From: Carlos Chorao (cchorao@solvertech.co.nz)
Date: Mon Jun 12 2006 - 05:26:31 ART
Agree.
Carlos.Chorao.#11351.r/s
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
James Ventre
Sent: Thursday, 23 March 2006 2:09 a.m.
To: Vincent Mashburn
Cc: Vishal Patel; david robin; Cisco certification
Subject: Re: Voice vlan
> However, if you are not using Cisco Phones, > then you will have to
use 802.1q trunking as indicated in the previous > e-mails.
I have an Avaya VoIP implementation where I use the following:
switchport access vlan 227
switchport mode access
switchport voice vlan 209
If you don't tag any frames coming into the switch, it's in the access
vlan, the phone receives a special DHCP Option which tells it to jump
into VLAN 209 and re-dhcp (normal PC's igonre it). Using the voice vlan
and access commands together essentially make it a trunk with a native
and 1 tagged vlan.
You don't need to use CDP to utilize the simpler config of "voice vlan".
James
Vincent Mashburn wrote:
> You should be able to use access ports with "switchport mode access"
> to support both voice vlan and data vlan. This is due to CDP
enhancements.
> Bacisclly, the CDP packet includes both voice vlan and data vlan
> within each update packet. So, the phone knows that its vlan is in
> the voice vlan portion of the packet and the PC knows that its vlan is
> in the data vlan portion of the packet. However, if you are not using
> Cisco Phones, then you will have to use 802.1q trunking as indicated
> in the previous e-mails.
> Hope this helps
> Vince Mashburn
> Voice / Data Engineer
> 901-263-5072
> Cisco IP Telephony Support Specialist
> CCNP, CCDA,Network +
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