From: Alan Ewer (acewer64@gmail.com)
Date: Mon Jun 25 2007 - 00:00:28 ART
Aaaaaahhhhhh... I read the doco (quite a few times)...but didnt quite
understand what happened with data on vlan 0..
Many thanks for clearing that up !
Regds
AlanE
Oz
On 6/25/07, Scott Morris <smorris@ipexpert.com> wrote:
>
> 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!
>
> smorris@ipexpert.com
>
> 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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