[cisco-voip] Cisco phones shipping with bad manufacturing loadthatcan't DHCP right

[Ryan Ratliff]

Have you gotten a sniffer capture of this by any chance?

There was an old bug where the phone could receive DHCP responses on  
the data vlan but this only occurred if you had a DHCP server that  
would respond to the voice vlan dhcp request on the data vlan.  Most  
of the time we saw this was when the switch port where the dhcp  
server was connected was in trunk mode.   The dhcp server's nic would  
drop the dot1q header and pass voice vlan data up the stack.

-Ryan

On Nov 14, 2007, at 3:31 PM, Randy Homyk wrote:

Did this happen to you on 3560 switches?  I just had a batch of 7940  
phones that this just happened to me also.


You are correct, the only work around is to register the phone the  
first time on the voice vlan.  After it registers for the first time  
it can be moved to a port that has  switchport access vlan XX  /  
switchport voice vlan XX


Randy Homyk

CCIE Voice #14584

mailto:  rhomyk at bellsouth.net

Phone: +786-269-5175

Fax: +305-258-9156

Mobile: 786-269-5175




-----Original Message-----
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip- 
bounces at puck.nether.net] On Behalf Of Jason Aarons (US)
Sent: Wednesday, November 14, 2007 3:17 PM
To: Erick Bergquist; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Cisco phones shipping with bad  
manufacturing loadthatcan't DHCP right


Do you have a bug id? I haven't seen this behavior with 7940s/7941,  
doesn't mean there isn't a problem, jI ust haven't seen this behavior.


From: cisco-voip-bounces at puck.nether.net on behalf of Erick Bergquist
Sent: Wed 11/14/2007 2:49 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Cisco phones shipping with bad manufacturing  
load thatcan't DHCP right

Anyone know why cisco phones still ship with a MFG phoneload that
can't DHCP on the voice VLAN correctly? The fix is to configure the
switchport in the voice vlan for data until it gets a firmware update.
  This issue has been around awhile.
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