[cisco-voip] problem with phone getting DHCP address fromvoicevlan

[Lelio Fulgenzi]

This was definately one of my thoughts, however, if this was the case, then 
removing the data VLAN on the port I was working wouldn't have fixed the 
problem I'm guessing.

----- Original Message ----- 
From: "Justin Steinberg" <jsteinberg at gmail.com>
To: <lelio at uiguelph.ca>
Cc: <cisco-voip at puck.nether.net>
Sent: Wednesday, August 22, 2007 4:38 PM
Subject: Re: [cisco-voip] problem with phone getting DHCP address 
fromvoicevlan


> 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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