From: Troy Levin (troylevin@hotmail.com)
Date: Wed Jun 14 2006 - 11:53:19 ART
Hi Sami,
I'd say there is not a right or wrong way to configure a port to support
Voice and Data vlan separation, but multiple solutions to achieve the same
goal. Your going to have to make a choice based on the wording and
interpretation of the question.
The example you give from InternetworkExpert obviously works and is probably
the most widely deployed configuration when a Cisco IPT phone is attached (
at least in my experience ). This is because it allows you to still utilize
other features on the port such as 802.1x, portfast, etc. You not need to
explicitly define the port as trunk because the voice vlan command with make
the port a pseudo trunk and also instruct the phone to be in the correct
voice vlan.
However, you might find that with a non-cisco IPT phone another
configuration is needed because the phone will not understand CDP messages
from the switch nor work with the port being a pseudo trunk. In this case
you will need to explicitly configure the port for trunk and also a native
vlan for data. Some non-cisco vendors (ie Avaya) will work ok with voice
vlan. Others may require the port to be explicitly defined as a trunk.
-Troy
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Sami
Sent: Wednesday, June 14, 2006 4:07 AM
To: ccielab@groupstudy.com
Subject: Voice VLAN
Group,
Voice VLAN story is really giving me hard time. We have so many experts on
this list , can't somebody explain what is the right way of configuring
Voice VLAN. I read three different workbooks CCO doc site and each has
their own solution.
This one from InternetworkExpert,
interface FastEthernet0/7
switchport access vlan 7
switchport voice vlan 10
switchport priority extend cos 1
mls qos trust cos
these guys say since 3550 port is in dynamic mode , switch automatically
form a trunk with Cisco Phone and don't require to configure port as a trunk
or access mode and no spanning tree portfast.....
I know in real life things work in a diffrent way , could some one please
calrify which way Cisco expect us to configure Voice VLAN stuff in lab so we
don't loose point in tussel of Trunk /Access/Advanced CDP/portfast
etc...stuff.
Many thanks !!
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