From: Scott Morris (smorris@ipexpert.com)
Date: Mon Jun 25 2007 - 09:56:34 ART
In order to do dot1p, you need to ACTUALLY tag things (dot1p is part of the
802.1Q field set). So if you are running voice in an untagged scenario like
that, the answer is no, it will not be effective.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: dampened taker [mailto:cheechew@hotmail.com]
Sent: Sunday, June 24, 2007 11:36 PM
To: smorris@ipexpert.com
Cc: ccielab@groupstudy.com
Subject: RE: Voice Vlan 0 - DOT1P
When i configure dot1p, it always prompt out this message. Will dot1p
effective on the interface with this error message?
%PM-2-VLAN_ADD: Failed to add VLAN 0 - VLAN not found.
Scott, but according to docCD, the switchport should be access port with
voice vlan connecting to phone. Are you able to comment that?
"Scott Morris" <smorris@ipexpert.com>
Sent by: nobody@groupstudy.com
06/25/2007 09:59 AM
Please respond to
"Scott Morris" <smorris@ipexpert.com>
To
"'Alan Ewer'" <acewer64@gmail.com>, "'Cisco certification'"
<ccielab@groupstudy.com>
cc
Subject
RE: Voice Vlan 0 - DOT1P
If you search Cisco's website (or Google) you'll find lots of references
for
VLAN 0 in regards to Voice VLANs. Basically, this is a designation for
untagged frames, which means whatever your trunk's native VLAN is set to
in
the dot1q trunk to an IP phone, that's what VLAN 0 represents.
That'll also mean it's the same VLAN as your PC's data behind the phone,
and
I'll tell you that's generally not a good idea in deployments. But this
is
all about the lab. :)
So how about changing your voice vlan to something other than the default
command set!
To an IP phone, you SHOULD be trunking. The general spec is voice is
tagged
(dot1q), PC data is untagged (access vlan AKA your trunk's native vlan,
untagged).
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Alan
Ewer
Sent: Sunday, June 24, 2007 8:36 PM
To: Cisco certification
Subject: Voice Vlan 0 - DOT1P
Hi all...
sorry if this has been answered before.....
I am playing around with voice vlans on 3550's
When I invoke the "switch voice vlan dot1p" command I get a message
referring to the voice VLAN being VLAN0, yet i cannot create/see VLAN 0
So where is this mystical VLAN ? How do I use it and why is the voice
traffic there ?? I would have thought that i would put it on the default
native vlan for the interface (usually vlan 1) .....as usual the Cisco
doco
is unhelpful..and to some extent confusing (to me at least)...
Also if voice vlan is 0 and access vlan is 1, doesnt this imply that the
port is also trunking ??
any explanation gratefully accepted..
Regds
AlanE
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