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

[Ellington, Chris]

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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