From: Vincent Mashburn (vmashburn@fedex.com)
Date: Wed Mar 22 2006 - 11:33:39 GMT-3
If you are using Avaya Phones, then you can't use cdp. Trunking is your
only option.
Vince Mashburn
Voice / Data Engineer
901-263-5072
Cisco IP Telephony Support Specialist
CCNP, CCDA,Network +
-----Original Message-----
From: James Ventre [mailto:messageboard@ventrefamily.com]
Sent: Wednesday, March 22, 2006 8:09 AM
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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