tue Nov 20 2007 - 04:35:54 ART
in the past to send on the same port different voice vlan and data vlan you
would need to create a trunk as you normally would if you want to send 2 or
more vlan's traffic, but due to the logic that it is not realy realistic to
do trunking the entire switch just to pass 2 vlan's (one for the IP Phone
and One for PC) then they created the "voice vlan" that coexists with the
"Data Vlan"
the dot1p are 3 bits part of the dot1q TCI (Tag Control Information) also
called as CoS (Class Of Service) like there is IPP (IP Precedence).
the message you get just mean that the voice traffic is set as the Native
Vlan and the Data is what you specified in the sw acc vlan <?>
On Nov 20, 2007 9:14 AM, Jonny English <redkidneybeans@gmail.com> wrote:
> Hi,
>
> I was reading the DocCD and came upon this command switchport voice vlan
> dot1p.
>
> This is what the docCD says for sending traffic with a
> "dot1p Configure the phone to use IEEE 802.1p priority tagging for
> voice traffic and to use the default native VLAN (VLAN 0) to carry all
> traffic. By default, the Cisco IP Phone forwards the voice traffic with an
> IEEE 802.1p priority of 5."
>
> So this means that when switchport voice vlan dot1p is uses 802.1p
> priority tagging for voice traffic and vlan 0 is used to carry all
> other traffic.
>
> but when I tried to configure this I got the following output.
>
> SW(config-if)#sw voice vlan dot1p
> % Voice VLAN does not exist. Creating vlan 0
> Rack1SW1(config-if)#
> 00:18:45: %PM-2-VLAN_ADD: Failed to add VLAN 0 - VLAN not found.
>
> My question is how does the switch know about vlan 0?
>
> Thanks,
> J
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:30 ART