[cisco-voip] Simple VOIP question: Switch related

[Jorge L. Rodriguez Aguila]

Is this a 3560 switch? I have seen this behavior several times and have yet to find a solution, the most stressing issue is you put another phone( 7960/40 etc) on that port and it works.


Jorge Rodríguez Aguila
CCNA,CCVP,CRMCS,CIPCES
Senior Voice/Data Network Consultant
Netxar Technologies
jorge.rodriguez at netxar.com
Office 787-765-0058
PCS 787-688-8530
[cid:image001.png at 01C8EC21.16DA99C0]



From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of James Buchanan
Sent: Tuesday, July 22, 2008 2:11 PM
To: Matthew Linsemier; Jeff Cartier; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Simple VOIP question: Switch related

Do a  show vlan and make sure vlan 2 exists.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Matthew Linsemier
Sent: Tuesday, July 22, 2008 12:57 PM
To: Jeff Cartier; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Simple VOIP question: Switch related

Do you have CDP enabled on the switch?  Cisco phones use CDP voice vlan functionality.

Matt


On 7/22/08 1:00 PM, "Jeff Cartier" <jcartier at acs.on.ca> wrote:

I'm having the worst time trying to figure out a problem.

The issue is that a 7912 phone seems to be getting an IP address in the data subnet.  We've tried two configurations on the switchport level and neither are working...

Interface fa0/1
switchport mode access
switchport voice vlan 2
srr-queue bandwidth share 10 10 60 20
priority-queue out
mls qos trust cos
auto qos voip trust
spanning-tree portfast

AND/OR

Interface fa0/1
Switchport mode trunk
switchport trunk encapsulation dot1q
switchport voice vlan 2
srr-queue bandwidth share 10 10 60 20
priority-queue out
mls qos trust cos
auto qos voip trust
spanning-tree portfast

And yet the phone keeps receiving an IP address in the data subnet.

We've verified the following:
- helper-address on the router
- correct DHCP scope


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