[cisco-voip] problem with phone getting DHCP address from voicevlan

[Justin Steinberg]

lelio.

make sure that whatever server is the DHCP server for your DATA vlan
does not have the command below applied to the switchport:

 switchport voice vlan 3104

If the data DHCP server has this command it may be incorrectly
responding to DHCP broadcasts.  Some NIC's in some servers don't work
properly with dot1q tags and may respond to the request.

Justin

On 8/22/07, Ellington, Chris <Chris.Ellington at inin.com> wrote:
> With your setup, you would initially tell the switch to use untagged
> packets and vlan 1220 (I'm assuming this is your data vlan).  When you
> drop that, my _guess_ is that the voice vlan takes over but I don't have
> a switch and a phone handy to test.
>
> The switch voice vlan command is only useful if you are using dot1q
> trunks -or- if you are going to use dot1p for CoS purposes.  Here's a
> good link on it
> http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/relea
> se/12.1_12c_ea1/configuration/guide/swvoip.html
>
> chris
>
>
> Message: 2
> Date: Wed, 22 Aug 2007 10:20:17 -0400
> From: "Lelio Fulgenzi" <lelio at uoguelph.ca>
> Subject: [cisco-voip] problem with phone getting DHCP address from
>         voicevlan
> To: "Cisco VoIPoE List" <cisco-voip at puck.nether.net>
> Message-ID: <009601c7e4c7$902be890$56196883 at cfs.uoguelph.ca>
> Content-Type: text/plain; charset="iso-8859-1"
>
> We have a number of new phones with a problem whereby they get a DHCP
> address from the data VLAN not the voice VLAN. The only way to make it
> work is to remove the data VLAN, let the phone upgrade and then
> everything works after replacing the data VLAN even after erasing the
> phone configuration.
>
> Here's the specific phone load information:
>
> App Load ID: P003030IMFG2
> Boot Load ID PC0303010200
> Version: 3.1 (MF.G2)
>
> Here's my switch config:
>
> interface FastEthernet1/0/40
>  switchport access vlan 1220                  *this is what I remove to
> make things work*
>  switchport mode access
>  switchport voice vlan 3104
>  srr-queue bandwidth share 10 10 60 20
>  srr-queue bandwidth shape  10  0  0  0
>  mls qos trust device cisco-phone
>  mls qos trust cos
>  auto qos voip cisco-phone
>  spanning-tree portfast
> end
>
> ------------------------------------------------------------------------
> --------
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo."
> WJR
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